[In]dune

[In]dune Saumil Nagar + Medha Bansal + Kai Yeh

[In]dune Saumil Nagar (M.Arch) Medha Bansal (M.Arch) Kai Yeh (M.Arch)

ARCHITECTURAL ASSOCIATION SCHOOL OF ARCHITECTURE GRADUATE SCHOOL PROGRAMMES

PROGRAMME: STUDENT NAMES:

DISSERTATION TITLE: COURSE TITLE: COURSE TUTORS:

DECLARATION:

Emergent Technologies & Design 2018-2020 Saumil Nagar ( M.Arch candidate) Medha Bansal ( M.Arch candidate ) Kai Yeh ( M.Arch candidate) In-dune M.Arch Dissertation Dr. Michael Weinstock, Dr. Elif Erdine, Dr. George Jeronimidis Alican Sungur, Antiopi Koronaki and Milad Showkatbakhsh “I certify that this piece of work is entirely my/our own and that any quotation or paraphrase from the published or unpublished work of others is duly acknowledged.”

SIGNATURE OF STUDENTS: (Saumil Nagar)

DATE:

10th January, 2020

(Medha Bansal)

(Kai Yeh)

Acknowledgement Team:

Saumil Nagar:

We would like express our deepest appreciation towards Dr. Michael Weinstock. We thank you for guiding and supporting us throughout the course. You empowered us with the tools needed to think more critically at each step of this project. Dr.Elif Erdine, we thank you for your valuable feedback and lessons. We are ever so grateful to you for sharing your wisdom with us.

I would like to extend my gratitude towards Mr. Krishnan .V , Mr. Parvez Charania, Mrs. Mridula Gudekar and Mr. Anju Gudekar for mentoring and always encouraging me to push my boundaries. Your advice in both professional and personal life has been invaluable.

We would also like to thank Dr. George Jeronimidis for helping us with the material and structural research in our dissertation.

We are grateful to our studio tutors Antiopi Koronaki, Milad Showkatbakhsh and Alican Sungur for all computational aid and feedback.

I am extremely grateful to my late grandfather for all that he did for us and for being someone that I could always look up to and rely on.

His work ethics and the values that he held has always motivated me to work harder and be better.

I would especially like to thank my family for all the sacrifices they made on my behalf. My grandparents for being so generous, loving and accommodating .My parents for understanding me, doing everything they could to support and guide me through all my difficulties and helping me get here today. My brother, for being my best friend and being so tolerant.

I would also like to thank Soumya for her continued love and affection.

It wouldn’t have been possible without your support.

Lastly I would like to thank all my friends and colleagues at home and at Emtech. I will always cherish the moments we spent together. In your own unique way , you have inspired me and motivated me to aquire new skills.

Medha Bansal:

Kai Yeh:

The past 16 months have been one of the most enriching experience of my life. This journey would not have been possible without the immense support that I got from my family, friends and team mates.

First and foremost, I am grateful for having the opportunity to work with my teammates - Saumil Nagar and Medha Bansal for this dissertation. It would not have been possible without this collaboration.

Foremost, I would like to extend my sincere gratitude to BK Gizi Pruthi for being my constant guide and a source of immense positivity. Her guidance has been invaluable in this journey.

I would not be half the person that I am without the unconditional support and love from parents and grandparents. Thank you for believing in me and encouraging me to push my boundaries with everything that I do. I am indebted to all the sacrifices that you have made.

My friends have been an integral part of this experience. They have stood by me in every challenge and opportunity and have constantly inspired me with their exceptional talent and achievements. Thank you Saloni, Abhishek, Devanshi, Rodrigo, Vyjayanti, Ekatha, Shibani, Manasi, Manasa, Sreya and Saavani.

Lastly I am thankful to the newest additions to my family- my nephews Aryavir (Aru) and Shivansh, for filling my spirit with zeal and enthusiasm

My thanks as well to my family for supporting me in this endeavour to pursue an architectural master’s degree. Their continuous encouragement and care motivated me to see everything until the end.

Lastly, I want to thank my best friend in the UK – Patrick Lawrence Monfort – for all the support, both inside and outside school. This entire journey was made even more amazing because of his good company.

Satellite imagery of sand encroached agriculture fields in western Thar, India Source : Google earth 2019, 24th June 2019

Abstract Today desertification due to climate change and population rise has led to loss of productive landscapes more than ever before. Though the problem persists at a global level, efforts can be made at local and regional scales to design systems that are resilient to process of desertification.

The project aims to design one such system, the principles of which could be adopted to mitigate the instability of linear dunes in the Thar desert and allowing for productive landscapes and settlements to coexist.

Research is conducted in strategising the use of ecological sand stabilisation techniques to form wind deflection and building material systems that can establish a control over the sand influx in such arid biomes. As a part of the scheme, localised cementation of granular material using microbial grouts is proposed to develop underground/in-dune habitats. The morphologies of these habitats is a resultant of site study, fabrication constraints, machine tool paths and the use of environmental analysis methods. These together inform the design strategies.

The research is further extended to integrate site specific water harvesting techniques in the system to form a holistic developmental scheme. The habitable, agricultural and hydrological systems work in synergy at different scales and time steps for the transformation of the expendable landform into a productive landscape.

Contents 1. Introduction ........................................ 15 Desertification ............................................................................16 Context: Thar desert .................................................................18 Research question .................................................................... 25

2. Domain.................................................. 29

5. Design Development .......................117 Habitable spaces ....................................................................... 118 Deflection system: scalability ............................................... 132 Resources and infrastructure ................................................146

6. Design Proposal .................................165

Western Thar................................................................................ 31 Dune dynamics .......................................................................... 36 Sand stabilisation techniques .............................................. 40 Water resources in Thar............................................................58 Research proposal .................................................................... 62

Program distribution ............................................................... 166 Cluster design ............................................................................ 176 Global time-scales......................................................................186

3. Methods ............................................... 65

7. Analysis and conclusion ................. 201

Overview ...................................................................................... 66 Digital tools.................................................................................. 69

8. Appendix ............................................. 207

4. Research developments ................. 73

9. References ........................................... 223

Bio-mineralisation..................................................................... 74 Stepped profile........................................................................... 86 Sand channels............................................................................. 92 In-dune habitable spaces........................................................96 Deflection system...................................................................... 104

10. Bibliography ..................................... 229 11. Contribution sheet..........................235

1. Introduction

Very low Low Moderate

0.5- people / km2 Great Victorain

9 people / km2 Gobi desert

83 people / km2 Thar desert

0.2 people / km2 karakum desert

15 people / km2 Arabian desert

0.5 people / km2 Kalahari desert

3 people / km2 Sahara desert

2 people / km2 Patagonai

Dry

4 people / km2 Atacama Desert

Very High

25 people / km2 Great basin

High

1.1 Desertification The world today witnesses rapid increase of human population and their unprecedented dependence on natural resources. The rising human pressure on land to meet these demands have subjected the resource to exploitation and redundancy. Coupled with the changing climatic patterns, degradation of dryland (arid, semi-arid and dry subhumid areas) in all its forms and levels is called Desertification (United Nations Convention to Combat Desertification (UNCCD 2014)).

Implying that the two dominant reasons causing desertification -climate change and human activities have subjected 3 billion of world’s population housing in these areas to reducing vegetation covers, shrinking water bodies and loss of wildlife. 1 Climatic changes in its form and behavior modulate the exchange of energy and material between all other systems.2 Changing climatic patterns have altered the terrestrial biomes and have imposed a direct impact on physical processes like water cycle and functioning of ecosystems. In terms of global populations, these changes also mean that food-production zones are shifting, and in many regions crops and livestock are failing . The drought creating climatic trends and land degradation form a complex synergic input to create pressure on environment that has escalated Desertification, transforming it into a global phenomenon .3 As quoted by UNCCD in 2014, Desertification is a silent, invisible crisis that is destabilizing communities on a global scale.

50%

Livestock

Population

44%

Global crop production

16 I Emergent technologies and design

33%

41%

Total land coverage

226

87

4% ia 2 As

Oce nia 12 %

Africa 17%

8

14%

57

188

So

0%

ut

e1

hA

op

me

Eur

ri c a

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N o r t h A m e ric a 5 8 % 5% ld 1 W or

Wind erosion

Chemical degradation

Water erosion

Physical degradation

Population densityperson/km2

Figure 1.3 : Continental land degradation and poulation density Source : Zdruli, Pandi & Cherlet, M & Zucca, Claudio. (2016). Mapping desertification: constraints and challenges. Encyclopaedia of Soil Science, Third edition, (Ed. R. Lal). 10.1081/E-ESS3-120052917.

Top left : Desertification vulnerability based on soil and climate data climate data

Source : Zdruli, Pandi & Cherlet, M & Zucca, Claudio.

(2016). Mapping desertification: constraints and challenges. Encyclopaedia of Soil Science, Third edition, (Ed. R. Lal). 10.1081/E-ESS3-120052917

Bottom left : Dryland statistics

Source : https://www.un.org/en/events/ desertification_decade/whynow.shtml

Top right: Continental land degradation and population density

The global population has already reached 7 billion and it is projected that the sum will reach to 8.3 billion in next decade. The growing population account to practice unsustainable human activities and put land to risk. Human activities like expansion and intensive use of agricultural lands, poor irrigation practices, deforestation, and overgrazing have contributed to desertification.

As these unsustainable practices put immense pressure on the land, they also alter the soil chemistry and hydrology of that area. These activities result in overexploited drylands suffering from erosion, soil salinization, loss of productivity, and decreased resilience to climatic variations.4 Increasing human pressures on land combined with climate change will reduce the resilience of dryland populations and constrain their adaptive capacities.. In rural areas where people depend on scarce productive land resources, land degradation is a driver of forced migration. It is estimated that desertification can cause displacement of 135 million people. By 2050, 200 million people may be permanently displaced environmental migrants . The combination of pressures coming from climate variability, anthropogenic climate change and desertification will contribute to poverty, food insecurity, increased disease burden and potentially to conflicts.

Source : Zdruli, Pandi & Cherlet, M & Zucca, Claudio.

(2016). Mapping desertification: constraints and challenges. Encyclopaedia of Soil Science, Third edition, (Ed. R. Lal). 10.1081/E-ESS3-120052917.

In-dune I 17

1.2 Context : Thar desert, Rajasthan The arid zone of the northwestern part of the Indian sub-continent houses the world’s most populated desert- Thar Desert. In India, most of Thar is located in western Rajasthan. Climatologically it lies in the region of dry, subsiding air masses of sub-tropical anticyclone. These diverging airmasses create unfavorable conditions for conventional showers despite of the great heat. The desert is slammed by large, shifting sand dunes and frequent dust storms. (Refer to Appendix Section 8.1 for dune morphologies across Thar) The extreme climatic conditions and anthropogenic disturbances caused to land in this part of the world has led India to face the heat of Desertification and imperil 120 m ha of its land to depletion .6 The ecological imbalance between humans, plants and climate have abated the stability of the terrain and subjected Thar to expansion. At present the desert is expanding at the rate of half a mile per year and has accelerated the subsidence of productive landscapes in north India .7 Dominated by strong winds from South-west, about 76% area has been mapped under wind erosion and deposition form of land degradation.8 Living in between the shifting sands of western Rajasthan formulate unfavorable existential conditions. The current scenario poses a threat to the future population and to the existing 40% of Rajasthan’s total population living in Thar.

18 I Emergent technologies and design

Total population

75% 25% Total : 68,548,437 Rural : 51,500,352 Urban : 17,048,085

96.5% 3.5%

Agriculture Labourers

Total : 68,548,437 Rural : 51,500,352 Urban : 17,048,085

Rural Urban

Cultivators

Others

98% 2% Total : 68,548,437 Rural : 51,500,352 Urban : 17,048,085

68% 32% Total : 68,548,437 Rural : 51,500,352 Urban : 17,048,085

+48.5%

-22.79%

Camels

-20.23%

Horses

+280.93%

Donkeys

Mules

Rajasthan livestock population 2012 Rajasthan livestock population 2007 Graph 1.1 : Livestock population trend ( 2007 - 2012) Source : http://animalhusbandry.rajasthan.gov.in/livestock_census.aspx

70.0

35%

65.0

20%

15%

10%

Population in millions

25%

28.5

60.0 55.0 50.0 45.0

28.0

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Temperature in .C

30%

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5%

10.0 5.0 27.0 Years

1955

1960

1965

1970

1975

1980

1985

1990

1995

2000

2005

2010

Rajasthan annual mean temperature Rajasthan population

Graph 1.2 : Trends of population growth , temperature and land lost due to degradation in Rajasthan

1.2.1 Problems

Source : http://berkeleyearth.lbl.gov/regions/rajasthan https://www.census2011.co.in/census/state/rajasthan.html

Top left : A dust-storm over India originated from the Thar region, captured by the Moderate Resolution Imaging Spectroradiometer on the Terra satellite.

Source : https://earthobservatory.nasa. gov/images/11543/massive-dust-storm-inpakistan

Bottom left : Rajasthan Demographics Source : https://www.census2011.co.in/ census/state/rajasthan.html

Top right : Trends of population growth , temperature and land lost due to degradation in Rajasthan T

The vicissitudes of climate change and human activities have majorly effected socio-economic fabric of the settlements housing Thar.

Characterised by the scarcity of water, vegetation and fragility of the soil, the region has faced frequent and severe spells of drought than any other region in the country. It is likely that the region will suffer from greater water shortage due to the impact of global warming in the form of reduced rainfall and increased evapotranspiration.9 Degraded water resources and terranean conditions have subjected the area to the loss of productive landscapes and accelerated desertification.

The region shows high percentage of rural population and their economy majorly driven by agriculture and pastoralism. The increasing human population pose a serious threat to meagre vegetal resources of the arid lands. The trees and shrubs and even their roots are indiscriminately cut by them for domestic fuel. As these people are still dependent on rainfed yields, changing rainfall patterns have made agriculture a non-dependable proposition. Studies have shown failure of atleast 33% of crops due to thin soil covers and high percentage of soil salinity, inculcated by aridity.

Source : http://berkeleyearth.lbl.gov/regions/ rajasthan AND https://www.census2011.co.in/ census/state/rajasthan.html

In-dune I 19

Reduced yields have created a shift of dependence to animal husbandry, mining and other serious activities 10 (Refer to Appendix Section 8.2 for livestock population trend). The increased dependence on pastoralism has resulted in over-grazing of sparse vegetative resource, implying further degradation of land and its exploitation in the form of wind and water erosion. Thus, creating a vicious cycle of causes and problems. Decreasing hectarage of culturable lands, unfavorable climatic conditions and lack of economic growth opportunities have marginalised the locals and subjected them to migration. The situation demands for redevelopment of this region focused primarily on reinstating productive landscapes and human settlement.

Changing morphology of the dunes across Thar are an account of varying wind patterns, wind speeds, ground condition (vegetative cover and built fabric) and demographics. These factors vary at a local scale for each region and demand for a region specific strategy to mitigate Desertification.

20 I Emergent technologies and design

o ate et lim c u d ase to ns due ional b ces t re upa resour l cc ura ods t eth a m n ing ann ing m n pl ba sion ro

ou

es

fl o

odi

ng r c gr es s i n t c u lt t r u c t u r e ag ens ural fi elds ric it y of an ul co tu ra d u s t s t o r ms l pr mf odu o rt OB c t i v it y in s LE e tt e lm e n ts MS

Variatio n in rain Variati f on i n te all p at m Lack of d per ter a Explo i itat vers tu e i o no o Trad itio n n far Lack of Win ur de

CAU SES

ors l fact ors a t n ct me uced fa n r d vio an in n E m ange te ch u a H clim change

fra

in

rr

al

on a si ate Occ w ed of L a c k o v er a c d S a n d v ere & i co cy Sand e n an d u q fr e um it y I n c r e a s e d l f e rt il n d h a s oi ce Reduced n e i l r e si Lack of

Loss of green cover Climate change Desertification

Land degradation Population rise Poverty

PR

Above: The Desertification feedback loop, Causes and Problems

In-dune I 21

Image from site visit: The only accesses road to an urbanized village being cleared of windblown sand.

Image from site visit: The lack of fodder and extreme climatic has led to the depletion of livestock.

How can ecological sand stabilisation techniques be used to design settlements and productive landscapes resilient to desertification in Rajasthan ?

Image from site visit: Isolated houses in the interdunal plain covered in unstablized sand

Problems

Solutions

Research area Sand stabilization techniques

Extreme temperature

Sand covered infrastructure

Sediment free region

Wind deflection

Wind erosion

Thermal discomfort

Thermal resistance

Material and fabrication system

Variation in rainfall pattern

Land degradation

Erosion control

Erosion measures

Dependancy on livestock

Over exploitation of resources

Water retention

Agronomics

Agricultural economy

Water resource management

In-dune I 27

2. Domain Desertification being a global problem, has made large productive landscapes redundant and subjected people living in these areas to migration. Amidst the adversities, there are opportunities to procure the abundant resources in a desert and combine them with traditional and modern mitigating interventions.

The following section is a study of physics of dune formation and their mobility in context to the test region. The chapter also documents various sand stabilisation and deflection measures which can be adopted and adapted to the test region at different scales. Some of these techniques need to be complimented with infrastructural support of ensured water supply and its treatment measures.

The chapter outlines the tools needed for developing spatial and conceptual interventions that can sustain survival in an arid biome.

250 350

%)

150

%) Wind erosion index (%)

fall (mm)

30

fall (mm)

60

15

450

Average Annual Rainfall (mm)

550 Result Wind

Churu Bikaner

Test region

chanoid

chanoid

noid Fields

noid Fields

Major Barchan & Barchanoid fields

Pokaran

Scale of wind erosion LEGEND index DOMINANTLY 20(%)OLD 10 DUNES km/

Jaisalmer Jodhpur

LINEAR DUNES 20 10 km/ Scale of wind erosion

index ( %) Scale of wind erosion TRANSVERSE 180 index ( %) Extremely High

Localized Barchans

480

Very High High 180 PARABOLIC Extremely 120 High Very High 120 STAR DUNES 60 Moderate High 60 30 NETWORK: LINEAR DUNES Moderate WITH TRANSVERSALS Low 30 15 Low NETWORK: TRANSITIONAL Very Low PARABOLIC DUNES 15 Very Low NETWORK: SINUOUS DUNES NEW DUNES Active dunes fields

Barmer

Sc in

240

18

120

250

Major Megabranchanoid Fields

150

3

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1

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MEGABARCHANOIDS

Megabarchanoids SAND STREAKS AND ZIBARS

Wind erosion index (%) Resultant wind direction

12

6

BARCHANS &and BARCHANOIDS Barchans Barchanoids

Average annual rainfall (mm)

20

100km 50 km

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Temperature

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February

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Dry Bulb Temperature °C Global Solar Radiation W/m²

Graph 1.1 : Annual weather data Source : http://animalhusbandry.rajasthan.gov.in/livestock_census.aspx

C

0

42< 41 40 39 38 37 36 35 34 33 <32

Top left: Wind erosion index, annual rainfall and active dune fields

Source : Singhvi, Ashok & Kar, Amal. (2004). The aeolian sedimentation record of the Thar Desert.

Journal of Earth System Science. 113. 371-401.

10.1007/BF02716733.

2.1 Western Thar 2.1.1 Climatic conditions The Thar desert is the easternmost extension of the vast SaharaArabian deserts in the horse latitudes. The desert is dominated by the south-west monsoon, which controls both the wind vector and the vegetation cover. Despite the presence of considerable precipitable moisture in the atmosphere, dearth of rain in this region is a result of configuration of atmospheric dynamics and sinking air masses in the region. The sinking air increases the surface pressure and temperature significantly. Atmospheric circulation thus becomes a key to bring amplifying changes in rainfall, winds and aeolian dynamism.11 The present study is carried out for Jaisalmer district which falls within the arid region of India and cover maximum area of Thar Desert. The district can be best described as unstable dunal terrain, dominated by climatically dry atmosphere, high temperature (reaching maximum 50°C in summers) and a low rainfall (32-78mm).

Subjected to increasing frequency of dust storms over past 22 years, the region has faced 47% drought in past 50 years .12 Vulnerability to sand movement through erosion and depositional processes has increased for the region due to absence of any substantial vegetation cover and agricultural activities, coupled with high wind velocity.

Top right : Figure: Annual temperature and radiation data Bottom right : Sunpath and summer solstice dry bulb temperature

In-dune I 31

2.1.2 Settlement pattern Housing a total population of approximately 670,000 people, the western and the southern parts of Jaisalmer district are made up of wind-heaped sand-dunes, where there is little opportunity for settlements to flourish. These settlements amidst shifting linear dunes are located mostly in the inter-dunal planes. Lower wind speeds in this area subject the planes to heavy sedimentation and limit the people to grow their crops close to the settlements.

The population in this region can be divided into two broad categories- sedentary and semi-nomadic or nomadic .13 Since the area provides best bases for pastoralists and nomadic activities, people mostly live in rural setting of villages, scattered houses and wandhs (Campsites). Most of these units are built of locally procured wooden material and thatches .14 These settlements are thinly populated and scattered all across the dunal planes. Apart from the climatic adversities, the skeletal nature of the route network causes isolation to this area . The lack of public utilities with no direct access to centralised services retard the rural-urban relationships and interdependence for this region. These settlements are thus a medley of houses and streets with no defined morphological pattern.15

Top : Topography and wind pattern in the text region Right: Satellite imagery of the Sam district in Jaisalmer Source : Google earth 2019, 24th June 2019

Phuiya

2100

600

700 Myajlar

2700

Satto

3500

Tejrawa

1050 600

Bachiya

Punraj ka par

450

300

Urbanized village

1.0 km

Central village Non-central village

0.5 km

2.0 km

34 I Emergent technologies and design

K B

L K

Despite having organic pattern of settlements, the layout of individual houses are strictly governed by the economic and social status within communities. The effectiveness of this discrepancy creates a variety of materials that can be afforded to build the houses.

Building materials used for roofs and walls form the main criteria for classification .16 The average family size within these social classes is 6.2 persons .17

T

B

The low income groups usually house in a simple layout, single room house with thatched roofs. The layout is generally circular or rectangular. The walls are usually made up of muds and periphery of the plot is guarded by thorny bushes. There is generally no provision of bath or toilets. The main function is shelter for man and livestock.

The thorny enclosure associated with it is multi-purpose and keeps out stray animals, provides a sleeping place during summer nights and space for livestock and storage for fodder.

V

T

T

C

B

Medium and High income groups usually house in more elaborate houses made of stronger materials like unburnt and burnt bricks walls or stones walls with titled roofs (made of local clay). Most of these houses are usually more than 1-storey high with a central and open courtyard, allowing for more air circulation. Massive in their appearance, these houses provide better living conditions- Room for residents and guests, Verandah as a semi-open sitting space, 2-3 living rooms, covered store and kitchen and baths and toilets.

K S

B

The socio-economic conditions thus define the outcome of rural housings- thick mud walls, narrow windows, conical or flat roof oriented against the prevailing winds to lesson sand blast effect.

The use of these locally available materials make the dwellings rudimentary and structurally primitive and less durable to face the impact of strong winds.

C

L

V

0m

Above: Typical house layouts Documented on site visit

Top left: Stone and mortar house Centre left: Sand covered mud house Bottom left: Abandoned construction site Images form site visit

3m C

Courtyard

V

Verandah

L

Living

B

Bedroom

K

Kitchen

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6m

In-dune I 35

Fig: deflection dunes

120 - 140°

120 - 140°

2.2 Dune dynamics 2.2.1 Aeolian processes

The shearing force of the wind moves the sand particles in three distinct ways: saltation , surface creep and suspension. While blowing wind velocity determines the mobility and volume of the sand particles, the size of the sand grain determines the way it is transported. Of all the modes, saltation is the most dominant process of sand transport. However, up to 25% of all wind-transported sand is moved by surface creep .19 As wind moves over a sand deposit, it is able to pick up grains from the surface and give them a forward momentum, but the weight of the sand grains soon bring the grains back to the surface. If the surface is composed of coarse grains, the saltated grain is bounced back into the air and the progression continues. However, if the surface is composed of fine grains, the saltated grain buries itself into the ground upon striking it. The effect however splashes another particle into the air and subjects it to transportation. The saltated grain can attain a maximum height of upto 2m .20 26871 km2 (71.0%) of the area in Jaisalmer is occupied by coarse sand which has poor water retention and nutrient status .21 Coarse sand texture, low soil moisture content and high wind velocity ( 8 m/s) for most of the year, subject the site terrain to instability and constant saltation.

Fig: non-porous barrier

greater voxtex shedding

Fig: porous barrier

height - 1 to 1.5m porosity - 30 to 40%

longer leeward shelterd ground

“Exchanges of energy and material animate the morphological processes within differing climatic regimes, acting on small particles or grains at a very small scale but producing large forms and complex behaviour over much larger dimension”.18 The emergence and temporal variability of deserts are an interplay between aeolian processes acting as an external force onto the landforms that are a resultant of tectonic and volcanic activities.

<20 µm diameter- long term suspension 20-63 µm diameter- short term suspension 63-500 µm diameter- saltation > 500 µm diameter- repetation and creep

Critical wind speed for 0% moisture (260 µm)- 6 m/s Davidson-Arnott et al. (2007) Angle of repose for fine sand ----- 36o Angle of repose for coarse sand - 40o

Top: Modes of wind blown transport of sediment Source: Lancaster, Nicholas. (2005). Aeolian erosion, transport and deposition.

36 I Emergent technologies and design

14

Factors affecting Saltation

0.6

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Leeward side

Burial time of sand New Dune migration in the resultant wind direction

36°

Old

36°

In-dune I 37

New slip face Old slip face

Top: Critical shear velocity and critical wind velocity of dry, loose sand particles.

Source: Leo C. van Rijn, Aeolian transport over a flat sediment surface

Bottom: Dune migration

Source: Zhiwei XU, A. MASON Joseph, Huayu LU, Shuangwen YI, Yali ZHOU, Jiang WU, Zhiyong HAN. Crescentic dune migration and stabilisation: Implications for interpreting paleo-dune deposits as paleoenvironmental records[J].Journal of Geographical Sciences, 2017

38 I Emergent technologies and design

2.2.2 Linear sand dunes of Thar Linear dunes form a regular and extensive landform on Earth.

Subjected to two modes of migration, linear dunes can either grow by extension down wind or migrate obliquely. The two modes are not mutually exclusive and likely occur in different proportions based on the wind regime .22 Resultant of bi-modal wind directions, linear dunes align themselves in the direction of sand deposition (or dominant wind direction) and cover most of the land in the western part of Thar.

Having symmetry across shorter cross-section, active linear dunes have an array of summits and saddles along their length. Old dune fields like the one situated in the western Thar have a broad convex crest. However, the recently forming ones or the reactivating linear dunes are sharp crested like those in the Sahara and the Middle East. Loose crests and flanks create an illusion of the dune’s instability.

Sunlight hours analysis Summers Period : May-Jul Time : 6:00am to 6:00pm

Hours 0 200 400 600

Plants hold the surface of the dune from all but the strongest wind direction and thus orient the dune field parallel to strong wind. Vegetation thus forms an integral part of these dunes .23 At a global scale clustering of linear dunes across the entire region, can be seen varying from un-joined and short-feathered ones to inverted Y- juncture ones to converging clusters of 5-8. The site is dominated by 10-12 kms long independent un-joined dunes that form a linear sequence of crests and valley .24 Even though these older dunes might gain stability with time they are subjected to constant degradation. Knowing the geomorphology of the dunes and dominant factors evolving it help to formulate dune and region specific sand control techniques.

800 1000 1200 1400

Winters Period : Nov-Jan Time : 6:00am to 6:00pm

1600 1800 2000

Conclusions The orientation of the dunes with respect to solar path subjects it to no self-shading and high radiation values throughout the year. While the predominant wind aligns the dunes globally, the subsidiary wind segregates the dune profile into windward and leeward flanks. The segregation locally creates variation on the dune surface in terms of slopes, sedimentation and wind velocities.

A cross-section along the shorter side of two adjacent dunes shows accelerated wind speed in the valley region due to funnelling. The decrease in wind speed from valley to crest dominates the resulting sedimentation pattern in a similar way. Heavier sedimentation at the crest makes it an obvious choice to plant the shelter belts and protect the dune valley. While the influx of sand is constant and beyond human control, these factors provide enough clues to design and induce sand stabilisation and deflection schemes into the existing dune system.

In-dune I 39

2.3 Sand stabilisation techniques Surface stability is fundamental to the interplay between processes and factors that determine the character of dune surfaces and spatial variation .25 Factors like wind patterns, sedimentation rates, slopes of flanks and their effectiveness on the terrain define the scope of different stabilisation measures.

Ecological imbalance is induced when sand laden strong winds blow over fertile soil, taking away the soil moisture and exposing it to erosion and degradation. The resulting action hampers the yield of agricultural land and growth of endemic plants. The principal behind stabilisation is to minimize sand influx for the period required for the initial establishment of natural or planted species on the mobile dune faces.

Influx of sand can be reduced by suppressing saltation. Wind carrying sand can either be reduced in velocity, accelerated or deflected away from the target region to control the dune mass and sedimentation rates.

Abundance of sand can cater to the development of a material system that can be used locally by hardening the sand. Successful stabilisation of mobile dunes thus involves the use of multiple techniques at different time scales. The following sub-chapters discuss these techniques and their interdependencies.

Erosion control systems

Wind deflection systems Sand stabilisation techniques Protective screens on surface

Building material systems

Porous and non-porous barriers Plantation on mobile dunes Bio-mineralisation

40 I Emergent technologies and design

2.3.1 Protective screens Mulch:

Fixed net

Palm fibre layer

Seeds and nutrient soil layer

Non woven fabric layer

Fixed net

Palm

mat geotextile : Natural + synthetic material ; also suitable for sub-soil reinforcement

Mulch made out of materials such as straw, branches, stalks and plant waste can be uniformly distributed over the dune surface to prevent erosion. Mulching is suitable for controlling saltation in the areas with low wind velocity and gentle slopes. Hence, they are placed on leeward flanks and places that are less steep. It has an added advantage to increase the organic content and water retention properties of the dune sand.

Geo-textiles: Geo-textile sand fixation measures combine engineering and biological sand fixation measures by using plant fabrics as the carrier of seeds (of trees, shrubs, and grass) and nutrients for soil. These natural carriers are fixed by a fabric net.

Natural fibre like jute geotextiles degrade to form an organic mulch and help in quick establishment of vegetation. Different fibres degrade at different rates. While coir geotextiles degrade in 2-3 years, jute degrades in 1-2 years. Coir is therefore useful in situations where vegetation will take longer to establish. The hairiness of Jute fibre makes it useful to absorb more moisture and control dust, making them suitable for low rainfall areas. 26 The short life-span of these protective screens find their use in shielding the initial growth period of saplings before they degrade naturally.

2.3.2 Aerodynamic method Aerodynamic Method focuses on altering the speed of wind and its sand carrying capacity to control the sedimentation pattern on the terrain.

Wind can be accelerated to maintain the critical threshold by placing obstacles that funnel the wind and take away the build-ups of sand, thus creating larger sediment free areas. This method is applied to streamlining the streets and any other obstacle around it in desert settlements.

Mulch : covering 20% to 30% uniformly Jute geo-textile : covering entire over the total surface surface. Textile surface is porous to census enable growth of saplings

Alternatively placing obstacle such as fences reduce the velocity below the critical threshold and trap the sand before it reaches the target region .27 The accumulated sand can then further be used as a mound or deflection system to change the dynamics of the wind.

Images source : https://www.ecplaza.net/products/jute-soil-saver-jute-geo-textile_4228811, December 17th 2019

In-dune I 41

Fig: artificial check dunes for multi-directional winds

Fig: deflection dunes

greater deposititon rate lesser deposititon rate

120 - 140° 120 - 140°

Fig: deflection dunes

Resultant sedimentation around non-porous barrier

Wind flow through porous barrier

3.5m

Fig: non-porous barrier

Fig: porous barrier

For a terrain like our test site where total loose sand area is vast, wind deflection system is a more viable option.

3.5m

Artificial dune growing process over 4 years

Images source : Bruno L,Horvata M, Raffaele L” Windblown sand along railway infrastructures: A review of challenges and mitigation measures, Journal of Wind Engineering & Industrial Aerodynamics” 2018

42 I Emergent technologies and design

Fig: artifical check dunes for unidirectional winds

Resultant sedimentation around porous barrier

greater voxtex shedding

height - 1 to 1.5m porosity - 30 to 40%

longer leeward shelterd ground

A permanent deflection system can be evolved by creating a system of stabilised artificial dunes. Placing the dune fences at an angle of 120-140° to the average prevailing wind direction can accumulate sand over the years and evolve as deflection dunes with addition of fences over it in phases. The volume of sand trapped by a fence varies as a function of the square of its height. The positioning of sequential fences will determine the dune form. 30

3.5m

Fig: non-porous barrier

greater voxtex shedding

Fig: porous barrier

height - 1 to 1.5m porosity - 30 to 40%

longer leeward shelterd ground

The bimodal nature of wind direction on the site suggests the placement of fences not just directly across the path of the prevailing wind but in a checkboard grid. The accumulation of sand in grids leads to formation of smaller check dunes. The size of the mesh in the grid is determined by the intensity of the winds and the slopes and shapes of the dune. The more complex the dune model, the denser the grid (fences and interior wattling ), which can range from 600 to 1200 linear metres per hectare. To keep this system more effective, the accumulated sand shall be removed at least 30 cm below the fence height.29

Wind flow around non-porous barrier

Fig: artifical check dunes for unidirectional windsdunes for multi-directional winds Fig: artificial check

120 - 140°

120 - 140°

Fig: porous barrier

Fence with porosity less than 20% acts as a solid obstacle for sand deposition and the sand is deflected/ accumulated in front of the obstacle. Fences with porosity 30-50% create optimum condition for sand accumulation without causing any turbulence in the lee.

The height of the fence is maintained between 1.5-2m to match the vertical saltation limit .28

Fig: non-porous barrier Fig: deflection dunes

greater deposititon rate lesser deposititon rate

greater voxtex shedding

height - 1 to 1.5m porosity - 30 to 40%

longer leeward shelterd ground

Porous Barriers/Fences can be used to trap sand and promote its lateral and vertical growth in a controlled predictable manner. The success of fences are subjected to three factors- a) volume of blown sand, b) number, position and height of the fence and c) porosity of the fence screen.

Fig: artifical check dunes for unidirectional winds Fig: artificial check dunes for multi-directional winds

Sand Accumulation

120 - 140°

Porous barrier:

longer leeward shelterd ground

120 - 140°

height - 1 to 1.5m porosity - 30 to 40%

Fig: porous barrier 120 - 140° greater voxtex shedding

greater deposititon rate lesser deposititon rate Fig: non-porous barrier

Fig: deflection dunes

Arrangement

Material 120 - 140°

120 - 140°

Straw greater deposititon rate lesser deposititon rate Fig: deflection dunes Fig: artifical check dunes for unidirectional winds

Arrangement of artificial check dunes for uni-directional winds

Fig: artificial check dunes for multi-directional winds

Shrubs and branches

Plastic Fig: artificial check dunes for multi-directional Arrangement of artificial check winds dunes for multi-directional winds

120 - 140°

Stone 120 - 140°

greater deposititon rate lesser deposititon rate Fig: deflection dunes

Arrangement of deflection dunes

Tree stalks

Images source : Guo, Z.; Huang, N.; Dong, Z.; Van Pelt, R.S.; Zobeck, T.M. Wind Erosion Induced Soil Degradation in Northern China: Status, Measures and Perspective.

Sustainability 2014, 6, 8951-8966.

In-dune I 43 Fig: artificial check dunes for multi-directional winds

2.3.3 Plantation of dune grasses, shrubs & trees Psammophytes: Psammophytes are plants that survive in shifting sands. A number of adaptive features such as resilience to extreme temperatures, high salinity and low water requirement enable them to survive in barbarous desert conditions.

Psammophytic trees and shrubs form strong organic roots on those parts of their trunks buried in the sand. Adventitious buds followed by shoots arise on the exposed roots. These roots sprout through the sand and grip it tight. Perennial Psammophytes have small leaves or no leaves at all. This further reduces their dependence on limited water available. The fruits have appendages in the shape of wings or parachutes that enable them to move with the sand and to remain on the sand’s surface. After seed germination (usually in early spring), the roots grow very quickly, soon reaching a depth of approximately 0.5 m. At this depth, the sand remains moist until the onset of summer. 31

Calligonum polygonoides, a shrub locally known as phog

Source: https://www.wildflowers.co.il/hebrew/picture.asp?ID=6992

Despite the difficulty of establishing the vegetative cover, it forms an efficient dune arresting mechanism.

Espacement: Within the availability of limited resources in the region, distribution of these resources becomes extremely critical. In arid and semi-arid zones, density of seedling will depend on the richness of the soil, depth of residual moisture, and rainfall. The lower the rainfall, the greater the spacing along and between planting lines, in order to avoid competition between seedlings and exhaustion of the soil’s water reserves.

Seedling production and planting period: Battered by unfavourable growing conditions, protection and sustenance of plant species is extremely important. Since the period of optimal moisture content is very short, it is desirable to raise seedlings in nurseries where a regular water supply of water is maintained. Seedlings can be raised in earthen tubes or beds. The sowing should be such that the saplings reach a desired age/height by the transplanting period.

Planting depth Deep plantation ensures tapping of moisture within the depths of soil. However, research has shown that in arid region of Rajasthan it is economical to resort to shallower planting depths in depressions (50-70 cm) and deep plantation in high dunes. For example, planting depths can range from 80 to 120 to 150 cm from dune slope to crest.32 To protect seedlings from the abrasive effect of the wind, plants are planted deep into the soil in 3:1 or 2.5:1 ratio to give them a good chance of taking root. It is also to be ensured that the aerial part should be at least 30 or 45 cm above the soil. 33

44 I Emergent technologies and design

Marram Grass or Ammophila arenaria Source: http://www.terrain.net.nz/friends-of-te-henui-group/plants-grasses-sedgesrushes-nz-natives/ficinia-spiralis-pingao.html

10m X 10m (staggered) 150 seedlings/ hectare

11mm

10m X 10m 100 seedlings/ hectare

100mm

7m X 7m (staggered) 235 seedlings/ hectare

235mm

7m X 7m 200 seedlings/ hectare

200mm

5m X 5m (staggered) 462 seedlings/ hectare

400mm

5m X 5m 400 seedlings/ hectare

462mm

Plantation spacing based on rainfall pattern adapted in Mauritania Source: http://www.fao.org/3/i1488e/i1488e04.pdf

Fertile soil Porous layer Dune sand 1cm distance between seeds

20 cm

10m

Nursery size

Capacity

1m

Water requirement 0.5m 1m

10 m2 ( 10m x 1m)

Seedlings grown per year - 1000

20 L /m2/ watering Predominantly shaded: Morning and evening sunlight intake

Specifications and yield of a plant nursery Source: Embedded Morphophonemics, AA Emtech

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Setting up porous barriers Mulching on dune Preparation of nursery beds Sowing in nursery beds Direct sowing of slow growing woody and grass species on dunes Raising nursery seedlings Transplantation form nursery Casualty replacement Subsequent watering

Calender of activities of planting tree seedlings and grass slips on shifting sand dunes Source: R.N. Kaul, Sand Dune Stabilisation in the Thar Desert of India: A Synthesis, Annals of Arid Zone 35(3) : 225-240, 1996

In-dune I 45

2.3.4 Plantation of crops ( Agronomics ) Water retention : Adoption of soil and water conservation practises such as peripheral bunding, contour bunding, water retaining pits and vegetative barrier individually and in combination can help reduce run-off, recharge soil profile moisture and reduce soil loss.34 Water-retaining pits like half and full moon pits and ridges act both as buns and fence. They collect the flowing water into deep undulations, trigger percolation and reduce evaporation.

.2 - .6 m

Addition of chemically carbonised organic matter from harvested crops (Biochar) to the soil conceals the carbon content and improves the water retention property. It further facilitates the growth of bacteria and fungi which in return enriches the nitrogen content of the soil.

Half moon pits .2 - .3m

Runoff

27%

65%

8%

Soil improvement: Desert soils are naturally devoid of organic matter. Adoption of specialised techniques like Dryland Cultivation can help conserve natural moisture and nutrient content in the soil. Adoption of drought resistant crops as a part of this method can further reduce the pressure on water requirements and help these plants to restore the lost nutrients in the soil.

Strategic plant selection and distribution when coupled with supply of soil and vermi-compost inside water retaining pits, can significantly improve the organic content of the soil. These organisms can rebuild the soil structure and improve fertility. Increase of organic content can further be accelerated by adopting organic mulching on dune field thus giving a robust foundation for plants to grow.

Ridges and deep tillage .3 - .4 m

.75 m

27%

65%

5%

Runoff

Crop rotation, inter cropping & agroforestry Mulch of surface with slopes less than 3%

While agronomic practice of inter-cropping increases the diversity of crops within the same field, crop-rotation alters the nutrient content and distribution of organic matter across the field. Agroforestry shares its principles with inter-cropping and thus improves diversity by addition of trees with crops. The trees having deeper roots pump out the nutrients deep from the soil and make them available to the neighbouring crops. These trees have an added advantage of controlling soil erosion.

Frequent droughts in the region make pearl millet a better choice than legumes to plant for they can resist the extremities better.

However, rapid growth of leguminous plants along with other crops can replenish the nutrients in the fallow soils.

55%

1%

30m 30m

30m 30m

30m

Bunding around plots witn slopes less than 1% .45 - .6 m Runoff

Above: Planting methods to improve water retention

46 I Emergent technologies and design

44%

27%

65%

5%

Barley

Tomatoes

Marram grass + Gum arabic tree

Moth bean

Marram grass + Gum arabic tree

Monsoon crops Sowing - June Harvesting - November

6-8 months crops harvested and replaced at the end of cropping season

Winter crops Sowing - November Harvesting - March

Sorghum / Millets

Cereal crops replaced with legumes in one cropping season after fallow period for soil nutrient enrichment

Image: Inter-cropping and crop rotation methods integrated with agroforestry

2-3 year period

In-dune I 47

2.3.5 Bio-mineralisation : Infrastructure system 15 Cement related CO2 emission

15

Biopolymers are the most viable environment friendly option. Once added to the soil, they form a stable gel matrix that synergies with ecosystem locally and does not damage it. Combined with their water retaining properties in soil, biopolymers are thought to be capable of promoting vegetation growth.

Global CO2 emission

Cement related CO2 emission

Annual growth rate (%) Annual growth rate (%)

Sand being the most abundant resource can be easily procured and subjected to soil treatment and improvement to be used for engineering purposes. Properties like compressive strength, hydraulic conductivity and durability against wetting and drying and environmental revitalisation of a particular engineered soil starts to define its use at different scales. While within the realm of geotechnical engineering conventional production methods are not economical, alternative biological approaches including microbial injection and by-product precipitation are being investigated. [In] Dune specifically details and adopts the application of microbial induced polymers or biopolymers as a new type of construction binder.

Global CO2 emission

10

10

5

5

0 1980

The most advantageous way of introducing biopolymer into the soil is 0 1980 by externally cultivating it. Exo-cultivation and then direct application overcomes shortcomings of other approaches- need for nutrient injection, cultivation time and excrement precipitation. Apart from injecting directly into the soil, biopolymers can be introduced by various 35 practical modes of application including mixing, spraying, and grouting.Geosynthetics Chemicals Cement (Acrylic polymer)

Chemicals

Cement

polymer) Cement + Water (Acrylic Chemically synthesized polymers

Main Materials

Main Materials Soil Competitiveness

Cement + Water

fine grain

Chemically synthesized polymers

Geosynthetics Various synthesized materials

Various synthesized materials

1990

2000

2010

Year 1990

2000

2010

Year Geopolymer

Geopolymer Pozzolanic materials + water + cement

Pozzolanic materials + water + cement

MICP

Biopolymers

MICP

Biopolymers

Micro-organisms urea + starch

Micro-organisms urea + starch

Biopolymers + water

Biopolymers + water

course grain

Soil Competitiveness fine grain course grain

Carbon Footprint Production of 1kg

1 kg

6 kg

2.35 kg

.4 kg

Nil

Nil

Carbon Footprint Production of 1kg

Contamination of Treated Soil

Contamination of Treated Soil Compressive Strength

1 kg

2 Mpa

Compressive Strength

2 Mpa Graph 1.1 : Overview of ground improvement methods

6 kg

0.8 Mpa

(Acrylic polymer)

0.8 Mpa

(Acrylic polymer)

Source : Introduction of Microbial Biopolymers in Soil treatment.

Top right : Growth rate of CO2 emission Graph 1.1 : Growth rateimprovement of CO2 emission Bottom Overview of ground methods Graph :1.1 : Overview of ground improvement methods

: Introduction of Microbial Biopolymers in Soil treatment.of Microbial Biopolymers in Soil Source :Source Ilhan Chang ,Jooyoung Im and Gye-Chun Cho, Introduction Source : Introduction of Microbial Biopolymers in Soil treatment.

Treatment for Future Environmentally-Friendly and Sustainable Geotechnical Engineering.

Graph 1.1 : Growth rate of CO2 emission Source : Introduction of Microbial Biopolymers in Soil treatment.

48 I Emergent technologies and design

2.35 kg

.4 kg

Nil

Nil

10 Mpa

1.8 Mpa

4.3 Mpa

Fly ash-geopolmer

10 Mpa

Fly ash-geopolmer

1.8 Mpa

B- glucan

4.3 Mpa

B- glucan

Current applications: In the past two decades the research conducted and technology developed for application of bio-mineralized earth materials in the construction industry has shown significant progress. Various models have been tested and proposed at different scales. Biopolymers can display structural stability and durability unless they are subjected to conditions that trigger their degradation. These may include certain combinations of high temperature (80-90 °C), high pressure, moisture content and biological activity over some time interval .36 Biopolymers can be used in the form of viscous pastes, solid blocks or aerosols depending on the application.

Casting and printing ;Biobricks Source bacteria

:

https://www.archdaily.com/472905/bricks-grown-from-

Adhesives: Adhesives primarily contain inorganic hydraulic setting binders and carbonate containing raw materials. Hydraulic setting binders can further be added to adhesives to improve its technical and physical properties. In order to improve the water retention property and consistency of adhesives, hydrophilic and water retaining biopolymer like ether can be added .37 Biobricks: As an input to create solid blocks, biopolymers can be mixed with sand and water to cast bricks. Addition of natural fibres for reinforcement can further enhance the structural property of the mass. Apart from being cast, the composition can be 3D printed, as tested by BioMason. The printing process is however more expensive and time consuming.

Roadworks: Thomas Kosbau and Andrew Wetzler and proposed simultaneous laying of sand and srparying of natural cementationin multiple layers as an alternative method of road construction.

Spraying; Road works

Source : https://inhabitat.com/creating-roads-from-sand-and-bacteriainstead-of-oil/

In-dune I 49

Ground improvement : Microbially Induced Calcite Precipitation (MICP), also known as “bio-grout” is the most commonly adopted process to achieve soil stability. This technique utilises the metabolic pathways of bacteria to form calcite (CaCO3) that binds the soil particles together, leading to increased soil strength and stiffness .38 There are several methods by which bio-grouts can be injected into the soil. For sandy soil, the method of permeation grouting is most suitable. The technique ensures least displacement of sand and maximum, uniform spread of the grout. This technique performs best for sand with low fine content. Structurally, the grout transforms granular soil into sandstone like masses by filling the voids with itself as a less viscous and non-particulate entity.

The grout is added to the soil through a sleeve port pipe into a predrilled hole. The grout is injected under pressure through the ports.

The grout permeates the soil and hardens, creating a sandstone-like mass. A common application of chemical grouting is to provide both excavation support and underpinning of existing structures adjacent to an excavation. 39

Permeation grouting procedure

Source : https://vibromenard.co.uk/technique/controlled-modulus-columns/

Compaction grouting Compaction grouting (radial displacement (radial displacementof ofearth) earth)

50 I Emergent technologies and design

Jet/ Pressure grouting Jet/ Pressure grouting (Partial replacement (Partial replacement/mix /mixininplace) place)

Permeation grouting Permeation grouting (Flow into existing pores) (Flow into existing pores)

Matrix of injections depending on the purpose ( Wick drains in this case)

Source : https://gzzhaohua.en.made-in-china.com/product/wyLEKNnUElWb/China-36-Meters-Wick-Drain-Installation-Machine.html

Injection; Large scale application of bigrout for borewell stability

Source : van Paassen, Leon. (2011). Bio-Mediated Ground Improvement: From Laboratory Experiment to Pilot Applications.

In-dune I 51

2.3.6 Alginate Alginate is a natural polysaccharide generally obtained from brown seaweed and forms a viscous gum by binding with water. Readily available in the country, the biopolymer is relatively cheaper, highly bio-compatible and less toxic. This makes it an obvious choice to be applied in food industry, biomedical uses, paper and textile. 40 Like most biopolymers, Alginate exhibits high sensitivity to water.

This limits its use to effectively treat soil for ground improvement and stability. The use of cross-linking for biopolymers may provide a more powerful soil stabilizing method. Cross-linking is a technique used to greatly improve the properties of a specific material by introducing an agent that promotes interactions between separate polymer chains, thereby enhancing their overall strength .41 Addition of calcium to the biopolymer and sand makes the composition gain strength and repel water solubility. About 5% Sodium Alginate and sand mixture can attain an unconfined compressive strength of 1550 KPa, 96 % of which is attained in 14 days .

Brown seaweed

Sand

+

5% Sodium alginate (Biopolymer)

UCS (Kpa)

2000 1500 1000 500

Step 1

0 Untreated 2+

Xanthum 1%

Agar 1%

Gellan 1%

Alganite 5% Cement 10%

Biopolymer content in sand

+ Graph 1.1 : Comparison of unconfined compressive strength of sand hardened with Ca

various biopolymers

Step 2

Source : Chang, Ilhan & Im, Jooyoung & Cho, Gye-Chun. (2016). Introduction of Microbial Biopolymers in Soil Treatment for Future Environmentally-Friendly and Sustainable Geotechnical Calcium chloride HardenedEngineering. sand mixtureSustainability.

8. No. 251. 10.3390/su8030251. (crosslinking agent) ( water soluble)

Ca Ca

+

Sodium chloride

Above: : Compressive strength of sand treated with different biopolymers Right : Properties of alginate treated sand Bottom left : Biomineralisation and calcification process

Calcium alginate (insoluble in water)

52 I Emergent technologies and design

Source : Zdruli, Pandi & Cherlet, M & Zucca, Claudio. (2016). Mapping desertification: constraints and challenges. Encyclopaedia of Soil Science, Third edition, (Ed. R. Lal).

10.1081/E-ESS3-120052917

1800 1600 UCS - 1550 Kpa 5% Alginate

UCS variation of sodium alginate treated dune sand by using the different amounts of biopolymer

UCS (Kpa)

1400 1200 1000 800 600 400 200 0

0

1

2

3

4

5

6

Sodium Alginate content (%)

900 800

96 % strength attained in 14 days

Curing time effect on the UCS of sodium alginate( 2%) treated sand

UCS (Kpa)

700

100 % strength attained in 14 days

600 500 400 300 200 100 0

0

5

10

15

20

25

30

80

100

120

Curing time ( days)

Influence of temperature on the compressive strength of sodium alginate( 2%) treated sand treated sample

UCS (Kpa)

800 600 Site temperature range

400 200

0

0

20

40

60

Temperature ( °C)

In-dune I 53

Case study: Biogrout experiments at TU Delft A study was carried out to test the scalability of bio-grouting to check the potential of the method in ground improvement. As an ex-situ experiment inside a laboratory, biopolymers are mixed with sand and water and cast in a mould. In another ex-situ experiment set-up bio grouts are injected to containers filled with soil of volumes 1 m3 and 100 m3 through injection wells.

Progression from casting 10 cm3 of sand to injecting 1 m3 and 100 m3 of sand as single point and grid of injections has directed the research to study the flow lines of the bio grout fluids, control the forms and pattern generated along these lines, control inlet and outlet locations of injection and observe pressure difference inside the sand.

The current experiment thus in turn also focuses on controlling the uniformity and structural properties of the hardened mass.

The experiment resulted in achieving unconfined compressive strength from 0-15 MPa. The increase of stiffness from precipitation of carbonate in subsurface can also be quantified as function of the volume of injected grouting agents and its dry-density.

Conclusions While bio-grouting is a scalable technique, the mode of its application creates the difference in varying compressive strengths within the same hardened mass. While the method of casting bricks creates uniform hardened mass with higher compressive strength, the method of injecting the grout directly into the soil creates lesser uniform hardened masses with increasing scale. However, the latter method shall always be preferred for faster larger scale application.

The grout should be injected in low speed so that bio-polymer does not get washed away by calcifying agents.

The scaled up hardened mass is uniform along injection flow lines.

This indicates that an increase in density of injections can increase the homogeneity. Thus, for a large scale ‘uniform’ application deployment of a matrix injection system is ideal.

Since for any given pressure the spread of grout inside sand cannot be digitally simulated, the limits of the spread can only be tested on the site. For the sake of experiments conducted during this research it is assumed that the grout spread is uniform inside sand.

54 I Emergent technologies and design

Experiment scale

Fabrication method

Grout Spread

Homogeneity

2003 10cm3

Dry mix and mould casting

Regular throughout the cast

Uniform

Single point injection grouting

-Regular flow of grout -Spherical cemented pattern

Varied hardening towards the corners and walls

Matrix injection grouting

Clogging of grout near injection point

Homogeneous along injection flow lines.

Cemented pattern related to flow path

Varies across perpendicular section to flow lines

2007 1m3

2008 100m3

Calcium carbonate content (% of dry weight) Non-uniform grout spread >15 %

<1%

Uniform grout spread

Source: Scale up of Biogrout: a biological ground reinforcement method, LA Van Paassen

In-dune I 55

Planting technique adopted on site : 60 cm deep pit for water retention pit + support and protection from wind using twigs and branches Source : Site visit

56 I Emergent technologies and design

2.3.7 Conclusion: Sand stabilisation techniques The techniques discussed in this section as either sand stabilisers or sand deflectors due to varying sedimentation pattern alter the immediate ground conditions and decide for the succeeding functions to occur. While techniques like porous barriers and biomineralised sand accelerate the wind speed and shield the affected area from sedimentation, establishment of vegetation cover reduce the effective wind speed to less than 6m/s and protect the top fertile soil layer from saltation. Increased moisture content in the soil can make it less susceptible to erosion and plants to thrive.

Durability The effectiveness of all the techniques depend on their life spans.

Similar to porous barriers, reducing wind speeds can submerge the plants or trees inside the sand over time and increase the dune’s height over and above the vegetation height. Vegetation covers and porous barriers do not form a permanent solution to shifting sands. They need to be continuously replaced. The initial growth and replacement of plants, other than Psammophytes is not easy for low soil quality.

Interdependence on other systems and technologies Unlike erection of porous barriers and placement of geo-mats, plantation and microbial injection need other resources such as constant supply of water to support their growth and progression.

Dependence on water makes them rely on its ready availability and quality. Considering the unfavourable environmental conditions to procure the resource, these techniques indicate adoption of rain water harvesting and micro-irrigation measures.

For smaller plants and grasses which are most vulnerable to heaping saltated grains, dependence of deflection mechanism is equally critical. Deflection mechanism made of hardened sand needs major machine, material and labour support. Hardened sand gets fully activated only after the material gains full strength and maturity post curing period.

In-dune I 57

2.4 Water resources in Thar 2.4.1 Resources Scanty rainfall, high evaporation and remote location of the site drive the need for water catchment, treatment and circulation techniques.

In order to support the water requirement, water can be procured onto the site using three sources- extraction of ground water, collection of rain water/ surface run-off and connection to existing artificial irrigation canal (Indira Gandhi Canal). While availability of ground water is an existing resource, establishment of rain water collection system and connection to Indira Gandhi Canal are proposed interventions.

Indira Gandhi Canal Project was proposed in 1958 with the purpose of bringing water from northern Himalayan rivers deep into the Thar desert. At present the canal stretches 650 kms and facilitates irrigation of 6770 km2 area in the district of Jaisalmer alone .42 The three potential sources of water inherently carry contaminants of different chemical properties. These differences subject water from each source to be treated separately and used for different purposes.

2.4.2 Treatment Rhizo-filtration : Rhizofiltration is an in-situ, passive bioremediation technique that involves filtering contaminated groundwater, surface water and wastewater through a mass of roots to remove toxic substances or excess nutrients. A few examples of rhizofiltration plants are sunflower, tobacco, spinach, rye and Indian mustard.

Rhizofiltration is adopted for aquatic environment. So either the roots are extended to the contaminants or the contaminated water is brought to roots. Once the contact between the stable roots and water is made, the process of acclimation starts. A series of natural filters such as sand , gravels , coir , etc alongside the use of rhizomatous grasses start to absorb contaminants through their roots and store them in root biomass or transport them to stems and leaves. The plants absorb contaminants until harvested.

The yield from bioremediation field is dependent on factors such as growing time, climate, root depth, soil chemistry, and level of contamination. However, the roots significantly limit the application of the technique. Roots are unable to extract any contaminant below their rooting depths. Restricted to sites with shallow contamination falling within rooting zone of remediating plants, ground surface at the site may have to be modified to prevent flooding or erosion. 43

58 I Emergent technologies and design

Aquifer

Artificial irrigation canal

Jan

Oct

Surface runoff

Jan

Saline

April

Heavymetal contamination

Oct

July

Jan

Fresh with sediments

Oct

April

July

April

July

Waste water Gravel Sand

Sand Coir pith Sand Rhizomatous grasses

Humus

Depth equal to the length of the roots

soil/clay Gravel

Rhizomatous grasses

Sand Charcoal Sand

Preliminary filtration

Rhizofiltration

Top right: Potential sources of water in Jaiselmer Bottom left : Indira Gandhi water canal

Source : https://www.indiatoday.in/india/north/story/narendra-modi-for-indira-gandhicanal-shield-against-pakistan-111529-2012-07-29

Rhizofiltration

Dechlorination

Treated water

Bottom right : Continuous vertical flow based on constructed wetland system

Source : Chithra, Rengaraj & Nirmaladevi, Dhamodaran & Rajendran, Viji. (2017).

International Journal of Advances in Scientific Research Study on the efficiency of continuous flow-based constructed wetland system for grey water treatment. International Journal of Advances in Scientific Research. 3. 52-57. 10.7439/ijasr.v3i5.4198.

In-dune I 59

Solar desalination : High solar radiation in the dune valley can be used to desalinate the water from underground aquifer. The yield from solar stills depends entirely on the climatic parameters, geometry of the still and increasing water temperature. The concentrator effect plays a critical role to increase the water temperature almost to its boiling point in comparison to other geometries. This leads to raise the evaporative and convective heat transfer coefficient in the solar stills. Thus, the evaporative heat transfer is higher in tubular solar stills and could relatively produce more yield.

Concentric tubular solar stills use a parabolic reflective surface to concentrate the radiation on tubular stills inside in which evaporation and condensation of the saline water takes place. A system of concentric tubular solar still has the maximum yield of about 4.5l of water per m2 per day . 43 An array of these solar stills can be deployed in the dunal region aligned to the sun-path for the maximum output.

Glass tube Adsober tube Saline water Fresh water Reflective surface Insulation

Pyramidical solar still

Hemispherical solar still

Double basin solar still

Concentric tubular solar still

0

Yield (mL/m2/day)

1000

2000 3000 4000 4500 ml/m2/day

60 I Emergent technologies and design

Conclusions High radiation values in the region demands protection of water from evaporation. While, existing aquafers are naturally protected by the ground, surface run-offs and water in canal need to be shielded from evaporation. Construction of underground collection tanks and deployment of shade balls can reduce the amount of water lost to evaporation. However, the actual availability of water is also dependent on the current rate of its consumption. Since the water to canal directly comes from the endless supply from Himalayas, it is only the existing water in aquafers that face the threat of overconsumption and exploitation by current population.

Connection to Indira Gandhi Canal can significantly improve the problem of water scarcity in the region and facilitate the sustenance of population. However, construction of this connection might not be a sustainable solution for it may increase the ground water levels causing water logging and increasing salinity in the soil .45 The focus should be to control the influx of water from the canal and increase the ground water levels annually by adopting water conservation schemes.

Top left: Design of a concentric tubular solar still Bottom left : Yield of various solar still designs

Source : Thirugnanasambantham, Arunkumar & Kandasamy, Vinoth Kumar & Ahsan, Amimul & Rajan, Jayaprakash & Kumar, Sanjay. (2012). Experimental Study on Various Solar Still Designs. ISRN Renewable Energy. 2012. 10.5402/2012/569381.

In-dune I 61

2.5 Research proposal [In]Dune focuses on developing an integrated system of habitable spaces and productive landscapes amidst the unstable linear dune fields of western Thar. The two core environmental problems of continual sand influx and high radiations are mitigated by coupling traditional and proposed ecological sand stabilisation techniques at different scales. The proposal focuses on terraced development of the valley by bio-cementation of the dune slopes and plantation of trees to enhance its self-shading property. Seeking opportunity in the wind patterns of the site and deploying aerodynamic sand mitigation techniques like sand channels and deflecting surfaces, a mechanism of continual sand accumulation directly into ditches and its natural erosion is hypothesised.

Taking the advantage of sand’s low thermal transmittance and flexibility of fabricating different profiles using bio-cementation, indune habitable spaces are proposed to accommodate the growing population. All the ecological measures of sand stabilisation and deflection create an opportunity for habitable spaces and vegetation covers to thrive. To support the sustenance of both these systems, we propose to align their development with building a connection to Indira Gandhi Canal for water requirements. Procurement of water from the canal and adopting plantation and surface treatment measures lay the foundation for other succeeding techniques and resulting systems to flourish in synergy and form a holistic antidesertification scheme.

Sand stabilization strategies

Desired system qualities

Shelter belts on dune crests

Sediment free region

Terracing in dune valley

Thermal resistance

Sand channeling on terraces

Erosion control

In-dune structures

Water retention

Crop selection & planting techniques Water management strategies Bioremediation & desalination Water collection & distribution scheme

62 I Emergent technologies and design

Agricultural productivity

Sand channels & wind deflection systems

In-dune structures

Agriculture terraces

Bio-mineralized dune valley

Integration of Indira Gandhi water canal

Plantation and surface treatment measures

Above: Research components

In-dune I 63

3. Methods This section maps out the tools and systems that support various stages of design development- experiments, adaptation to design and evaluation of the adaption. Each of the computational experiment set-ups are direct or indirect adaptions from precedent studies and their translation to digital information. The digital data is evolved into series of design solutions at different scales which are then evaluated for efficiency in context to site conditions.

The global design strategies are formulated and detailed based on the evaluation of site for different environmental parameters. The input of anthropological and social data from the site visit to digital experiments make the design interventions site specific, indicating a cross medium transaction of information. Made out of local composite materials, these interventions are further detailed and evaluated for structural and environmental performances.

Research and development

Design development

Terrace development Fabrication logistics

Fabrications of profiles and global injection strategy

Sand channel distribution Microclimate study Design principals

Injection matrix orientation

Clustering and accessability Planar distribution of functions

Spatial distribution of functions

In-dune structures Site : family sizes and functions

Design principals

Geometric exploration

Material and structural studies

Aggregation of deflection systems

Deflection system

Bio-mineralized dune valley Phasing stategy

Hydrological Evaluation of exisiting resources scheme

Treatment and distribution

Radiation analysis

Design principals

Planting strategy

Plantation plant selection and planting texhniques Sedimentation study

Productive systems

Design Proposal

Indune morphology

Analysis and conclusion

Bio-mineralised Sand infrastructure

Sand channeling and sedimentation

Global Time Scales

Development of multiple settlements

Program distribution

Occupancy, social fabric and ancillary activities

3.1 Site visit

Site visit Rural character and remote location of the site enabled to get data on living conditions and problems. As desertification is a generic term, site specific issues pertaining to desertification could only be estimated by visiting it. The idea of scale of dunal fields and active traditional sand mitigation measures were documented to identify scope of interventions. (Refer to Appendix Section 8.5 for site pictures).

68 I Emergent technologies and design

3.2 Digital tools

Genetic Algorithms

LandSat Imaery

Genetic algorithms reflect the process of natural selection where the fittest/most efficient individuals are selected for reproduction in order to produce offspring of the next generation. Since criterions to develop different design elements at different stages might be contradicting to each other, genetic algorithms are used to optimise the design for these multiple objective. This technique finds its use primarily in morphology development of site.

The Landsat program is the longest-running enterprise for acquisition of satellite imagery of Earth. Since the linear dune fields of western Thar are arranged either as array of parallel lines or converging clusters of 5-8 dunes, Landsat imagery was used to get the configuration of dunal arrangement and their land elevation specific to the test site, Satto.

In-dune I 69

Forces Dead load Tiles : 0.001 kN/m2 + Wooden members

Wind Inlet 8m/s

Wi dt h

Wind lift force on lee: Dune Crest- 0.01 kN/m2 Dune valley -0.015 kN/m2

: 25 0m -

U 50 pwin -10 d 0m Tes ted

ge o

45

0m Predominant wind load: Dune crest - 0.02 kN/m2 Dune valley- 0.03kN/m2

me tr y

20m Do 50 wnw -10 0 m ind

Utilization

Pressure outlet 0 Pa

-54.6%

Velocity (m/s) 0 0%

47.6%

9.3

Computational fluid dynamics

Finite element analysis

Computational fluid dynamics is a branch of fluid mechanics that uses numerical analysis and data structures to analyse and solve problems that involve fluid flows. Since wind plays a critical role in moving the sand particles, sand deposition patterns are estimated by studying the wind patterns on the site. Based on this study, aerodynamic interventions are proposed to mitigate the sand influx.

The interventions are further evaluated based on CFD tests and wind simulations.

Finite element analysis (FEA) is a computerised method for predicting how a product reacts to real-world forces, vibration, heat, fluid flow and other physical effects. Any structure erected above the dune surface is subjected to high wind loads and self-weight. Sand deflection system made out of wood and sand based composite material are an outcome of constant FEA evaluations both at design and post analysis stage.

70 I Emergent technologies and design

Test periods: 50°C

0m -.5m

47°C 43°C

-2m

31°C

-4m

26°C

<26°C

[ Summer ] Soil Temperature

26°C

0m -.5m

4°C 20°C

-2m

24°C

-4m

26°C

<4°C

Summer solstice Summers Entire year

[ Winter ] Soil Temperature

Micro-climate analysis

Solar analysis

A micro-climate survey plays the special role of analysing the interaction between air and the materials, which helps control environmental aggression. In-dune habitation naturally facilitates exchange of heat between the air and subsoil. Micro-climate analysis is used to calculate the effect of thermal transmittance on the local temperature inside the pit and guide the distribution of spatial functions based on it.

Sunlight hours analysis is an evaluation of how many hours a testing surface (terrain or building) receives sunlight, which in theory is how much sun’s energy hits the surface. Vast spanning barren slopes of the site receive high radiations. Design interventions at global and local scale to induce the property of self-shading are evaluated based on solar analysis for hottest months and hours of the year.

In-dune I 71

4. Research and Development The section curates a series of design explorations and experiments that are interdependent to develop sand stabilisation and deflection system. Focusing primarily on development of material system, the section maps out adaptation and application of bio-mineralisation at different scales. Laconically, it lays the foundation for development of habitation system amidst shifting sands.

Based on the topographical constraints of the test site, a fabrication system is detailed for the development of selected dune valley into terraces and formulation of its global time scale. The development of the terrain is in sync with the proposed objective of introducing passive thermal technique of self-shading on the site.

Study of self-shading patterns on the terrain later inform the zoning of productive and habitable spaces across the valley. Introduction of functions onto the site demands the adoption of various aerodynamical sand mitigation techniques. Under this section, these techniques are further detailed and coupled with in-dune habitation proposal as global design strategies.

4.1 Bio-mineralisation 4.1.1 Scaling up fabrication : Matrix injection Observations and conclusions from the bio-grouting experiments done at TU Delft suggest the scalability of the technique. In order to harden a vast dunal land mass, bio-grouting should be carried out such that large sections of the terrain are hardened at once with some local variations. While the existing technique of single point injection has shown its industrial success and ability to stabilise ground, the impact of its application is local and limited to a small area. Addressing to this short coming, we propose to extend the potential of this technique by replacing single point injection with a matrix of injections, hardening a larger portion of subsurface at once.

The customised injection grid can be mounted onto grouting machine which can freely run over the dunal fields. The density of the injections in the matrix can however only be determined on site by observing the net grout spread. The grout spread from all the injections collectively should be such that it homogeneously covers the entire surface of the hardened patch, without any traces of loose unhardened portions or overly injected portions within that patch. For the experiments, we assume that the 2.4 meters tall and 100mm thick injections are arranged such that they homogeneously harden the patch.

Existing technology : Mobile single point injection

Proposed fabrication method: Mobile matrix injection

74 I Emergent technologies and design

360 o

0 - 15 m

6m + extensions

360 o

5.5m

3m

3m

Machine specifications We propose to select a machine that can withstand the load of these injections, manoeuvre over the undulating field and inject upto varying depths and at different angles. Sufficing these objectives we select mobile injection grouting drill KR 807-7G by KlemmBohrtechnik. Long and heavy drilling masts are mountable and challenging drilling positions are attainable by this machine. The machine is designed with enhanced inherent stability such that its manoeuvring and setting up times are significantly less.

The machine has a mast of 7000 mm length that can be upgraded by three lattice mast extensions of 3000 mm each. However, the maximum depth the mast can travel is upto 15000mm. As per the machine’s constraints, each patch it hardens is 3m X 3m. The machine’s crawler base has an oscillating range from +12.5° to -7° and the mast automatically positions within ±5° from the vertical in all directions. These features maximise machine’s area of impact.

In-dune I 75

0-900

Existing dune slope

350 12.50

0-600

+

7.00

Maximum slope for injection operations 150

112 o 2.9 m to 5.3m

2.9m to 5.3m

Figure: Machine injection positions

76 I Emergent technologies and design

0 to 3.2m

Machine positions Having the ability to rotate the mast, the machine can inject in all the planes between two orthogonal planes. Injecting in orthogonal planes enables the machine to develop a vertical, horizontal and inclined injection system, each covering a different area of injection due to machine’s constraints.

These shifting planes of injection change the center of gravity of the machine for different positions. The machine is designed to adjust its stability for the changing center of gravity but within the limits of the slope of ground. Ground with a slope greater than 15° enables the machine to maintain stability and inject at different planes with respect to that ground plane. The test site having a slope greater than 15° demands for flattening of the dunal flange locally (only the region that needs to be hardened) for the machine to progress and inject.

In-dune I 77

Service crane Silent piler Original dune slope

Simultaneous injection near sheet pile

Matrix and single point injection + Excavation

Removal of sheet pile + Excavtion + Cutting of hardened profile

Excavtion of loose sand + Fertile soil filling

0-15 m

0-15 m

0-15 m

0-15 m

min- 0.3m

min- 3m

3m

Indune spaces- Multi level profile

78 I Emergent technologies and design

3m

min- 3m

3m

Sand channels- Inclined profile

3m

min- 3m

3m

Plantation - porous profile

sheet piling

cut and fill

injection

excavation

4.1.2 Fabrication of different profiles Assuming that the microbial grouting can produce homogeneous hardening of sand , this method is proposed to harden various sand profiles and components. Constraint of machine width and injection depths start defining the sizes of these components and determine Fitness the functions theyobjectives could transform into. The shapes and sizes of these components play a critical role in developing sand stabilisation Bodymechanism, plan andthegene and deflection detailspool of which are covered later in this FCchapter.

1- Maximize the number of

complete hardened sites

The fabrication of these different profiles begin with piling 3m x 3m patch and flattening of hardened the sloped dune face. Similar to the terraced development 1390 in ma hilly region, the dunal slopes here too are cut and filled to develop an orthogonal stepped Generation: 9 Indiviual : 9 profile. Injection on these loose stepped profiles are carried simultaneously near the sheet piles Max available on each hardend step tosites main the homogeneity of the retaining wall. Once the surfaces have Leewardattained flank strength (after 14 days of injection), the loose sand is excavated the hardened mass is either shaped or Leeward flank-and suitable for agriculture filled with fertile soil based on the profile’s purpose.

24

In-dune I 79

0- 15m

Max injection distance : 6.65m (6.65 m)

Turning radius : 2.75m

3m

5.5m

Min injection distance : 2.3m

3m

Active injection Hardended site

4.1.3 Machine tool path and time steps The propagation path of the machine can define the hardening pattern of the surface. While injecting there is a possibility that the hardened patches could either overlap or be separated by a distance.

Either of these cases make the resulting hardened surface inefficient for there is wastage of material in overlapping and weakening and erosion of sub-surface in separation. From the endless possibilities of how a machine could hover in free x-y plane, only the trajectories based on mathematically defined 1° curves (polynomial equations with highest power as 1) suffice to these objectives. A series of tool paths are developed based on 1° curves.

Paths developed have a dimensional constraints of machine’s body, turning radius and positions of injection. Due to crawler base’s turning capability, more than one patch can be injected from the same machine position. This could reduce the time lost in moving and parking the machine for next injection position. Running of machine or other heavy equipment over the pre-hardened patches could cause cracking due to differential settlement of sand. Thus, the tool path is propagated in one direction such that there is no crossrouting for machine.

Considering that a machine runs for 12 hours a day and takes 1 hour to inject a patch at the depth of 2m 46 , injection procedure for the terrain needs to be escalated by other inputs such as increase in number of machines deployed and selection of most efficient tool path.

80 I Emergent technologies and design

Tool path objectives for material and time efficiency

Tool path trajectory

No overlappings hardened sites

1° Curve

2° Curve No gaps between hardened sites

3

3° Curve 2

1

Maxiumum sites injected from the same position

No over-running hardened sites

In-dune I 81

Injection combinations from one position

Tool paths based on 10 curves

Overlaps

1

Gaps

Overlaps

2

Gaps

5% 25%

0% 50%

1

2

Overlaps Gaps

0% 40%

1 Overlaps Gaps

0% 8%

3

2 Overlaps Gaps

1

82 I Emergent technologies and design

5% 50%

Selected tool path time steps Area injected

36 sqm

72 sqm

252 sqm

3,285 sqm

Time

4 days

8 days

1 month

1 year

21m

250m

12m

3m

6m

3m

Sinlge matrix

3m

6 hours for 15m deep injection of alginate + 6 hours for 15m deep injection of calcifying agent + 14 days of curing

Conclusions Linear tool path hardening 36 m2 of area across a width of 12 m forms highly efficient trajectory for the machine. It has the potential to harden vast spans of land for different profiles and develop a hard system of in-situ fabrication globally.

Having select this tool path which propagates uni-directionally and homogeneously packs the hardened patches, indicates sectional development of the terrain. Sectional development essentially requires deployment of several machines on different parts and steps of the dunal section. Multiple machines injecting with the same rate and at the same time could escalate the stabilisation procedure for the entire terrain and help mitigate the impact of fast shifting sand over the years.

In-dune I 83

4.1.4 Global injection scale : Dune valley Fabrication of the section starts with identification of dune valley to be developed to accommodate 2250 people. Based on selected tool path and rate of injection, it is estimated that it would take 25 years to develop the entire terrain. The continual procedure of injection for over 2 decades demands for construction of pathways for machines’ circulation around the dune profile and establishment of a machine maintenance area at the centre.

Once the ramps are constructed to access the dune slopes, the sand is temporarily retained using sheet piles. The cut and fill to form the desired sectional profile does not stop the sand from saltation. Before the machines begin injecting the sand, these steps are covered with mats to give temporary support and avoid erosion. The gridded toolpath shape the interventions all through the dune. All The steps are injected simultaneously from one end so that windward and leeward flanks are available for utilization together. Due to requirements of varying injection depths across the valley, there could be some variation in time for local sectional development.

Erosion control mat( pre-hardening application) Sheet piling Injected sites 3 x 3m

84 I Emergent technologies and design

Upto 180° U

80° Upto 180°

Area - 1.125 km2 To sustain 2250 people 1.5

km

0 Years

Selected dune valley patch

Machine maintenance Ramps( slope 1:15 )

2 Years Machine movement and maintainance

5 Years

Propogation of hardened steps

Retaing of sand and simultaneous hardening of steps across dune valley

20 Years -

Future expansion

25 injection machines

Hardened stepped dune valley profile 1.5 km long

In-dune I 85

4.2 Stepped profile Orientation of dune with respect to sun path, vast sheets of sand and plane barren surface offer no self-shading from the scorching heat throughout the year. The easiest way to introduce self-shading is by generating prominent surface texture. While the conclusions from the previous studies suggest the development of the valley in steps for easy manoeuvring of machines and escalated hardening procedure, the change from planar to stepped profile can also contribute in generating self-shading. The interplay between changing heights and widths of the steps can help control the intensity of casted shadow. Stepped terrain also facilitates easy distribution and growth of various functions across the valley.

Experiment setup The study is to transform valley into stepped profiles such that it collectively displays best environmental performance and spatial ability of incorporating varied functions. Variation in solution space can be generated by changing the heights and widths of each step.

Machine constraints of maximum injection depths and width define the limits of these variations and total number of terraces. The results are evaluated based on the shadow casted by solutions during the recorded hottest hours of the hottest months in an year.

86 I Emergent technologies and design

1 1

2

2 3

12 - 36m

3 4

5

Windward flank

Number of steps

1 - 15m

1 - 15m

6 - 36m

Leeward flank m

00

15

750m

150m

No. of Generation: 10 No. of Individuals : 100

Body plan and gene pool Fitness objectives

FC 1- Maximize the number of complete hardened sites

FC 3 - Maximize the width of each step for agricultural & habitation usage

3m x 3m hardened patch Injection sites

N

FC 2 - Maximize self shading

FC 4 - Minimize the height of steps for ease of circulation

Analysed for summer solstice , 6:00 am to 6:00 pm

In-dune I 87

Generation: 9 Indiviual : 9

Generation: 07 Indiviual : 04

Max available hardend sites

Max available hardend sites

Min step height

MaxSelf-Shading

Min step height

Max step width

Hours of shade

Hours of shade

850

850

0.02% 650

9.04% 500

9.04% 150

80.5%

88 I Emergent technologies and design

7.04% 650

500

0

Hours of shade

11.46%

9.04%

11.17% 150

78.43% 0

MaxSelf-Shading

Max step width

1.04%

10.41%

150

Min step height

850

650

500

Max available hardend sites

MaxSelf-Shading

Max step width

Generation: 06 Indiviual : 03

78.37% 0

Original dune

1500 mm

1390 m

Shadow analysis Analysis Period - May to June Time -

11:00 am to 2:00 pm

Observations Hours of shade 850

0.00% 650

0.00% 500

0.00% 150

A notable improvement can be observed in self shading behaviour of the stepped terrain versus plane dunal valley. However, as the terrain has a fixed section running along the dunal length and the proportions of verticals and horizontals are strictly constrained by the machine, no significant variations in shading values are observed within the solution space. The intensity of shading can however be further enhanced by introducing tall trees near the edge of each step for they affect the net vertical height.

Despite having the same dimensional constraints, leeward and windward steps show spatial variations between each other. Broader steps developed on the windward phase than leeward phase show greater hours under the shade than the narrower steps developed on the leeward phase.

100% 0

In-dune I 89

2pm 12:30 pm

11 am - 2 pm

11 a m

21m

15 m

Leeward flank

Area under shade - X

Leeward flank- suitable for agriculture

2pm

12: 30 pm 11

Windward flank

am

21m

15 m

Net heat gain Leeward flank > Windward flank

Area under shade - 1.5 X

Windward flank- suitable for habitable spaces

90 I Emergent technologies and design

Conclusions Variation in spatial widths and intensity of shadow broadly suggest the zoning of agricultural fields and habitable spaces across the dune valley. Due to the angle of sun between the hottest hours of the day ( 11:00 am to 2:00 pm) greater shadow is casted by the verticals of the windward flanks onto its neighbouring steps. The selfshading during these hours makes windward steps obvious choice to populate habitable spaces. For other hours of the day when selfshading is least on this side, a shading system can be installed which could also act as sand laden wind deflecting surface.

For the agricultural fields on leeward steps a choice of species can be made which can resist high radiation value and have low water requirement.

In-dune I 91

4.3 Sand channels

The sand carrying winds across the valley cannot be harnessed but alteration of their speed and directionality can be used to guide the sediment deposition. Sand channels are one such critical sand mitigation measure for they decrease the velocity of incoming wind, induce the recirculation flow around them and promote sand sedimentation into the defined ditches . 47The bimodal wind directions can play a significant role in the mechanics of sand accumulation and their simultaneous removal. While the subsidiary wind for its low velocity can drop the sand inside these channels, the faster predominant wind can be used to saltate the deposited sand.

To facilitate the saltation, these sand channels are oriented along the dominant wind direction.

Experiment : Distribution of channels Sand accumulation and removal are dependent on geometric parameters of channel’s height, width and slope. The minimum injection width and area available after plantation on the steps define a range of geometric sizes of these channels. The selection of the appropriate cross-section is evaluated on the relationship between geometric parameters and wind behaviour inside these ditches. While any wind speed lower than critical velocity of 6 m/ sec would only cause accumulation, it is important that at least critical velocity is attained inside the channels for continual erosion of deposited sand.

Dropping wind speed from valley to crest of the dune result in higher sedimentation of sand towards the crest. This varied sedimentation pattern governs the accumulation potential of sand channels for each step and their sizes. Thus, selection of one ideal cross-section is not possible. A catalogue of cross-sections are selected that maintain the critical velocity for erosion and have the potential to withhold respective sedimentation.

upwind strip

ditch

downwind strip

Fig : Sand accumulation in ditches Source : Journal of wind engineering and Industrial engineering

0-15m

Trees / infrastructure deflecting sand

min channel width: 3m

15m ( required for roots) max step width: 30m

Fig : Dimensional constraints

92 I Emergent technologies and design

max channel width: 15m

Input wind velocity 0m/s

1m/s

2m/s

3m/s

4m/s

Target wind velocity 5m/s

6m/s

7m/s

8m/s

15m

12m

9m

Width of sand channel

6m

3m width not suitable since target velocity is not attained

3m

15m

12m

10m

8m

6m

4m

2m

Depth of sand channel

In-dune I 93

94 I Emergent technologies and design

Width

Depth

15m

15m

12m

10m

9m

10m

6m

8m

Conclusions While the quantification of sand inside the channels is beyond the scope of this work, the distribution of sand channels across the dune valley is based on the qualitative assessment of sand deposition pattern. For the wind to funnel through the channel, it is important that the cross-section is properly shaped. Surface irregularity could cause generation of vortex locally, which holds for high sedimentation levels. Thus, cutting of sand channels post injection and excavation needs to be done with high precision.

Since the functioning of these sand channels are dependent on wind, they might not remain active throughout the year. For seasons when the valley receives rainfall or the air is too heavy, these channels would only function as accumulation ditches.

In-dune I 95

4.4 In-dune structures Aiming to utilise the abundant sand resource available in Thar, we propose the development of in-dune, in-situ habitable spaces.

Occupying the interiors of a dune can display several environmental and functional benefits which can enhance living conditions in context to arid biome. The adaptation can facilitate heat exchange between the structure and dunal sub-soil, which in turn can significantly lower the temperature of inhabited spaces. In-dune habitation minimises the area exposed to the hot winds and sedimentation caused by their dropping velocity. Adoption of a deflection system with these spaces can help achieve a greater sediment free area between structures.

Having to occupy a dune involves heavy ground manipulation and a radical shift in structural thinking, away from pre-fabricated construction and more towards localised cementation of granular material . 48 In the adopted matrix injection system, we propose to inject at different levels within the 3m X 3m grid. For fabrication of foundations and walls we adopt application of multiple injections and single point injections at different depths respectively. Locally procured secondary material is used to stack additional floor slabs and roof over the excavated pits, details of which are discussed in later sections.

Ground level

Hardened surface

Figure : Heat exchange through hardened walls

SW winds Ground level Courtyards and nurseries

Figure : Sheltered public spaces and nurseries

96 I Emergent technologies and design

Ground level Matrix injection at multiple levels

Foundation rd

dwa

Win

k flan

Ground level Linear array of Single point injectios

Walls 0m 5m 10m 15m

Ground level Excavation of loose sand

Hardened profile Roof

3

x 3m

inje

ctio

rid ng

(alternate material)

d san d e t nd ava Exc ned sa d de Har ed san n i a Ret

Ground level

Floor slab

(alternate material)

Excavated pit Figure : Fabrication strategy and components of in-dune structure

In-dune I 97

4.4.1 Depth of injection Micro-climate

Experiment Setup

Micro-climate is a measure of surface and air temperature, humidity, wind speed and solar radiation. Microclimate analysis is ensued to simulate the liveability of excavated habitable spaces in terms of thermal comfort. The major parameters such as depth of excavation, peripheral wall thickness, soil temperature and value of subsoil’s thermal conductivity are meant to regulate the thermal performance of the spaces based on their levels of exposure to the natural environment. The opening of the pits influence the convective capacity of the space’s air volume due to its exposure to direct solar radiation. Thermal mass and opaque conductivity regulate the nature and degree of heat transmission through the peripheral wall assemblies. The same wall properties work with low U-values to inhibit high degrees of thermal exchange and permit more regulated living conditions for the occupants.

The study aims to record the range of temperatures inside excavated pit for varying wall thickness and depth. Controlling these parameters alter the thermal transmittance or u-value of the subsoil and bring significant changes in the micro-climate. The evaluation is based on the combination of depth and wall thickness that modify the air temperature such that it falls under the comfort band of Jaisalmer for respective seasons. The machine constraint of injecting upto the depth of 15 m marks the limit to test these variations. The wall thickness is however ranging between 0.1 m to 1 m.

The study is conducted separately for summer and for winter season.

To record the temperature variations, the surface temperature of the surrounding soil are calibrated based on precedent data 49 for both the seasons.

As the temperature variations are extremely high for the site, the comfort band for the region has higher values than any other biome.

Even small thermal changes inside these pits can be significant to initiate the growth of plants and ensure human comfort. winter

19.69°C

24.72

18°C

20°C

26.69°C

summer

31.72°C

30°C

40°C

Comfort Band in Jaisalmer (Based on ASHRAE - 55 ) Psychrometric chart

Humidity ratio ( kg water/ kg air)

Jaisalmer, Rajasthan 1 Jan - 31 Dec 1:00 to 24:00

Operative temperature

98 I Emergent technologies and design

G.L Properties of hardened sand :

Thickness(t) of hardened wall

Depth (d)

Thermal conductivity 2.91 W.m-1.K-1

Injection level

Fig: Section thorough the excavated pit

Density 2.670 kg/m3

Temperature (T) inside the pit

Specific Heat 840 kJ. kg. K−1

Fig: Caliberated soil temperature Source : . P. GUPTA (1986) Moisture and thermal regimes of the desert soils of Rajasthan, India, and their management for higher plant production, Hydrological Sciences Journal, 31:3, 347-359

50°C

0m -.5m

47°C 43°C

-2m

31°C

-4m

26°C

[ Summer ] Soil Temperature

<26°C

26°C

0m -.5m

4°C 20°C

-2m

24°C

-4m

26°C

[ Winter ] Soil Temperature

<4°C

In-dune I 99

Microclimate Temperature (°C)

42

37

[ Summer ]

32

27 1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Depth ( m ) 15.6

Microclimate Temperature (°C)

15.4 15.2 15 14.8

[ Winter ]

14.6 14.4 14.2 14 1

2

3

4

5

6

7

8

9

10

11

12

Depth ( m )

Injected wall thickness:

100 I Emergent technologies and design

0.3 m

0.6 m

0.9 m

1.2 m

1.5 m

13

14

15

Conclusions Ground coupling serves as a proficient thermal comfort enduring technique. The technique shows significant difference for the summer season, for there is a flow of heat from interiors of the pit to subsoil. When the temperature outside during harsh summers is 50°C, a temperature drop of 20°C can be achieved inside the pit.

This temperature is observed to start equalising after a depth of 9 to 12 m. Despite having greater injecting capabilities, the injection depth of grouting machine can be limited to 12m to save time and material. For winter season, there is a reverse flow of heat from subsoil to the interiors of the pit. This increases the temperature of the pit instantaneously to about 15-20°C but shows no significant variation across different depths. (Refer to Appendix Section 8.4 for experiment results).

These temperature variations for varying depths serve as an input to zone different functions inside the excavated pits based on their respective thermal requirements. The details of these functions and arrangements are discussed in succeeding chapters.

In-dune I 101

4.4.2 Orientation of injection matrix Experiment setup

Observations and conclusions

As seen in the ‘Stepped Profile’ section earlier in this chapter, selfshading is a passive thermal technique which can bring about a notable drop in temperature. Exploring this technique at a more local level, the following experiment is set to determine the orientation of the injection patch such that it casts maximum shadow after excavation. For all given intensities of radiation, there is only one unique angle for excavated pit that casts maximum self-shading. A catalogue of angles varying at an interval of 10° to the global EastWest orientation are tested for maximum value of self-shade on the base and walls of the pit.

Changing angles show variations in the overall shadow cast inside the excavated pits. While for different orientations the base of the excavated pits showed no significant difference in the shadow value, notable differences in the values were observed for the walls. Thus, excavated peripheral walls and injected interior walls become the prime mode of passively bringing in thermal comfort.

The resulting angle of orientation in turn governs the global angle of propagation of injection machine and interior layout of different functions inside the habitable excavation.

Since this angle of orientation is not parallel to the angle of predominant wind, excavated pits meet the sand channels and edge of the stepped terrain at an angle. This prohibits the injection of complete 3m X 3m patches along the edges of each step of the terrain. The patch shaping the sharp edge of these steps are hence injected separately in an injection pattern specific to its area and shape.

N

Experiment setup

α Ground level 3m

3m Injection level

1st June to 31st July 6:00 am to 6:00 pm

3m Plan

102 I Emergent technologies and design

Shadow analysis period:

Section

Angle about East-West axis

Shadow on base

Shadow on walls

Hours of shadow Hours

460

300

200

150

0

α=0 Total surface area

Hours

61.87% 19.92% 9.38% 8.81%

460

300

200

150

0

α = 10 Total surface area

Hours

61.62% 19.24% 9.77% 9.82%

460

300

200

150

0

α = 20 Total surface area

Hours

62.23% 16.88% 9.10% 11.76%

460

300

200

150

0

α = 30 Total surface area

Hours

61.65% 16.72% 9.02% 12.59%

460

300

200

150

0

α = 40 Total surface area

Hours

59.77% 18.97% 9.0%

460

300

200

12.45%

150

0

α = 50 Total surface area

Hours

59.46% 22.56% 5.16% 12.81%

460

300

200

150

0

α = 60 Total surface area

Hours

61.43% 20.93% 6.0%

460

300

200

11.82%

150

0

α = 70 Total surface area

61.87% 19.92% 9.38% 8.81%

In-dune I 103

4.5 Deflection system Building inside a dune minimises the contact of spaces with sand laden winds and yet does not ensure complete sediment free spaces between in-dune structures. Rather, habitable excavations like sand channels act like sand accumulation ditches. Based on the concept of Jet Roof50, a deflection system is developed which acts like additional roofing system over the habitable spaces. Aerodynamic based research suggests four principles of designing these roofsacceleration of wind speed along windward slope, lifting off sand particles , deflection over the roof and deposition into sand channels.

Indicating a synergic mechanism of continual sand deflection and removal within sand channels.

The effectiveness of the deflection system is based on direction and velocity of the wind and geometry of the deflecting surface- shape, width and height. The bimodal wind directions redistribute the access routes and openings to habitable spaces and suggest the anchoring of edges of the deflection surfaces facing their direct impact. The following sections are a detailed account of developing this system.

Roof Design principles Deflection of sand over habitable spaces, towards the sand channel Openings facing away from the direction of sedimentation Minimum direct solar exposure on spaces under the roof Minimum wind load and lift forces on the roof

104 I Emergent technologies and design

E

Deflecting geometry

N

S Sa n dC ha

nn el

Access and openings

No openings

W

In-dune I 105

4.5.1 Geometric exploration Experiment 1.1 Different geometries display different behaviour when placed in the direction of dominant wind. The aim of the study is to observe the changing wind behaviour from over the surface of the roofs to the succeeding path of the wind. The evaluation of the results are based on the wind speeds attained and the lengths of the effected zones generated in proportion to the height (X) of respective testing geometries. The same geometries tested for shearing wind behaviour are also tested for surface load that the wind inculcates.

The angle of the slope is a critical factor affecting the efficiency of sand deflection. While this study helped to select roof shape based on the nature of impact zones created for respective geometries, it is the study of angle of inclination/slope of the selected shape and the resulting impact zones that start to define the details of roof geometry.

Minimum load on surface [Structural performance]

Max height of reduced velocity zone

X

2X

Wind velocity near surface of roof

Reversed eddies/ turbulent zone

Reduced velocity zone (velocity below 6m/s)

Velocity over 6m/s

Minimum

Maximum

Least sedimentation on the roof

Human comfort

Human comfort, sedimentation free zone

Evaluation criteria

Property / Logic

None saltation will happen in this zone.

Unless wind blows from another direction

106 I Emergent technologies and design

Legend

Input velocity 0 m/s

6m/s

9.3m/s

Upwind and downwind flow Velocity on the surface

Dome

Turbulence zone

1.29x

Reduced velocity zone

2.79x

Height of reduced velocity zone

0.55x

Velocity on the surface

Vault

Turbulence zone

1.74x

Reduced velocity zone

3.51x

Height of reduced velocity zone

0.73x

Velocity on the surface

Cone

Turbulence zone

.68x

Reduced velocity zone

1.90x

Height of reduced velocity zone

0.65x

Velocity on the surface

Gabled

Turbulence zone

1.29x

Reduced velocity zone

7.40x

Height of reduced velocity zone

0.91x

Velocity on the surface

Pyramidal

Turbulence zone

.68x

Reduced velocity zone

1.44x

Height of reduced velocity zone

0.57x

Velocity on the surface

Wedged

Turbulence zone

1.29x

Reduced velocity zone

3.60x

Height of reduced velocity zone

.92x

In-dune I 107

Surface wind pressure Pressure (pa)

20.88

-23.45

Dome

Pressure (pa)

27.61

-28.56

Vault

Pressure (pa)

24.91

-32.67

Cone

Pressure (pa)

28.70

-25.13

Gabled

Pressure (pa)

19.45

-22.93

Pyramidal

Pressure (pa)

Wedged

108 I Emergent technologies and design

-23.68

28.82

Input velocity

Legend 0 m/s

6m/s

9.3m/s

Inclination of pyramidal geometry

Velocity on the surface

10°

Turbulence zone

0.2x

Reduced velocity zone

0.29x

Height of reduced velocity zone

0.73x

Velocity on the surface

20°

Turbulence zone

.47x

Reduced velocity zone

.43x

Height of reduced velocity zone

0.73x

Velocity on the surface

30°

Turbulence zone

0.59x

Reduced velocity zone

0.63x

Height of reduced velocity zone

0.17x

Velocity on the surface

40°

Turbulence zone

0.80x

Reduced velocity zone

0.67x

Height of reduced velocity zone

0.21x

Velocity on the surface

50°

Turbulence zone

0.94x

Reduced velocity zone

0.87x

Height of reduced velocity zone

0.29x

Velocity on the surface

60°

Turbulence zone

0.54x

Reduced velocity zone

0.76x

Height of reduced velocity zone

0.59x

In-dune I 109

Conclusions Amongst all the testing geometries pyramidal form is an ideal choice for it is extremely aerodynamic (due to equal sloping of the surface) and can withstand powerful winds in comparison to others. For a pyramidal roof, alteration of base angle significantly and specifically can change the velocity and pressure field. Such alterations directly affect the characteristics of wind loading on the surface.

Furthermore, it was also observed that the changes in flow field are more pronounced for base angle variations of shallow or medium steep pyramids than for steep pyramids51. Variation of inclination angle between 20° and 30° has the ability to create least turbulence and ensure maximum human comfort. The angle of inclination thus determines the effect of wind on the ground and range of sand deflection.

30° 20°

Sand channel

110 I Emergent technologies and design

4.5.2 Orientation of deflection geometry Precedent studies suggest orthogonal orientation of deflection systems in the direction of prevailing wind52. However, the dual directions of the blowing wind on the site cannot support orthogonal orientation of roof to the predominant wind, for it would facilitate sedimentation in the shielded spaces. The circulation of wind demands a roofing system oriented at such an angle that it effectively deflects the sand from both the directions. The orientation angle together with the angle of inclination determines the deflection and accumulation of sand.

Experiment setup

N

The study aims at determining the orientation angle of roof such that it deflects the blowing dual winds. Deflection system is not studied independently for both the directions, rather a resulting vector of dominant and subsidiary wind vectors is used as an input to conduct the experiment. Since the quantitative assessment of deflected sand cannot be made, a qualitative judgement is made by observing the net deflected vectors in the direction of sand channels. The angle of orientation of roof is measured with respect to the global x-axis. The roofs are tested for orientation angles from 90° to 180°.

α

S.W wind

Deflection efficiency : Cumulattion of

angles between SW wind and deflected wind vectors

Sand channel

In-dune I 111

90°

Deflection Efficiency

Deflection Efficiency

115°

Deflection Efficiency

125°

135°

Deflection Efficiency

145°

Deflection Efficiency

155°

112 I Emergent technologies and design

Deflection Efficiency

Deflection Efficiency

165°

Deflection Efficiency

175°

Deflection Efficiency

180°

Input velocity

Legend 0 m/s

6m/s

20m/s

Observations and conclusions Since the input dual winds can vary locally due to environmental reasons, a range of orientation angles are taken into account to develop the roofing cum deflection system. It is observed that roofs oriented between 130 to 135° to the global x-axis deflect most of the wind vectors towards sand channels.

Geometric parameters of shape, angle of inclination and orientation can define an efficient deflection system in computational realm.

However, other parameters existing in real world such as material and texture of deflecting surface, atmospheric temperature and moisture content of the air can significantly alter the deflection procedure. While these can only be tested physically, the values from digital experiments give a foundation to formulate the physical tests.

In-dune I 113

4.5.3 Wind lift mitigation Air flow over a building creates a positive pressure zone on the upstream side and negative pressure zones (cavities or eddy zones) on the roof. This pressure difference causes the roof to face an uplifting force. In places where the wind speeds are close to or greater than 17 m/s these uplifting forces can cause immediate damage to the roof.

Despite the fact that pyramidal shapes are found with least uplift in comparison to other shapes53, any internal pressure would make the anchoring and sustenance of even pyramidal roof difficult. However, creating openings on the surface can lower the pressure difference significantly and mitigate the uplift.

Experiment setup The study aims at determining the configuration of openings on the roof surface such that pressure difference between the upstream and downstream is minimised and the uplift is mitigated. The size of the openings and surface area of each roof slit is informed by the roof material. At this stage only the pressure impact of overall distribution of openings are tested. Inclination angle and orientation of each subpart of the roof even after introducing openings does not change.

Conclusions Introduction of openings have significantly lowered the internal pressure on monolithic roof. Irrespective of having greater openings on windward or leeward side of the roof, internal pressure is reduced the most in equal distribution of the openings. Generation of openings have an added advantage of introducing light and ventilation inside excavated the habitable spaces.

Building of a roof in parts narrows down the fabrication choices for roof installation. Instead of having a monolithic material spanning over the entire excavation, part by part construction with fixing mechanism needs to be adopted. The details of roof material and fabrication are covered in succeeding chapters.

114 I Emergent technologies and design

Deflection geometryd with varying porosity

Wind lift on lee Static Pressure -(Pa)

-28.7

8m/s No openings

-38.6 Wind lift reduction : 61%

Static Pressure -(Pa)

-11

Density of openings

-15

Wind lift reduction : 35%

Density of openings

Static Pressure -(Pa)

-15

-25

Wind lift reduction : 35%

Static Pressure -(Pa)

-15

Density of openings

-25

In-dune I 115

116 I Emergent technologies and design

5. Design Development This chapter is an adoption of principles derived from the experiments done in the previous chapter and adapting their applicability in the designing process. The section particularly focuses on detailing the new in-dune habitable system and its supporting sand deflecting roofing mechanism, which is optimised for least material input and maximum structural performance. The section overviews the phased development of the terrain based on correlative calculations of productive yields (agricultural and hydrological) and area requirements of the target population. Lastly, it is a detailed account of agricultural system and its dependency on proposed hydrological scheme.

The new habitation system is an adaption of site-specific settlement pattern coupled with principles that are derived from previous section for displaying best environmental performance. The sustenance of the habitable spaces is critically dependent on development of hydrological and agricultural system. Each of these systems have challenges pertaining to adaptation to the site and distribution across the dunal valley.

In-dune I 117

5.1 Habitable spaces 5.1.1 Clustering and accessibility Post zoning the habitable spaces and agricultural fields on windward and leeward sides respectively, accessibility routes are laid on each step of the terrain. While planar walking routes help in intra-step circulation, ramps are laid for inter-step circulation. On the windward side, for intra-step movement access routes are oriented along the subsidiary wind direction. This orientation helps the sand deposited by dominant wind in the access routes to get saltated directly into the sand channels by the force of subsidiary wind when it attains the critical velocity (6 m/sec).

These access routes divide each step into sub-plots where habitable spaces can populate in clusters. Division and sizes of these subplots are dependent on the inter-step walkability. Average walkable distance for a neighbourhood under favourable environmental conditions is considered to be 400-500 m. High radiation and fast blowing winds of the site make walkability tedious and suggest its reduction. We propose a 200m inter-step walkability, which also defines dividing distance between sub-plots (or distance between intra-step access routes). As the intra-step access routes are subjected to sand accumulation due to deposition by predominant wind, they are redistributed along the valley based on qualitative assessment of sedimentation pattern. Higher sedimentation volume requires greater number of ‘channels’ for accumulation. The redistribution causes a change in the sizes of sub-plots, making them range from 200m to 75m from valley to crest.

118 I Emergent technologies and design

Access from leeward faces

N

Maxium cluster plot size derived by minimum walking distance between two steps Step height: 15m Ramp slope 1:12

Equal distribution of staggered access channels based on walking distance cluster length : 200m each

Redistribution : Higher density of access channels near dune crest cluster length : 200m to 75m

In-dune I 119

5.1.2 Programmatic adjacencies Each sub-plot accommodates multiple housing units in clusters. Each of these units are an aggregation of different programs specific to the site. Based on the observations made on spatial arrangements from the site visit, these programs can be categorised into Primary, Secondary and Tertiary functions. As courtyard housing is typical to the site, they are categorised as primary function around which other secondary and tertiary functions are spatially arranged directly and indirectly respectively. Courtyards play a significant role for being a benefactor of social gatherings and other outdoor activities. Based on the family sizes (average family size- 6.2) the courtyards are categorised as small, medium and large. Each of these have corresponding list of functions, their numbers and sizes.

Communal spaces outside units Image copyrights : Nick Fleming

120 I Emergent technologies and design

In order to support growing family size within one unit we introduce Expansion Units as a part of programmatic strategy which can be brought to use as and when the area requirements increase.

The walls and floor slabs of these are injected along with the other active functions of that unit.

However, these spaces remain unexcavated till spatially not required. As the injection of all the spaces are carried out in patches of 3m X 3m, the area of each space is determined in multiples of 9 m2. Translating the above information into computational realm, each of the injection patch is referred to as ‘Cell’. Computationally each cell stores information of its order and size corresponding to its function. As an input to the further experiments on spatial arrangement, an aggregation hierarchy and a few programmatic adjacencies of these functions are defined in the table shown.

Table: Distribution of functions based on different family sizes Family Sizes Functions

2 to 3

4 to 5

6 to 8

7-9 cells: 63-81 sqm

10-12 cells: 90-108 sqm

1

1

2

1 small

1large

1 large

1

1

2

Cell size = 3x3m = injection matrix open space- Primary

Selected Cell

Varying range of selected cells

Closed spaces- secondary

Verandah/Semi-open public space

Large Kitchen

Small Kitchen Adjacency 01

Store

2 large, 2 small

1 large, 1 small Large Bedroom

3 large, 2 small

Small Bedroom Adjacency 02

Toilet

Living Room Semi-open spaces-tertiary

Hierarchy of Functions

4-6 cells: 36-54 sqm

Courtyard

1

1

2

1

1

1 large

1 large, 1 small

1 large, 2 small

1 large, 1 small

1

2

2-3

1

1

1

Expansion Units

Plant Nurseries

Secondary Connection

Unit expansion strategy ( Transition of spaces as families expand )

Treated Surface

Unexcavated sand

Hardened walls and floor slabs

Area excavated for use

Area excavated for use

In-dune I 121

5.1.3 Planar aggregation of programs Arrangement of programs locally within each unit and arrangement of these units into clusters collectively form the global aggregation mechanism within each sub-plot. Semi-open spaces, specifically Verandah form the inter-unit connections. Hierarchy of functions and spatial adjacencies coupled with rules related to zoning, orientation, stacking and connections form global aggregation logic.

While the Units are an adaption of traditional courtyard housing, the spatial arrangements of functions around courtyards are aimed at adapting to the environmental conditions of a desert to display best performance.

Experiment setup From the varying plot sizes of lengths 75-200m across the valley, the study aims to develop local and global programmatic arrangements of medium and large courtyards on a 100m long plot. The rule based aggregation at both the levels happen simultaneously to form a network of open, semi-open and close spaces. While rules and objectives let the aggregation solutions inherently display different degree of performance for generic environmental conditions in a desert, the solutions are further evaluated for site specific environmental constraints.

Store

cell size

- Closed Space

3 x 3m - 9 sqm(1 cell)

Area available 2,400 sqm Area per person 67sqm Population 34 pax Family sizes 5 to 8

Body plan : available cells in a cluster Cell grid oriented at 300 from east-west axis

Large-Medium Courtyards |Pareto front solution 122 I Emergent technologies and design

Aggregation rule / Gene pool Rule 01: Zoning Cells can only be selected in zones that are based on the distance from the courtyard

Fitness objectives I: Primary (Courtyard) -Aggregation Point for other functions II: Secondary functions -Direct access to Primary function

FC 1- Maximize perimeter This would result in a greater sufaces area available for the heat exchange between the spaces and subsoil

III: Tertiary functions -No direct access to Primary function

Rule 02: Orientation

N

Preference to oreint along the longest side to enable more natural light into spaces

FC 2- Maximize closed spaces located towards north

N

To reduce solar heat gain

FC 3- Maximize plan nurseries located towards north

Rule 03: Stacking Stacking of secondary functions on non-availability of cells

To reduce solar heat gain

FC 4- Maximize connectivity between courtyards

Rule 04: Connections Courtyads can be connected only through semi-open spaces

To reduce solar heat gain

Common social space between two

Open Space (courtyard) Closed Space Semi- Open Space

Selected Phenotype In-dune I 123

Pareto front solutions No. of Generation: 30 No. of Individuals : 900

Generation 29 Ind 05 FC1

FC4

FC2

FC3

Generation 29 Ind 29 FC1

FC4

FC2

FC3

Selected Phenotype Generation 29 Ind 20 FC1

FC4

FC2

FC3

124 I Emergent technologies and design

Generation 29 Ind 16 FC1

FC4

FC2

FC3

Selected phenotype

Best of FC 4: Maximum connectivity between courtyards Coherency of units Selected solutions from all aggregation types

Conclusion

Maximum number of courtyards protected from pre-dominant wind

Pareto front soultions

Over the generations, the adaptation to the objectives have resulted into a coherency of different spatial arrangements and functions.

Each of the emerged solutions have ‘coded’ potential to respond to the environmental needs at different intensities. The selection of final solution is however based on sand influx pattern on the site and value addition of increased social interactions. The selected solution has maximum number of courtyards that are naturally shielded from sand laden bimodal winds by the assembly of closed secondary and tertiary functions on its periphery. Having maximum number of connected units, the selected solution forms a coherent aggregated mass with opportunity for increased social scheme.

While the spatial aggregation addresses to planning of spaces, a volumetric assembly of these functions is needed to detail and define relationship and circulation between these spaces.

In-dune I 125

5.1.4 Volumetric aggregation of programs Stacking and configuration of planar functions from the previous experiments demand for volumetric arrangement of spaces for human inhabitation. Every space demands a unique thermal condition and spatial quality. Based on the data from microclimatic studies at varying depths, these spaces are placed for their corresponding temperature/ thermal requirements. While function like courtyard which serves as central space to other functions are injected in parts and at different levels to connect all other spaces, functions like unexcavated expansion units and bedrooms are placed at the bottom of excavation pit to provide most thermal comfort.

The configuration and changing volumes of these functions play a significant role in creating buffer spaces like balconies and shaded pathways.

Experiment setup The changing volumes and their arrangement determine the extent of excavation of each sub-plot and the circulation within it.

At both local and global level for the sub-plots the study aims to derive most suited configuration that provide thermal comfort to the inhabitants by activity based placement of functions and selfshading respectively. Since the maximum heat gain happens from the roof in a structure, the evaluation is based on the heat gain value of the spaces directly exposed to the sun.

126 I Emergent technologies and design

Gene group : Levels 00 m

Living -3 to -9 m

Kitchen & store

-6 to -12 m

Toilets Bedrooms

Expansion units

Semi-Open Spaces

-03 m

-Verandah -Plant nurseries -Secondary Connection

-9 to -12 m

-06 m

Courtyards

-09 m

-12 m

Gene group: Scaling 3 - 4.5 m

3 - 4.5 m

2.5 - 3.5m 3 - 4.5 m

5 - 7.5 m

Body plan and Genepool

3 - 4.5 m

Fitness objectives

FC 1- Minimum excavation For material and time efficiency

FC 3- Max. surfacea area in contact with earth To enable heat exchange

FC 2- Min. level difference

FC 4- Max. self-shading

For ease of ciculation

In-dune I 127

Pareto front solutions

No. of Generation: 20 No. of Individuals : 400

Gen 19 Ind 01 FC1

FC4

FC2

FC3

Avg radiation : 560 kwh/sqm Total radiation: 1.43 x 106 kwh

Gen 19 Ind 07 FC1

FC4

FC2

FC3

Avg radiation : 570 kwh/sqm Total radiation: 1.44 x 106 kwh

Gen 19 Ind 14:

6

FC1

FC4

FC2

FC3

Avg radiation : 565 kwh/sqm Total radiation: 1.35 x 106 kwh

Radiation analysis 01 March- 30 September 800 kw/m2

128 I Emergent technologies and design

0 kw/m2

Gen 19 Ind 03 FC1

FC4

FC2

FC3

Avg radiation : 535 kwh/sqm Total radiation: 1.28 x 106 kwh

Gen 19 Ind 17 FC1

FC4

FC2

FC3

Avg radiation : 572 kwh/sqm Total radiation: 1.40 x 106 kwh

Gen 19 Ind 18 FC1

FC4

FC2

FC3

Avg radiation : 545 kwh/sqm Total radiation: 1.30 x 106 kwh

Radiation analysis 01 March- 30 September 800 kw/m2

0 kw/m2

In-dune I 129

Gen 19 Ind 03 FC1

FC4

FC2

FC3 00m -04m -08m -12m

130 I Emergent technologies and design

Conclusion The peripheral volumetric assemblies around a courtyard cast shadow on the it and makes the space usable for social activities. However, the size of courtyard also plays a significant role in determining the amount of heat that the space can gain when exposed to solar radiation. Smaller courtyards are better shaded by peripheral spaces for the spaces are not elaborately spread like those in larger courtyards. As the radiation value varies across the windward slope, the distribution of small, medium and large courtyards along with their corresponding peripheral spaces are governed by this concept.

By controlling the heat gain through adopting passive self-shading technique, functions like plant nurseries can be given a suitable environment for saplings to thrive.

The variation in distribution of courtyard types also generates variation in population density on each step. This variation further governs the yield requirements from agricultural plots and distribution and density of different tanks involved in forming hydrological system on the site.

In-dune I 131

Structural frame

Gum arabic tree/ Vachellia nilotica

It is strong, hard and tough and locally used for bodies and wheels of bullock cart, agricultural instruments, tool handles, and well curbs

5.2 Deflection system: scalability 5.2.1 Materiality The part by part construction of roofing system as suggested for mitigating uplifting wind force demands for strong structural and material system. Existing use of locally produced material by the locals imply the applicability and durability of these materials in combating adverse weather conditions for over the years. The roofing mechanism has two main components- structure and cladding system. Each of these components are proposed to be developed using locally produced composite material.

Babul

Cladding components

Fine sand Fine in texture and low cost building material. Used to add bulk strength, stability, binding and levelling of dry surface

Based on the material study, we opt to develop sand and biopolymer based cladding system with wooden structure. From the noted success of getting uniform compressive strength by casting sand composite in moulds, we propose dry-mixing mould casting of the composite into tiles. As these tiles will be directly exposed to blaring heat, they need to be durable and provide thermal insulation. To enhance the durability only desalinated water shall be added to the composite while fabrication. Addition of natural fibres into the composite increases the thermal insulating ability of the material.

Coconut fibres Adds toughness and tensile strength, resists cracking and spalling

For the development of structure, we propose to use wood from tress which are planted specially to support the fabrication procedures on the site. Since everything is fabricated on the site and there is no shortage of skilled labour for wood work, we propose to increase community participation by involving the locals in the process of development.

5% Sodium alginate sol.

Binding agent .Imparts insulation from fire and resistance to heat.

Insulation Natural jute fibre Natural insulator

132 I Emergent technologies and design

Distance of production from site 0 km Large cube size

7091km Small cube size

Material combinations Sand & biopolymer components (fibre reinforced), interlocking self-supporting roof

Sandstone

Metal frame and sheets

Hessian + sand & biopolymer fibre reinforced plaster, supported by wooden posts and tension cables.

Clay tiles & Wooden structure system

Concrete

Sand & Biopolymer tiles(fibre reinforced) + wooden structure

Tatched roof + wooden structure

ETFE single layer

In-dune I 133

5.2.2 Structure Primary structure comparative study Spanning over atleast a distance of 3m (Minimum planar dimension of injected space), the roof is subjected to three types of loads- Wind load, Wind Lift load and Dead load or self-weight of wooden structural members and cladding tiles collectively. These loads subject the roof to torsion and shear forces for which the roof is anchored in the directions of prominent and subsidiary winds. The roof demands for a strong structural system which can withstand these loads.

Three different structural systems are tested for the same loads and evaluated for least utilisation values. While it is observed that there is no significant difference in how these systems behave under these loads, the selection is based on least material requirement.

Force Dead load of tiles : 0.001 kN/m2 + Dead load of structure Anchored edge Force Wind lift Load : 0.02 kN/m2

Force Wind Load : 0.02 kN/m2

134 I Emergent technologies and design

Structure utilization : Material mass :

53.9%

24276 kg

Single cantilevered truss

Vertical supports only

Multiple trusses + supports

-53.9%

-51.4%

-54.6%

0%

0%

0%

47.2%

48.1%

47.6%

Structure utilization : Material mass :

51.4%

23627 kg

Structure utilization : Material mass :

54.6%

25028 kg

In-dune I 135

5.2.3 Material optimization The forces acting on the roof are either exerted by the nature or are self-inculcated. These forces increase with increasing wind speeds and increasing roof spans. Wind speed decreases across the dunal crosssection from valley to crest, indicating a similar trend of decrease in wind loads. Amongst all the exerting forces, the deadloads can be controlled by material optimisation. Material optimisation demands that based on the available material thicknesses in the market, the structure is assembled in such a way that each sub-structural element withstands maximum load for least material input.

Experiment setup The study aims to optimise the material input required for construction of sub-structural elements such that they display best structural performance for changing spans between 3m to 21m.

Changing the value of loads from valley to crest and anchoring the roof in the direction of bimodal winds, The results are evaluated based on mass of the structure.

W

ank

rd fl

a indw

136 I Emergent technologies and design

Available wooden member sizes Primary truss principal rafter:

20 to 30 cm

Primary truss strut:

20 to 25 cm

Secondary truss principal rafter:

10 to 20 cm

Secondary truss strut:

10 to 15 cm

Battens for tiles:

5 cm

Forces Dead load

Tiles : 0.001 kN/m2 + Wooden members

Wind lift force on lee:

Dune Crest- 0.01 kN/m2 Dune valley -0.015 kN/m2

Predominant wind load:

Dune crest - 0.02 kN/m2 Dune valley- 0.03kN/m2

Fitness objectives FC1 : Minimize material mass FC2 : Minimize utilizatiion FC3 : Minimize displacement

Simulation run for each span from 3 to 21m Phenotypes for each simulation 100 (10 Gens 10 ind/Gen)

In-dune I 137

rd dwa

Win

k

flan

138 I Emergent technologies and design

125 %

138 %

Roof spans more than 18m not suitable with the available member sizes

21m

70 %

55 %

18m

45 %

57 %

15m

37.2 %

12m

Roof spans

42 %

24.1 %

27.6 %

Conclusions 9m

26 %

13 %

6m

11%

6%

3m

Loads for 11m/s at dune valley

Loads for 8m/s at dune crest

Wind load

Based on the qualitative assessment of sedimentation pattern across the valley, the volume of saltated grains hitting the roof surface increase from valley to crest. The increasing volume demand for larger surface areas to deflect the sand grains into the sand channels. As the roof spans increase from valley to crest their material requirement and resulting dead load values also increase.

These increased loads increase the stress percentage (Utilisation) in each sub-structural member. Utilisation greater than 100% indicate high breaking probability of these component when subjected to testing forces.

Utilisation value overs 100% for roof spans larger than 18m marks the upper limit of feasible roof spans for the available material cross-sections in the market.

The total number of roofs populating over a cluster are dependent on the cluster size and the roof spans corresponding to that cluster. The details of these populating roofs and the rules of their aggregation area discussed in the next section.

Target utilization 138 %

-70%

70%

-138 %

In-dune I 139

5.2.4 Aggregation of deflecting geometries The roofing system plays a dual role as a wind deflecting mechanism and as thermal insulator. Each of the cluster corresponding to its size, location and sedimentation pattern on the windward side has a unique range of spans for these roofs. While all the geometric explorations of the roof done so far (angle of inclination, orientation and density of openings) make roof efficient to deflect the wind and withstand its pressure, their arrangement in a group over a cluster plays a significant role in determining the state of sedimentation and heat gain inside the excavated pits. Irrespective of the arrangement of roofs on the downwind side, it is critical that windward sides are completely sheltered by deflecting roofs.

Experiment setup The study aims to aggregate roofs over the developed cluster such that they comply to their primary objectives of deflection and insulation.

The location of the sub-plot on the terrain and corresponding sand influx suggest roof spans between 6m- 9m. Since we propose to build in-dune structures upto the depth of 12m, it is also important to bring in light inside the excavations in a controlled manner by making geometric variations in size and number of openings. The final aggregations are evaluated for reduced wind velocities on leeward side, ensuring sand accumulation inside sand channels.

Body Plan

9x9m : max roof span 6 x 6m : min roof span

10

0m

san

dc

140 I Emergent technologies and design

ha

nn

el

Gene pool

Fitness objectives

FC 1- Maximize wind directed towards the sand channel

N

Movement in -Z direcetion 0 to 6m

FC 2- Maximize shadow on open spaces

No. of opeings in the roof

N

Analysed for summer solstice , 6:00 am to 6:00 pm

Inclination of the roof 20 to 30 degrees

Scaling in along the grid axis 0.75 to 1.5 times

α

FC 3- Maximize indirect light on all open spaces

FC 4- Maximize morning sunlight on nurseries on courtyards Analysed for the entire year 6:00 am to 6:00 pm

Selection of grid cells of aggregation of roof

FC 5- Minimize intersection of roof geometries

In-dune I 141

Pareto front solutions Gen 49 Ind 06 FC1 FC5 FC2 FC4 FC3

Reduced velocity zone 50m

Gen 49 Ind 011 FC1 FC5 FC2 FC4 FC3

Reduced velocity zone 60m

Gen 49 Ind 05 FC1 FC5 FC2 FC4 FC3

Reduced velocity zone 70m

Wind velocity

12m/s

0m/s

142 I Emergent technologies and design

No. of Generation: 50 No. of Individuals : 2500

Gen 49 Ind 46 FC1 FC5 FC2 FC4 FC3

Reduced velocity zone 75-80m

Selected phenotype

Maximum reduced wind velocity zone in lee

Best of FC 1 + FC 2 : Max deflection and max shading

Pareto front soultions

Conclusions While all the aggregations deflect the wind towards the sand channels, the speed and spread of deflected wind vectors determine accumulation of deflected sand either on peripheral access routes or into the sand channels.

The selected solution having maximum span or range of deflected vectors ensure unhindered circulation for pedestrians and sand accumulation directly into ditches.

In reality, the actual results of reduced speeds and deflection are dependent on roof material and texture.

Since deflection could not be tested with material, there will be a discrepancy in the computational results and actual deflection.

The arrangement of multiple roofs demand for a supporting structural system that can transfer the exerted loads on the roof surfaces directly into the ground.

Wind velocity

12m/s

0m/s

In-dune I 143

5.2.5 Typical roof detail The roof sits on a wooden frame work which directly transfers the load to the ground bio-cemented by multiple injections , avoiding any of it getting transferred to the walls injected by single point injection. The stone seat and concrete pedestal help in reducing the point loads. The shearing force of the wind is combated by wooden rafters by joining them to pin joints and customised metal joints. This allows for some degree of movement at critical junctions.

Hardened sand Stone seat (450 X 200mm) Wooden beam ( 300 x 450mm)

Detail A

Detail B

Detail C

Metal base plate ( 8mm thk) Rcc pedestal (600mm thk) Wooden post ( 300 x 300mm )

144 I Emergent technologies and design

Wooden batten ( 35x 35 mm) Primary truss rafter ( 250 x 200 mm) Ridge tile ( Sand+biopolymer+fibers) Base plate bolted to wooden beam

Detail A

Tile ( 200 x 300 mm , 40mm thk) Wide head screw Wooden batten ( 35x 35 mm) Secondary truss rafter ( 100 x 75mm)

Secondary truss rafters ( 100 x 75mm) Custom Ms connectors with pin joint Ms brackets welded to base plate

Detail B

Base plate bolted to wooden beam Wooden beam ( 450 x 300mm ) Bolt ( 15mm dia) MS plate and bracket ( 6mm thk) Wooden post ( 300 x 300mm)

Wooden post ( 300 x 300mm) MS insert welded to base plate MS bolts

Detail C

Base plate ( 8mm thk) Anchor bars welded to plate and rebars Rcc pedestal Tor 16 rebar Hardened sand

In-dune I 145

5.3 Resources and infrastructure Heavy influx of sand and extreme climatic conditions of the site subject the land and vegetation to a state of redundancy. The proposed design targets sustenance of a growing population of 2250 people.

Survival of the target population is directly dependent on production of high agricultural yield and development of a hydrological system.

Adoption of traditional and proposed interventions of sandstabilisation techniques can help formulate a scheme for transforming the expendable landforms into productive landscape.

Geotextile + Dune grass and shrubs Shelter belt : Large trees Agriculture terraces Irrigation canal Habitable spaces

m

250 0m

150

0m

250 m

250

146 I Emergent technologies and design

Population : 2250 Habitable space area Area per person [ 50 sqm + 35% Ciculation space ] : -----------------------------------------------------------67 sqm Area for 2250 people :-------------------------------------------------------------------------------------------150,750 sqm

Agriculture yield and area Average human energy requirement (2700 Cal/day) :-------------------------------------------1,000,000 Cal/year Average calories (Sorghum, Castor seeds, Peanuts) :----------------------------------------------------5200 Cal/kg Average yield in Rajasthan(Sorghum, Castor seeds, Peanuts) :----------0.14 kg / sqm/year or 806 Cal/ sqm Area of crop land required per person :----------------------------------------------1,000,000/806 m2 = 1240 sqm Total Area of cropland for 2250 people :----------------------------------------------------------------- 2,790,000 sqm Assuming that with the help of strategic agricultural practices the yield can be increased by 300%

Total Area of cropland with improved yield for 2250 people :-----------------------------------------929,250 m2

Habitable space

4%

Biomineralization Area: 1.13 sqm

24.1 % 10.6 %

Plantation Area: 2.62 sqm

Agriculture terraces

59.3 %

Shelter belt: trees Geotextile : shrubs and dune grass

Total area: 3.75 sqm Right : Stabilizated area proportions Left : Intervention region

In-dune I 147

5.3.1 Phasing The phased development of the site to accommodate the target population and the supporting agricultural yield is dependent on the pre-availability of water and establishment of temporary, non-mechanical sand stabilisation system. Once the connection to Indira Gandhi Canal is established and the terrain is temporarily retained over a period of 7 years bio-mineralisation of the windward and leeward sides begin. The sectional development of the terrain is carried out such that each phased development is holistic in supporting the water and agricultural requirement of the population it is inhabiting. The number of families being supported in a phase is correlative to the agricultural yield of that phase.

The extent of each phase is marked by the completion of at least one habitable cluster on each step. Since the size of sub-plots vary from 200m-75m on windward side, one phase is marked as a 200m long section. Based on the correlative calculations on terraced area, improved agricultural yield and area requirements per person, each phase is subjected to build habitable spaces on 5 steps, accommodating 50-70 families collectively. The steps chosen to accommodate the habitable spaces are closer to the crest of the dune as they are subjected to less radiation values and are also above flood level.

148 I Emergent technologies and design

Stage 1

Year 5 Irrigation canal and Bioremediation system

Stage 2

Year 5 - 7 Simultaneous plantation of shelter belt and dune grass with geotextiles

Stage 3

Year7- 27 Biomineralization of terraces for agriculture and habitable spaces

0m

150

300

Stage 3 -phasing Year7- 27 Biomineralization of terraces for agriculture and habitable spaces

200

m

200

m

200

m

200

m

200

m

200

m

m

Area requirement for each phase Population : ---------------------------------------------------------------------------------------------------------------------300 Total habitable space area : ---------------------------------------------------------------------------------------10,050 sqm Total number of cluster : ---------------------------------------------------------------------------------------------------------5 Total number of families :------------------------ ----------------------------------------------------------------------50 to 70 Total Area of cropland :------------------------------------------------------------------------------------------ 124,000 sqm

In-dune I 149

5.3.2 Hydrological system The three possible sources of water for the site have the potential to collectively cater to the annual water requirement. The availability is however also dependent on the current water consumption percentage in the neighbourhood, ground fabric and supporting infrastructure required to procure water from these sources.

The current data of availability and consumption of water from aquifer show over exploitation of the resource and hence limits the scope of its use. This source can however be tapped into if there is surplus ground water after being recharged by monsoon showers. The water collected from surface runoff in the dunal valley during short monsoon season can only cater to <1% of the net annual requirement. The storage of surface run-off over the years can however create an increase in the net stored volume of water. Currently, the difference between annual requirement and harvested water is significant. This dearth of water availability can only be balanced by procuring it from another rich source. The tail of Indira Gandhi Canal ends approximately 300 km from the site. Establishment of a connection from the site to the canal can overcome the deficit of water requirements of the site.

Indira Gandhi canal project

Artificial irrigation canal ( 300km away)

Aquifer ( 60-80m below GL) Jan

Oct

Saline

Jan

April

July

150 I Emergent technologies and design

Oct

Heavymetal contamination

July

Catchment areas (adjacent dune valleys) Jan

April

Oct

Fresh with sediments

July

April

Total water annual water requirement ( all phases completed ) Tree belt : -------------------------------------------------------------------------------------------------------2460 l/m2/ year Annual requirement for tree belt [200,000 sqm ] :---------------------------------------------- 984,000,000 l/year Agricultural belt :----------------------------------------------------------------------------------------------4000 l/m2/ year Annual requirement for agriculture [ 929, 250 sqm] :--------------------------------------- 3,717,000,000 l/year Consumption per person : -----------------------------------------------------------------------49275 l/year (135 l/day) Annual water consumption by 2250 people :----------------------------------------------------- 98,550,000 l/year Total Annual water requirement fot the system :--------------------------------------------- 4,799,550,000 l/year

Water avalibility from various sources Ground water Annual availability in Rajasthan-----------------------------------------------------------------------------256,347 x 106 L Existing Annual consumption : ------------------------------------------------------------------------- ---321,271 x 106 L Total ground water availabe for use :---------------------------------------------------------------------- - 64,924 x 106L

Surface run-off Annual rainfall : :---------------------------------------------------------------------------------------100mm or 100 L / sqm Hardened sand surface ( coefficient = 0.98 , area = 1,125,00 sqm) :---------------------- 110, 250, 000 L / year Unvegetated terrain ( coefficient = 0.68, area =1,875,000 sqm ) : ------------------------127, 500, 000 L / year Vegetated terrain ( coefficient = 0.49 , area = 2,620,000 sqm) : -------------------------- 128, 380 , 000 L / year Total potential of runoff collection : --------------------------------------------------------------- 366,130,000 L/ year

Irrigation canal Discharge rate of canal : ------------------------------------------------------------------- 4843 ft3/sec or 137,988 L/sec Annual availability of water : ---------------------------------------------------------------- 4,350,000,000,000 L/ year

In-dune I 151

Agriculture terrace Water collection Reservoir Normal water level Water level 0.0 m

Bio-remediation ponds

Canal water shortage Water level - 3.5m

Reserved supply to bio-remedation ponds Agriculture terrace

Surface run-off

Elevated walkway Replenishment of water in reservoir

Flood condition Water level + 3.5m

Treated water Surface run-off

152 I Emergent technologies and design

Weir

Weir

+ 3 m ( flood condition) + 0 m ( normal condition) - 3.5 m ( scarce canal water supply) -7m

40 m wide

35m wide

55 m wide

Water channel

Public space

Bio-remediation pond

Treated water

Water management

Shade balls used over water bodies to reduce the loss of water due to evaporation Source: https://www.dailymail.co.uk/news/article-3204873/How-100-million-shade-balls-brought-protectLA-s-reservoir-evaporating-fact-bacterial-nightmare.html, accessed on 29/12/2019

Geo-membrane lining optimize the canal’s flow and prevent loss of water to seepage

As discussed earlier, water from Indira Gandhi Canal can rapidly increase the ground water levels and cause water logging and salination of the soil. This makes collection and building of surface run-off very critical. The water from surface run-off are collected in a reservoir. While this resource is building up, water from the canal can primarily be used by treating it with bio-remediation. Once there is sufficient collection of water in the reservoir, the dependence on canal water can be reduced by controlling the influx of water with the help of dams and weirs. In the years of drought when the water level in canal is reduced, the reserve from reservoir can be brought to use. In the rare case of flooding, the water in the reservoir is recharged by surface run-off and canal water.

Water treatment is not affected by overflow of the canal.

Post treatment, the water is supplied to the agricultural fields for micro-irrigation. Based on the canal’s water levels certain spaces are available which are transformed into public spaces. These are mostly located near canal and bioremediation fields.

High evaporative rates on the site and desalination of soil due to seepage from canal pose a serious threat to the whole hydrological mechanism of the site. While the continual flow of water inside the canal can help reduce its evaporation, water collected in the reservoir is subjected to evaporative loss. Deploying of shade balls or float balls floating on top of the reservoir can slow the evaporation and prevent sunlight from causing reactions among chemical compounds present in the water. Increased salinity in the soil and loss of water from the canal can be a result of its cracked concrete lining.

Spread of geo-membranes are an economical solution for being flexible and impervious to cover the porous biomineralised sand surface that can reduce loss of water over time and ensure streamlined flow.

Source: https://www.geosynthetica.com/headrace-canal-hdpe-geomembrane-project/, 29/12/2019

In-dune I 153

154 I Emergent technologies and design

Water tank sizes and quantities for each phase Domestic water tanks ( 10 days holding capacity) Daily water requirement for 300 peopl( 135 /d)-----------------------------------------------------------------40, 500L Water required for 10 days: -------------------------------------------------------------------------400, 500L or 400.5 m3 Asuming depth of tank =1.2m for saftey and Length x width= 3x3m based on injection grid size

Volume of one domestic tank :---------------------------------------------------------------------------------------10.8 m3 Total no of tanks required in one phase :----------------------------------------------------------------------------37 nos Total of no of tanks required in each cluster:------------------------------------------------------------------------7 nos

Micro-irrigation water tanks ( 10 days holding capacity) Daily water requirement for agriculture( 11L/m2)---------------------------------------------------.-------1,364,000L Daily water requirement for 10 days: -------------------------------------------------------13,640,000L or 13,640m3 Asuming depth of tank =15 m ( max injection depth to maximize area available for agriculture) Width = 3m (minmum injection width to maximize area available for agriculture) Length = 21m

Volume of one domestic tank :----------------------------------------------------------------------------------------945 m3 Total no of tanks required in one phase :----------------------------------------------------------------------------16 nos Total of no of tanks required on each step:---------------------------------------------------------------------------1 nos Total capacity of 16 tanks:--------------------------------------------------------------------------------------------15,120m3 Surplus capacity of 1480 m3 is sufficient to water the plant nursuries inside the cluster

The water from the three sources are distributed across the site with a network of collection and underground storage tanks. The water in these tanks are mechanically aerated to stabilise bacterial growth. Water post treatment are used for different purposes depending on the source of treatment. The extreme climatic conditions of the site cannot be changed and hence adaption of water conservation techniques is critical. While practise of irrigation techniques like microirrigation and water retaining pits can significantly reduce the water requirement for agriculture, recycling and reuse of grey water can reduce water requirement for habitable spaces.

In-dune I 155

5.3.3 Shelter belt When vegetative barriers like trees are placed in the path of wind, they reduce the velocity near ground by exerting a drag on wind and deflecting wind stream. The deflection of sand laden winds can shield the leeward area from sedimentation. The effectiveness of shelterbelt in reducing wind velocity depends on direction and velocity of wind, shape, height and density of trees and width of shelterbelts. 54 While direction and velocity of the wind cannot be controlled, the geometric variation in shelterbelts can be made to shelter the leeward area.

Height: Plantation at regular intervals of 8-10 times the height of the tree can shelter greater distance than 6-8 times the height .55 The shelter belts on the crests of dunal section are designed to be at least 5 trees thick.

Length: Turbulence or tunnelling effect is generated at the end of short belt lengths which can facilitate wind borne hazards. Belts with lengths 10-12 times the height of the tree do not show any signs of turbulence. The shelter belts are planted along the crests of dunal valley of length greater than the selected patch.

Density: Uninterrupted and uniform shelterbelt plantations are more effective than those with interruption or gaps. These gaps provide space for passage of wind with higher speed and turbulence causing more soil erosion. Dense alignment of trees creates opportunity to design shaded walkways.

Initial stage

2-3H

6H - 8H

Height : H

Upwind sedimentation

Sedimentation over time

Tree covered in sand overtime unless saltation occurs due to wind blowing from a different direction

156 I Emergent technologies and design

Downwind sedimentation

90 90

m

m

South-west wind (predominant) Deflected south-west wind Secondary wind

Shelter belts apart from deflecting the sand like porous barriers accumulate sand and get buried under it with time. The bimodal winds play a significant role in eroding the accumulated sand away from the sheltered area. Alignment of closely packed trees in the direction of subsidiary and deflected subsidiary winds funnels the sand laden wind and accelerates its speed to facilitate erosion of accumulated sand for windward and leeward sides. Laying of geo-textile mats, plantation of shelter belts and building of sand channels stabilise the terrain and work in synergy with wind speeds and directions to form sand deflection mechanism.

Sand accumulation downwind due to action of secondary wind Predominant wind errodes accumulated sand along the sand channel

Sand accumulation downwind due to action of predominant wind Funneled secondary wind errodes accumulated sand into adjacent valley

Increased sedimentation due to deflected sand accumulation

Sand accumulation downwind due to action of predominant wind

Saltation reduced due to plantation of dune grass.

Deflected predominant wind errodes accumulated sand into adjacent valley

Sand accumulation increases in adjacent valley

Sand accumulation downwind due to action of secondary wind Predominant wind errodes accumulated sand along the sand channel

In-dune I 157

Selected plants for erosion control and deflection

Trees

Uses Animal fence Diffused light Shade Food/Fodder

Jujube/chinese date (Ziziphus mauritiana)

Umbrella thorn (Acacia tortilis)

Chilean Mesquite (Prosopis chilensis)

Gum arabic tree (Acacia nilotica )

Khejri (Prosopis cineraria)

Wood Bird habitat

15-21m

12-15m

5 - 6m

3.5 - 4m

Time period of effectiveness

55 -60 years

70 years

Maturity period

30 years

40 years

Life span

50 -70 years

100 years

Water requirement Effectiveness on slopes <10*

3500 m3/ha

4015 m3/ha

Effectiveness on slopes >10*

Acacia nilotica grows quickly, coppices readily and is a source of fixing nitrogen, improving soil fertility and its leaves and pods are widely used as fodder.

158 I Emergent technologies and design

Dune grass

Succulents/shrubs

Phog (C. polygonoidess)

Leafless Milk Hedge (Euphorbia caducifolia)

Lana (H. salicornicum)

True aloe (Aloe vera)

Sewan grass (Lasiurus scindicus)

Pricky pear (Opuntia)

Caper/ karira (Capparis decidua)

Buari (A. pseudotomentosa)

2.5 - 3m

1.5 -2m

.6 - .9m

3-5M 1-2M .3-2m

20 years

15 years

20 years

4 months

12 months

5 years

18 years

20 - 25 years

20 - 25 years

700 m3/ha

1250 m3/ha

1500 m3/ha

In-dune I 159

5.3.4 Agronomics The injected steps shielded by shelter belts and supported by supply of water from the canal and surface-offs support the growth of crops for all the seasons. However, the distribution of the crops over these steps are largely governed by varying radiation values on each step and proximity to water resource. Availability of land to plant on the terraced steps depends on different water levels during flooding and drought. During the period of drought, crops are planted closer to the valley for low radiation value and higher proximity to the water.

On the contrary, flood conditions compel plantation above the flood level. The receding floods increase the deposition of fertile soil on each step, supporting the agronomic growth. Perennial fruit trees shade the ground and help in replenish more nutrients in the soil than crops.

Seasonal cropping gives the opportunity to the soil to regain its lost nutrients. Coupled with intercropping, agroforestry and crop rotation, these crops can also act as a barrier to the speedy winds.

Thus, ensuring retention of fertile soil and its moisture.

Selected plants Selection of the crops are mainly based on the resistance to drought, aridity and high temperature coupled with their potential to produce high yield. Sometimes there might be competition between tress and crops particularly closer to the shelter belt for nutrients and other resources. Proper selection of both the components are essential to take the benefits of sheltering from trees and high yield from crops.

Giving a protective environment in the plant nurseries during initial growth years can significantly improve the chances of plant survival post plantation on the steps. (Refer to Appendix Section 8.3 for details on crops cultivated in Rajasthan)

Spatial requirement for nurseries in each phase Number of sapling required per year : ---------------------------------------------------------------------------40,000 Total area requirement for plant nurseries (60,000 saplings per 1500 sqm) : -----------------------1000 sqm Area of plant nursery per cluster : -------------------------------------------------------------------------------200 sqm

160 I Emergent technologies and design

Perennial fruit trees

Dry season Jan

Feb

Mar

Apr

Wet season May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Sorghum Millets Pigeon Pea Moth bean Marama bean Pricky pear Date palm Gemsbok cucumber Aloe vera

In-dune I 161

Selected plants for food resources

Fruit trees Prickly pear (Opuntia)

Date palm (Phoenix dactylifera)

Gemsbok cucumber (Acanthosicyos naudinianus)

Aloe vera (Aloe barbadensis miller)

0.6 - 1 m

0.3 - 0.6 m

2.5 - 3 m

Nursery period

1 month

2 month

1 month

1 month

Harvesting period

8 months

6 months

2 months

2-3 years

Temp. resilience

45 -113 °F

2.5 - 3 m

2.5 - 3 m

0.2 - 0.6 m

0.3 - 0.9 m

0.3 - 0.9 m

2.5 - 3 m

0.6 - 1 m

3 -5 m

1 -1.5m

5 -132 °F

65 - 75 °F

55 - 80 °F

Water requirement

3432 m3/ha

3419 m3/ha

2559 m3/ha

1100 m3/ha

Height of Plant

2.1m

21- 23 m

1.1-1.3 m

1m

Yield (kg/hectare)

9071 kg/ha

7480 kg/ha

15000kg/ha

8271 kg/ha

Calories per kg

4100

3690

100

530

Date Palms can survive over 100 years and produce anything from food to bio-fuel.

162 I Emergent technologies and design

Cereal grains Sorghum (Sorghum bicolor)

Grain Legumes

Pearl millet (Pennisetum glaucum)

Piegon pea (Cajanus cajan)

Mat bean (Vigna aconitifolia)

Morama bean (Tylosema esculentum)

1 -2m

1 -2m

0.3 - 0.6 m

1.5 -3 m

1-2m

0.3 - 0.5 m

1 - 1.5 m

1 month

20 days

1 month

1 month

1 month

3 months

4 months

3 months

3 months

2 months

1-2m

2 - 3.5 m

1 -1.5 m

1 - 1.5 m

1-3m

1.5 - 2 m

0.3 - 0.5 m 0.3 - 0.6 m

75 -90 °F

75 - 90 °F

77 -113 °F

77 -95 °F

77 -113 °F

2321 m3/ha

1920 m3/ha

1830 m3/ha

1960 m3/ha

2060 m3/ha

1.5 - 2 m

1.5 - 2.4 m

5m

1.5m

3m

181 kg/ha

131 kg/ha

240 kg/ha

169 kg/ha

400 kg/ha

4700

3780

3430

3430

3650

Pearl millets are less susceptible to drought than legumes.

Amongst all the legumes, tolerance to drought is highest in varieties of moth bean

In-dune I 163

164 I Emergent technologies and design

6. Design Proposal The chapter is a synergic integration of all the three systemshabitable, agricultural and hydrological and their sub systems. It details time based application of techniques and its corresponding impact on environmental and system changes. The section documents architectural details of proposed interventions and visualisation of the design ambition in context to the site.

6.1 Program distribution The distribution of varied programs across the intervened dunal valley generates different spatial qualities, each supporting unique activities that contribute in building improved lifestyle of the locals. Virtually marking the boundaries of the section, the shelter belts along with stepped terraces near the water canal form public spaces. Shade from the shelter belt trees and lowered micro-climate due to water in the canal make these public spaces active even during the hottest months of the year. A strategic selection of tree species is made such that the variation in height, canopy spread and density of foliage create differing qualities of filtered light in these spaces. Qualities such as shade and diffused light from these trees help to transform the area into ecological park and demarcate public, semi-public and private zones.

While distribution of habitable spaces remain the same, agricultural terraces are active based on the season and water level in the canal.

Flood condition in the region make the public spaces and agricultural plots closer to canal unusable. To avoid this condition, habitable spaces are zoned closer to the crest, along with elevated corridors and pathways.

166 I Emergent technologies and design

In-dune I 167

6.1.1 Site section

168 I Emergent technologies and design

Stablilization system scales Biomineralization

Wind deflection

+ 75 m + 45 m + 15 m - 15 m

Programs Habitable Public spaces Water harvesting Agriculture Tree belt In-dune I 169

6.1.4 Public spaces and shelter belt Windward flank

Key section

Elevated walkway Alternate material

Donum palm (Hyphaene thebaica) Shading Low wind resistance

Agriculture terraces

Flood water level Normal water level Drought

40m Irrigation canal

170 I Emergent technologies and design

Bioremediation pond Agriculture terraces Elevated walkway Vehicular access

sacrificial public space

Normal canal water level + 4.5m

Flood condition + 10m

Vehicular roadway (Opuntia)

Rushes (Juncus spp.)

Rhizofiltration

Original dune profile + 20m

+ 10m

+ 1.4m 0m

- 15 m

Zone protected from flooding

150m

75m

15m

Bioremediation ponds

Remediated & terrace run-off collection tank

Public space In-dune I 171

6.1.2 Site section

Leeward flank

Key section

Date palm (Phoenix dactylifera)

Gemsbok cucumber (Acanthosicyos naudinianus)

Piegon pea (Cajanus cajan)

Shading

Nitogen fixation

6m (8% slope) Terrace for perennial fruit trees

172 I Emergent technologies and design

Ramp

9m Sand channel

2m

Bioemediated water

surface run-off to sedimentation tank and bioremediation ponds

Pearl millet (Pennisetum glaucum)

20m

3m

9m

Terrace for Winter crops

Water tank

Sand chan

Morama bean (Tylosema esculentum)

Umbrella thorn (Acacia tortilis) Shading

Umbrella thorn (Acacia tortilis)

Pearl millet (Pennisetum glaucum)

Shading

Sorghum (Sorghum bicolor)

00 m

- 10 m

- 20 m

Micro-irrigation

- 30 m

4m (fertile soil)

- 38 m

Original dune profile

9m Sand channel

25m Terrace for Winter crops

6m (8% slope)

9m

Ramp

Sand channel

Terrace for Summer crops

In-dune I 173

6.1.3 Shelter belt

Windward

Key section

Phog (C. polygonoidess)

Caper/ karira (Capparis decidua)

10m (3% slope)

10m (3% slope)

10m (3% slo

Reverse graded terrace

Reverse graded terrace

Reverse graded

100m Dune flank stabilized with dunes and shrubs along with geotextiles

174 I Emergent technologies and design

Tree shelter belt on du

Pricky pear (Opuntia) Khejri (Prosopis cineraria)

0m

Original dune profile - 10 m

- 15 m

0m (3% slope)

erse graded terrace

10m (3% slope)

10m (3% slope)

3m

15m

Reverse graded terrace

Reverse graded terrace

Water tank

Sand channel

100m belt on dune crest

In-dune I 175

6.1.4 Habitable terraces

Windward flank

Key section

Shading

Bioemediated water

Micro-irrigation

24m

Terrace for summer crops

176 I Emergent technologies and design

Sand channel

Water tank for irrigation

Small and medium sized family cluster

Domestic use

Shading

Collected rain water to sedimentation tank and bioremediation ponds

Donum palm (Hyphaene thebaica)

Bioemediated water

Umbrella thorn (Acacia tortilis)

6m

9m

Access to cluster

Sand channel

Pri int circ

m hebaica)

nel

Plant nursery

Khejri (Prosopis cineraria)

00 m

Diffused light Original dune profile

- 11.5 m

- 15 m

Domestic use

Bioemediated water

- 34.5 m

- 30 m

- 50 m

6m

30m

6m

13m

Primary inter-step circulation

Medium and large sized family cluster

Access to cluster

Sand channel

In-dune I 177

6.2 Cluster time-scales The fabrication of the cluster commences with the ground preparation for injection. Deployment of heavy machinery, material procurement, injecting and hardening of the composite suggest a time bound development of each structural component. Based on that foundations are injected first followed by the walls. After curing, larger pits are excavated sequentially to minimize the lateral loads of the loose sand on the walls. New roofs are fabricated and installed over these spaces and plants and trees are planted in the defined areas.

The whole process for a cluster of 6 families to become suitable for occupancy takes about three years. As the family size increases with time, the reserved spaces (Expansion Units) are brought to use.

Key plan : one cluster

178 I Emergent technologies and design

In-dune I 179

6.1.2 Cluster section 0-3 years

Key section

0 year Area

2400 m2

Sheet piling to retain the sand

2 days ( 4m per/hr)

180 I Emergent technologies and design

Ground leveling + Deployment of sand mats

3 days ( 4m per/hr)

Multi-level 3 x 3m injections for foun

45 day

100 m ( cluster length )

+ 15 m

00 m

- 04 m

- 08 m

- 12 m

vel 3 x 3m matrix ns for foundation

Multiple single point injections for walls

45 days ( 162 sqm/day + 15 days curing)

Excavation of larger pit first to reduce lateral load on hardened walls

45 days ( 1000 m3/day)

Addition of floors slabs , roof , cutting openings, soil filling

24-26 months

In-dune I 181

6.1.3 Cluster section 3-20years

Key section

Cluster becomes habitable

3 years Population Family sizes

34 pax 5,5,8,8 & 8

9m

3m

Primary access corridor

Small family unit

Umbrella thorn (Acacia tortilis) Shading

Excavation of reserved spaces and addition of new roof structures

10 - 20 years Population Family sizes

55 pax 8,8,13,13 & 13

182 I Emergent technologies and design

9m

15m

Primary access corridor

Nursuries and courtyards

00 m

- 04 m

- 08 m

- 12 m

30m

3m

9m

Large family unit

Small family unit

Medium sized family unit

Donum palm (Hyphaene thebaica)

00 m

- 04 m

- 08 m

- 12 m

6m

9m

New excavated spaces

Animal pen

3m New excavatedSand channel spaces

In-dune I 183

186 I Emergent technologies and design

In-dune I 187

188 I Emergent technologies and design

In-dune I 189

6.3 Global time-scales Synthesising the habitable and productive system, the site is planned in a series of spatial and programmatic interventions. The execution of these interventions are based on priority and interdependence.

Post selection of dunal valley for transformation, the most critical entity- water is brought to site by constructing a connecting channel to Indira Gandhi canal. To avoid the hinderance of sand influx in the initial construction process of the canal, temporary porous barriers are deployed simultaneously to deflect the sand away from it and form check posts to plant trees. Estimating the completion of fully functional canal in 5 years, initiation of all other schemes are scheduled post this time frame.

Construction of supporting infrastructure- ramps and maintenance centre are planned such that their completion is complimented with that of the canal to facilitate the next step of stepped transformation of dunal slopes. Both windward and leeward sides are retained by temporary surface treatment techniques like geo-mats, dunal shrubs and grasses and plantation of shelter belts. The short life spans of mats and shrubs suggest their constant replacement throughout the developmental phase. As shelter belt trees last over 100 years and act as wind breaks, their plantation is carried all throughout the selected patch and beyond. To channelise the incoming and deflected sand into ditches, machine cutting of injected sand channels are carried simultaneously with the development of each agricultural and habitable step.

Before the habitable spaces are available for occupation, shelter belts and dunal shrubs and grasses grow to their full potential. It is only after the habitable pits are excavated that in-situ fabricated roofing system is established over them. Corresponding to the number of occupants and seasons, suitable number of saplings are grown in the plant nurseries. However, for the first yield, external inputs of saplings are needed. Injection of underground tanks and distribution network for agricultural and domestic uses happens simultaneously with development of terraces on both the flanks. Water tanks are centrally injected to all the room, as it brings down the room temperature further. The water for these tanks is purified and stored prior to the plantation and habitation of the excavated pits. Once both these systems are ready to be used, water is circulated around the valley.

Over the years the terrain can see the growth of vegetation covers and reduction of dependence on artificially procured water from the canal.

Building up of its own reservoir of water from rainfall and conservation techniques, the site is aimed to achieve a state of self-sufficiency with time. Phasing activates different parts of the site differently. Minor variations in the spatial application of techniques could occur due to bio-grouting at different levels and excavation of unhardened sand

190 I Emergent technologies and design

Year 50

Simultaneous development across multile dune valleys

Phases Completed Families Population

Multiple across alternate dune valleys 450 x no. of settelments 3150 x no. of settelments

Injected Area Planted Area

930,000 m2 x no of settelments 215,000 m2 x no of settelments

Canal Water Available Surface runoff available Agricultural Yield

4.35 x 1012 litres 130,200 kg x no of settelments

Year 0

5

10

15

20

25

30

35

40

45

50

Deflection system: Porous barriers Water Canal Geo-mats Shelter belt :grasses and shrubs Shelter belt: trees Infrastructure for machines Agricultural terraces Underground water storage Injection and excavation of spaces Installation of roof and floor slabs Micro-Irrigation Crop Plantation Plant nurseries

In-dune I 191

192 I Emergent technologies and design

Year 0-2 Phases Completed Families Population

0 0 0

Injected Area Planted Area

0 m2 0 m2

Canal Water Available Surface runoff available Agricultural Yield Year 0

0 litres 0 litres 0 kg 5

10

15

20

25

30

35

40

45

50

Deflection system: Porous barriers Water Canal Geo-mats Shelter belt :grasses and shrubs Shelter belt: trees Infrastructure for machines Agricultural terraces Underground water storage Injection and excavation of spaces Installation of roof and floor slabs Micro-Irrigation Crop Plantation Plant nurseries

In-dune I 193

194 I Emergent technologies and design

Year 5 Phases Completed Families Population

0 0 0

Injected Area Planted Area

0 m2 0 m2

Canal Water Available Surface runoff available Agricultural Yield Year 0

4.35 x 1012 litres not collected 0 kg 5

10

15

20

25

30

35

40

45

50

Deflection system: Porous barriers Water Canal Geo-mats Shelter belt :grasses and shrubs Shelter belt: trees Infrastructure for machines Agricultural terraces Underground water storage Injection and excavation of spaces Installation of roof and floor slabs Micro-Irrigation Crop Plantation Plant nurseries

In-dune I 195

196 I Emergent technologies and design

Year 10 Phases Completed Families Population

2 135 750

Injected Area Planted Area

65,000 m2 31,000 m2

Canal Water Available Surface runoff available Agricultural Yield Year 0

4.35 x 1012 litres 1.70 x 105 litres 4340 kg 5

10

15

20

25

30

35

40

45

50

Deflection system: Porous barriers Water Canal Geo-mats Shelter belt :grasses and shrubs Shelter belt: trees Infrastructure for machines Agricultural terraces Underground water storage Injection and excavation of spaces Installation of roof and floor slabs Micro-Irrigation Crop Plantation Plant nurseries

In-dune I 197

198 I Emergent technologies and design

Year 37 Phases Completed Families Population

7 450 2250

Injected Area Planted Area

930,000 m2 195,000 m2

Canal Water Available Surface runoff available Agricultural Yield Year 0

4.35 x 1012 litres 1.85 x 105 litres 130,200 kg 5

10

15

20

25

30

35

40

45

50

Deflection system: Porous barriers Water Canal Geo-mats Shelter belt :grasses and shrubs Shelter belt: trees Infrastructure for machines Agricultural terraces Underground water storage Injection and excavation of spaces Installation of roof and floor slabs Micro-Irrigation Crop Plantation Plant nurseries

In-dune I 199

200 I Emergent technologies and design

Year 50 Phases Completed Families Population

7 450 3150

Injected Area Planted Area

930,000 m2 215,000 m2

Canal Water Available Surface runoff available Agricultural Yield Year 0

4.35 x 1012 litres 1.85 x 105 litres 130,200 kg 5

10

15

20

25

30

35

40

45

50

Deflection system: Porous barriers Water Canal Geo-mats Shelter belt :grasses and shrubs Shelter belt: trees Infrastructure for machines Agricultural terraces Underground water storage Injection and excavation of spaces Installation of roof and floor slabs Micro-Irrigation Crop Plantation Plant nurseries

In-dune I 201

202 I Emergent technologies and design

Year 50

Simultaneous development across multile dune valleys

Phases Completed Families Population

Multiple across alternate dune valleys 450 x no. of settelments 3150 x no. of settelments

Injected Area Planted Area

930,000 m2 x no of settelments 215,000 m2 x no of settelments

Canal Water Available Surface runoff available Agricultural Yield

4.35 x 1012 litres 130,200 kg x no of settelments

Year 0

5

10

15

20

25

30

35

40

45

50

Deflection system: Porous barriers Water Canal Geo-mats Shelter belt :grasses and shrubs Shelter belt: trees Infrastructure for machines Agricultural terraces Underground water storage Injection and excavation of spaces Installation of roof and floor slabs Micro-Irrigation Crop Plantation Plant nurseries

In-dune I 203

204 I Emergent technologies and design

7. Analysis and Critical reflection Global time scales in the previous chapter assimilate the development of the entire terrain. Even though each of the adopted methods and techniques individually create an impact on sand mitigation at a local scale, these local changes can collectively bring significant difference in sand accumulation and deflection at a regional level.

The exchange of energy and material between the evolved systems have the potential to alter the climatic system at micro or macro level for the region, depending on the scale of application of each of these systems.

In-dune I 205

Deflected sand to neighbouring valley Single settlement

Heavy sand deposition in intermediate valleys Multiple settlements | Parallel arrangement

Distributed sand deposition in intermediate valleys Multiple settlements | Staggered arrangement

206 I Emergent technologies and design

7.1 Emergence of new landforms Amongst the array of crests and valleys in the linear dune fields, while the incoming sand is deflected to shield the intervention area, it is accumulated in the neighbouring valley regions. As the influx of sand cannot be stopped, the deflected sand exists within the ecosystem of the region. The interplay of accumulation and deflection starts defining the land-use pattern for other regional functions and settlements to co-exist. Multiple settlements can grow in alternate parallel dunal valleys to deflect the sand towards the intermediate valleys. These regions have a greater influx of sand than natural and become unfit for any productive system to flourish. To distribute the influx from the two neighbouring deflection systems into these valleys, the settlements can be staggered. Staggering also generates differential sand accumulation zones within these regions. These inter-dunal valley regions with lesser sand deposit can be developed as catchment areas for rain water harvesting and be used for other purposes.

It is hypothesised that with time as the multiple settlements grow, collection of sand builds up due to accelerated deflection mechanism and unhardened dunes shift, a new landform of dunes and valleys would emerge. The emergent landform would define a new urban edge for neighbouring regions and cities. It might pose a threat of dunal encroachment in these areas similar to cities like Cairo and Mauritania or form an opportunity to be developed as green corridors with strategic plantation and other soil retention measures.

7.2 Sand deflection and sedimentation Sand deflection and sedimentation works at a regional level once all the techniques are established and are working to their full potential.

While the proposed techniques are still in the phase of development, the continuous influx of sand needs to be temporarily restrained by on-site measures such as fences and other membranes. The excavation of habitable spaces without roof installation makes them highly vulnerable to sand accumulation. In such scenario, the excavation of the pits should be planned for months (September-March) when the wind velocities from both the directions are least and its sand carrying capacity is the least.

Once the entire system of habitable spaces with corresponding roofs and sand channels is established for a phase, the sand deposition and simultaneous erosion starts effectively. The eroded sand as it builds up increases the volume for excavation for the succeeding phase.

Increased excavation amount might subject completion of the next phase to some delay.

So far all the proposed sand mitigation interventions are investigated and designed based on pre-dominant wind directions and their flow pattern for most of the year. The proposed techniques would become redundant when the direction of the wind changes. The sedimentation due to the other wind direction would needed to be removed manually or deflected using temporary measures.

In-dune I 207

7.3 Bio-mineralised sand Microbial injecting into sand to develop habitable spaces and other components in different profiles has been proposed based on the compressive strength that homogeneously cast composite brick attains. While it is assumed that the grout spread is uniform inside the sand, the actual spread should be tested physically. The results from the tests would start defining the attainable surface textures, wall thicknesses, undulations, permeability and load bearing capacity. The arrangement of spaces has been directed by micro-climate analysis only, the strategy should be coupled with structural tests. For the difference in hardening time of different components for varying injection depths, profiles and volume of required grout, the fabrication strategy and time estimations for development of each phase should be revisited.

Monolithically casted each wall would behave like a load bearing structure. While core-cutting is proficient to make small openings in such structures, its ability to make bigger openings for doors and windows need to be practically tested.

Sodium Chloride being the by-product of cross-linking technique would make the hardened agricultural terraces unfit for direct plantation. The terraces should to be lined with clay so that the salt does not percolate through the roots of the plants.

7.4 Occupancy, Social Fabric and Infrastructure The proposed occupation strategy might be revisited for a new method where instead of injecting habitable spaces for each function, a matrix of walls are injected over the foundation and the occupants are given a choice to merge spaces as per their growing family sizes and requirements.

The proposed system of habitable spaces only account habitation as prime function. It lacks aggregation of functions like barns, market spaces, places of worship, shed for livestock, etc. These functions along with schemes related to infrastructure development like road networks, sewage disposal and treatment plants and institutional spaces should be a part of the aggregation algorithm and developmental scheme. At present the system lacks a social fabric.

The abundance of high solar and wind energy could be harnessed and brought to use to produce alternate source of energy. Schematic planning of solar and wind turbine farms could be done at a regional scale. A local level, the roof design should be improved to collect rain water and build water resource for the site

208 I Emergent technologies and design

7.5 Scope of application Heavy ground manipulation needs a radical shift in adapting to fabrication mechanism and habitation of in-dune spaces. Every subsystem has its own limitation in the scope of application and some deprecated impact on the neighbouring terrain. Scaling up their applicability across the dunal field would also mean scaling up the limitations. Some of these critical observations form the next steps for future research and investigation. Inclusive of all the advantages and disadvantages, these systems can build an ecosystem which has the potential to be resilient to desertification in western Thar.

The developed climate conscious architecture finds its applicability in dunal regions which are severely affected by desertification and shifting sands. The schemes can be adopted and adapted based on the effected regions’ dune morphology, wind pattern, demographics, ground fabric, availability of resources like water and other infrastructural support.

The sustenance of the system in any context would also be largely dependent on the availability of labours and participation of the locals who are willing to be a part of the developmental scheme. Since the system is mostly self-sufficient for it requires least material input, it might need major support from the local government to provide initial inputs of plantation, surface treatment measures and bearing the cost of running the machines, its fuel requirements and their maintenance.

Involvement of several stakeholders becomes critical for the success of the scheme.

In-dune I 209

210 I Emergent technologies and design

8. Appendix

In-dune I 211

8.1 Thar desert, dune morphologies Source :Amal Kar,Morphology and evolution of sand dunes in the Thar Desert as key to sand control measures,Research-gate,1996

BIKANER

POKARAN JAISALMER

JODHPUR

BARMER

LEGEND DOMINANTLY OLD DUNES

NEW DUNES

LINEAR DUNES

STAR DUNES

BARCHANS & BARCHANOIDS

TRANSVERSE

NETWORK: LINEAR DUNES WITH TRANSVERSALS

MEGABARCHANOIDS

PARABOLIC

NETWORK: TRANSITIONAL PARABOLIC DUNES

SAND STREAKS AND ZIBARS

NETWORK: SINUOUS DUNES

212 I Emergent technologies and design

8.2 Rajasthan livestock population trend Source : Ahmedabad, Rajasthan Agriculture,2012

Poultry

Cattle

Buffalo

Dog +9.4%

+60.69%

13324462

8024424

-52.29%

+16.99% 12119512 12976095

Rabbit

499362

569575

Sheep

11091974

1246036 9079702

13542 9301

+45.6%

-18.86%

11189855

208556 237674

21502996

421836

21665939

102130 886

325713

Pigs

81468

+13.96%

25438

Goat

37776

3375

+0.76%

+48.5%

-22.79%

Camel

Horse

-20.23% +280.93

2007

Donkey

2012

Mule

Cattle

Buffalo

Sheep

Goat

Horse

Mules

Donkeys

Camel

Pigs

Rabbits

Dogs

Poultry

2007

12119512

11091974

11189855

21502996

25438

886

102130

421836

208556

9301

1246036

499362

2012

13324462

12976095

9079702

21665939

37776

3375

81468

325713

237674

13542

569575

8024424

Change

1204950

11884121

-2110153

162943

12338

2489

-20662

-96123

29118

4241

-676461

3030804

+16.99%

-18.86%

+0.76%

+48.5%

+280.93%

-20.23%

-22.79%

+13.96%

+45.6%

-52.29%

+60.69%

% of Change +9.4%

In-dune I 213

8.3 Major crops cultivated in Rajasthan Source : Mrutyunjay Swain, S. S. Kalamkar,Manishkant OjhaState of Rajasthan Agriculture, Economic Research Centre,2012 Mrutyunjay Swain,S. S. Kalamkar ,Manishkant Ojha, Rajasthan Agriculture Prosperity and Opportunity, Agro-Economic Research Centre, 2012

Year 2021

2.67Mt

2011

1961 1971

2001

1981 2.41Mt 0.53 Mt

2.16Mt

0.62Mt 0.71Mt

1991

1991 0.79Mt

1.91Mt

2001

1981

1.65Mt

0.89Mt

1.40Mt

1971

0.98Mt

1.18Mt

1.07Mt 0.02Mt

1961 0.15Mt

2021

0.04Mt 0.13Mt

0.06Mt 0.11Mt

Year

2011

0.09Mt 1961

2021

Year

Crops Type Pulses

2011

1971 2001

Edible Oil

1981

Cereal

1991

Main Local Agriculture Prod-

Groundnut soyabean

Horticulture Crops

Cyamopsis (Cluster Beans)

Zea mays ( Maize )

Pennisetum glaucum

Psyllium ( Plantago )

Coriandrum sativum ( parsley )

( Oilseed )

kidney bean, pinto bean, navy bean

214 I Emergent technologies and design

( Pearl millets )

Primary crop Wheat Sugarcane Other Crops

Time to grow

Barley

Production(Mt )

38.39 40 - 55 Days

65 -75 Days

4.20

Soil

Time to grow

Sandy (Best) Black soil Alkali Saline

90 - 110 Days

Sandy Loam

Jowar

Groundnuts

40 - 45 Days

18.74

Clay Loam Sandy Loam

40 - 55 Days

60 Days

44.23

Soil

Clay Loam (Best) Silts Loams Gravels Alkaline

6.16

Clay Loam (Best) Loamy Texture

62.92

Clay Loam

19.38

Clay Loam

Oil Seeds

Maize

120 Days

Wheat

Rice

Production(Mt )

100.72

Clay Loam Loamy Texture

60 Days

Pulses

In-dune I 215

8.4 Micro-climate analysis Summers Thickness 0.3 m

0.6 m

0.9 m

1.2 m

1.5 m

1m

Microclimate Tem ( °C) : 38.61 - 50.68

Microclimate Tem ( °C) : 38.61 - 50.68

Microclimate Tem ( °C) : 39.74 - 51.59

Microclimate Tem ( °C) : 40.08- 49.93

Microclimate Tem ( °C) : 39.90 - 51.71

Microclimate Tem ( °C) : 36.20 - 49.88

Microclimate Tem ( °C) : 36.20 - 49.88

Microclimate Tem ( °C) : 37.39 - 50.75

Microclimate Tem ( °C) : 37.99 - 48.91

Microclimate Tem ( °C) : 37.54 - 50.84

Microclimate Tem ( °C) : 34.87 - 49.34

Microclimate Tem ( °C) : 34.87 - 49.34

Microclimate Tem ( °C) : 36.08 - 50.19

Microclimate Tem ( °C) : 36.82- 48.2

Microclimate Tem ( °C) : 36.22- 50.26

Microclimate Tem ( °C) : 34.87 - 49.34

Microclimate Tem ( °C) : 33.93 - 48.15

Microclimate Tem ( °C) : 35.89 - 47.01

Microclimate Tem ( °C) : 35.89 - 47.01

Microclimate Tem ( °C) : 35.26 - 49.06

Microclimate Tem ( °C) : 33.93 - 48.15

Microclimate Tem ( °C) : 32.89 - 48.70

Microclimate Tem ( °C) : 34.13- 49.50

Microclimate Tem ( °C) : 34.94 - 47.26

Microclimate Tem ( °C) : 34.25 - 49.56

Microclimate Tem ( °C) : 32.24 - 49.56

Microclimate Tem ( °C) : 33.31 - 50.34

Microclimate Tem ( °C) : 34.44 - 48.16

Microclimate Tem ( °C) : 34.44 - 48.16

Microclimate Tem ( °C) : 34.44 - 48.16

Microclimate Tem ( °C) : 14.99 - 15.68

Microclimate Tem ( °C) : 14.99 - 15.68

Microclimate Tem ( °C) : 15.11 - 15.83

Microclimate Tem ( °C) : 15.33- 16.15

Microclimate Tem ( °C) : 15.33- 16.15

2m

Depth

3m

4m

5m

6m

7m

216 I Emergent technologies and design

Thickness 0.3 m

0.6 m

0.9 m

1.2 m

1.5 m

8m Microclimate Tem ( °C) : 31.14- 49.14

Microclimate Tem ( °C) : 32.14 - 49.84

Microclimate Tem ( °C) : 33.28- 47.52

Microclimate Tem ( °C) : 33.28- 47.52

Microclimate Tem ( °C) : 33.28- 47.52

Microclimate Tem ( °C) : 30.87- 49.01

Microclimate Tem ( °C) : 31.80 - 49.68

Microclimate Tem ( °C) : 3298- 47.32

Microclimate Tem ( °C) : 33.98- 47.32

Microclimate Tem ( °C) : 32.98- 47.32

Microclimate Tem ( °C) : 30.67- 48.92

Microclimate Tem ( °C) : 31.58 - 49.56

Microclimate Tem ( °C) : 32.82- 47.17

Microclimate Tem ( °C) : 32.82- 47.17

Microclimate Tem ( °C) : 32.82- 47.17

Microclimate Tem ( °C) : 30.46- 48.84

Microclimate Tem ( °C) : 31.36 - 49.46

Microclimate Tem ( °C) : 32.53- 47.04

Microclimate Tem ( °C) : 32.53- 47.04

Microclimate Tem ( °C) : 33.53- 47.04

Microclimate Tem ( °C) : 30.29- 48.77

Microclimate Tem ( °C) : 31.14 - 49.37

Microclimate Tem ( °C) : 32.39- 46.93

Microclimate Tem ( °C) : 32.39- 46.93

Microclimate Tem ( °C) : 32.39- 46.93

Microclimate Tem ( °C) : 30.17- 48.71

Microclimate Tem ( °C) : 30.98 - 49.29

Microclimate Tem ( °C) : 32.28- 46.82

Microclimate Tem ( °C) : 32.28- 47.82

Microclimate Tem ( °C) : 32.28- 46.82

9m

Depth

10m

11 m

12 m

13 m

°C

14 m

50 48 46 44

Microclimate Tem ( °C) : 29.94- 48.64

Microclimate Tem ( °C) : 30.74 - 49.20

Microclimate Tem ( °C) : 32.01- 46.68

Microclimate Tem ( °C) : 32.01- 46.68

Microclimate Tem ( °C) : 32.01- 46.68

40 38 36 34 32

15 m

30 26 Microclimate Tem ( °C) : 29.82- 48.56

Microclimate Tem ( °C) : 30.58- 49.11

Microclimate Tem ( °C) : 31.91- 46.55

Microclimate Tem ( °C) : 31.91- 46.55

Microclimate Tem ( °C) : 31.91- 46.55

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8.5 Micro-climate analysis Winters Thickness 0.3 m

0.6 m

0.9 m

1.2 m

1.5 m

Microclimate Tem ( °C) : 14.99 - 15.68

Microclimate Tem ( °C) : 14.99 - 15.68

Microclimate Tem ( °C) : 15.11 - 15.83

Microclimate Tem ( °C) : 15.33- 16.15

Microclimate Tem ( °C) : 14.94 - 16.07

Microclimate Tem ( °C) : 15.06 - 16.22

Microclimate Tem ( °C) : 15.20 - 16.43

Microclimate Tem ( °C) : 15.28 - 16.55

Microclimate Tem ( °C) : 15.33 - 16.62

Microclimate Tem ( °C) : 14.95 - 16.18

Microclimate Tem ( °C) : 15.06 - 16.34

Microclimate Tem ( °C) : 15.21 - 16.55

Microclimate Tem ( °C) : 15.29 - 16.68

Microclimate Tem ( °C) : 15.35 - 16.76

Microclimate Tem ( °C) : 15.08 - 16.25

Microclimate Tem ( °C) : 15.06 - 16.34

Microclimate Tem ( °C) : 15.35 - 16.63

Microclimate Tem ( °C) : 15.29 - 16.68

Microclimate Tem ( °C) : 15.51 - 16.86

Microclimate Tem ( °C) : 15.02 - 16.35

Microclimate Tem ( °C) : 15.14 - 16.51

Microclimate Tem ( °C) : 15.28 - 16.74

Microclimate Tem ( °C) : 15.37 - 16.88

Microclimate Tem ( °C) : 15.43 - 16.97

Microclimate Tem ( °C) : 14.78 - 16.63

Microclimate Tem ( °C) : 14.95 - 16.85

Microclimate Tem ( °C) : 15.06 - 17.10

Microclimate Tem ( °C) : 15.28 - 17.31

Microclimate Tem ( °C) : 15.36 - 17.42

Microclimate Tem ( °C) : 14.75 - 16.61

Microclimate Tem ( °C) : 14.90 - 16.82

Microclimate Tem ( °C) : 15.02 - 17.07

Microclimate Tem ( °C) : 15.23 - 17.29

Microclimate Tem ( °C) : 15.31 - 17.41

1m Microclimate Tem ( °C) : 15.33- 16.15

2m

Depth

3m

4m

5m

6m

7m

218 I Emergent technologies and design

Thickness 0.3 m

0.6 m

0.9 m

1.2 m

1.5 m

Microclimate Tem ( °C) : 14.72- 16.62

Microclimate Tem ( °C) : 14.87- 16.82

Microclimate Tem ( °C) : 15.15- 17.13

Microclimate Tem ( °C) : 15.19- 17.29

Microclimate Tem ( °C) : 15.27- 17.41

Microclimate Tem ( °C) : 14.69- 16.61

Microclimate Tem ( °C) : 14.83- 16.80

Microclimate Tem ( °C) : 15.10- 17.10

Microclimate Tem ( °C) : 15.15- 17.26

Microclimate Tem ( °C) : 15.23- 17.38

Microclimate Tem ( °C) : 14.67- 16.58

Microclimate Tem ( °C) : 14.80- 16.76

Microclimate Tem ( °C) : 14.99 - 17.04

Microclimate Tem ( °C) : 15.12- 17.23

Microclimate Tem ( °C) : 15.20- 17.35

Microclimate Tem ( °C) : 14.65- 16.57

Microclimate Tem ( °C) : 14.78- 16.74

Microclimate Tem ( °C) : 14.96- 17.01

Microclimate Tem ( °C) : 15.09- 17.20

Microclimate Tem ( °C) : 15.17- 17.33

Microclimate Tem ( °C) : 14.63- 16.55

Microclimate Tem ( °C) : 14.75- 16.72

Microclimate Tem ( °C) : 14.94- 16.99

Microclimate Tem ( °C) : 15.07- 17.18

Microclimate Tem ( °C) : 15.17- 17.33

Microclimate Tem ( °C) : 14.62- 16.54

Microclimate Tem ( °C) : 14.73- 16.70

Microclimate Tem ( °C) : 14.92- 16.97

Microclimate Tem ( °C) : 15.05- 17.16

Microclimate Tem ( °C) : 15.13- 17.28

Microclimate Tem ( °C) : 14.61- 16.53

Microclimate Tem ( °C) : 14.72- 16.68

Microclimate Tem ( °C) : 14.90- 16.96

Microclimate Tem ( °C) : 15.03- 17.15

Microclimate Tem ( °C) : 15.11- 17.27

Microclimate Tem ( °C) : 14.60- 16.53

Microclimate Tem ( °C) : 14.70- 16.67

Microclimate Tem ( °C) : 14.88- 16.94

Microclimate Tem ( °C) : 15.01- 17.14

Microclimate Tem ( °C) : 15.09- 17.26

8m

9m

Depth

10m

11 m

12 m

13 m

14 m

15 m

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8.5 Site visit photographs

220 I Emergent technologies and design

In-dune I 221

222 I Emergent technologies and design

In-dune I 223

224 I Emergent technologies and design

In-dune I 225

226 I Emergent technologies and design

9. References

In-dune I 227

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2 Weinstock, Michael. “The Architecture of Emergence: the Evolution of Form in Nature and Civilisation”, John Wiley and Sons Ltd, West Sussex, 2013.

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4 Population Reference Bureau, “What’s behind Desertification?”, https://www.prb.org/whatsbehinddesertification/, Accessed on January 02, 2020 5 “Migration- Free or Flee”, Desertification The Invisible Frontline, UNCCD, 2014 6 Moharana PC, Soni Shalu, Bhatt RK, “NDVI Based Assessment of Desertification in Jaisalmer District of Rajasthan in Reference to Regional Climate Variability”, XXXIII INCA International Congress, Jodhpur, September 2013, Page 01 7 Bryson RA, Baerreis DA, “Possibilities of Major Climatic Modification and their Implications: Northwest India a Case for Study”, University of Wisconsin, Madison, March 1967, Page 136-142.

8 Cooke, Ronald U., Andrew Warren, and Andrew Goudie, “Desert Geomorphology”, UCL Press, London, 1993.

9 Rathore Narpat Singh, Verma Narendra, “Impact of Climate Change in Southern Rajasthan, India”, International Journal of Water Resources and Arid Environments, 2013 10 Sharma Kriti Mohan, Singh Sarvansh, Jain Himanshu, “Reasons for the Expansion of Thar Desert & Methods to Control this Spreading”, CPUH-Research Journal, 2017 11 Singhvi A K, Kar Amal, “The aeolian sedimentation record of the Thar desert”, Journal of Earth System and Science, September 2014.

12 Sharma Kriti Mohan, Singh Sarvansh, Jain Himanshu, “Reasons for Expansion of Thar Desert and Methods to Control this Spreading”, Career Point University, Hamirpur, 2017. Page 12 13 Saha DK, “Desertification in Western Rajasthan- A Sociological View Point”, Central Arid Zone Research Institute, India, 1994, Page 01 14 Mallah Qasid Hussain, Talpur Mumtaz H, “Spatial Analysis of the Contemporary Settlement Pattern in the Thar Desert: An Ethnoarchaeological Investment”, Shah Abdul Latif University, January 2001 15 Sharma RC, “Settlement Geography of the Indian Desert”, Kumar Bros, July 2010, Page 187.

16 Sharma RC, “Settlement Geography of the Indian Desert”, Kumar Bros, July 2010.

17 Miyazaki Tadakuni, Tsunekawa Atsushi, “Remote Sensing and Social Investigation for Desertification in Western India”, National Institute for Environmental Studies, Japan, 1994 18 Weinstock, Michael. “The Architecture of Emergence: the Evolution of Form in Nature and Civilisation”, John Wiley and Sons Ltd, West Sussex, 2013.

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20 Bagnold, RA. “The Physics of Blown Sand and Desert Dune”. Dover Publications,INC. New York, 1941 21 Sharma BK, Singh Nepal ,Kumar Mahesh, “Sandy Soils of Jaisalmer District: Their Morpho-genesis and Evaluation for Sustainable Land Use”. Central Arid Zone Research Institute, Jodhpur, 2006 22 Cooke, Ronald U., Andrew Warren, and Andrew Goudie, “Desert Geomorphology”, UCL Press, London, 1993.

23 Kar Amal, “Morphology and Evolution of Sand Dunes in the Thar Desert as Key to Sand Control Measures”, Indian Journal of Geomorphology, Central Arid Zone Research Institute, Jodhpur, 1997 24 Kar Amal, “Morphology and Evolution of Sand Dunes in the Thar Desert as Key to Sand Control Measures”, Indian Journal of Geomorphology, Central Arid Zone Research Institute, Jodhpur, 1997 25 Cooke, Ronald U., Andrew Warren, and Andrew Goudie, “Desert Geomorphology”, UCL Press, London, 1993.

26 Shuai Zhong , Zhiwen Han, Aimin Li and Heqiang Du, “Research on the Application of Palm Mat Geotextiles for Sand Fixation in the Hobq Desert”, MPDI, China, 2019 27 Beret Charles Jacques, Mohamed Moustapha Oula, Saleck Meimine Oula, “Fighting Sand Encroachment: Lessons from Mauritania”, Food and Argicultural Organisation of United Nations, Rome, 2010. Page 15 28 Kenneth Pye, Samantha Saye, Simon Blott,” Sand Dune Processes and Management for Flood and Coastal Defence. Part 4: Techniques for Sand Dune Management”, Joint Defra/EA Flood and Coastal Erosion Risk Management R&D Programme, May 2007, Page 08 29 Beret Charles Jacques, Mohamed Moustapha Oula, Saleck Meimine Oula, “Fighting Sand Encroachment: Lessons from Mauritania”, Food and Argicultural Organisation of United Nations, Rome, 2010 30 Kenneth Pye, Samantha Saye, Simon Blott,” Sand Dune Processes and Management for Flood and Coastal Defence. Part 4: Techniques for Sand Dune Management”, Joint Defra/EA Flood and Coastal Erosion Risk Management R&D Programme, May 2007, 31 “ Psammophytes”. Accessed on December 10, 2019, https://encyclopedia2.thefreedictionary.com/Psammophyte 32 Kaul, R.N. “Sand dune stabilisation in Thar Desert of India: A synthesis”. Annals of Arid Zone, 1996, Page 225-240 33 Beret Charles Jacques, Mohamed Moustapha Oula, Saleck Meimine Oula, “Fighting Sand Encroachment: Lessons from Mauritania”, Food and Argicultural Organisation of United Nations, Rome, 2010.

34 Khan M.A. and Narain Pratap, “Integrated Watershed Management for Sustainability”, Arid Zone Research Association of India & Scientific Publishers (India), 2003, Page 154.

35 Chang Ilhan , Im Jooyoung and Cho Gye-Chun, “Introduction of Microbial Biopolymers in Soil Treatment for Future Environmentally-Friendly and Sustainable Geotechnical Engineering”, Sustainability, 2016.

36 Niaounakis Michael, “Building and construction applications, Biopolymer: Application and trends”, William Andrew Publications, 2015.

37 Niaounakis Michael, “Building and construction applications, Biopolymer: Application and trends”, William Andrew Publications, 2015.

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39 “Permeation (Chemical) Grouting”, Accessed on December 24, 2019. https://www.haywardbaker.com/solutions/ techniques/permeation-chemical-grouting 40 Hadi Fatehi , Maysam Bahmani and Ali Noorzad, “Strengthening of Dune Sand with Sodium Alginate Biopolymer”, GeoCongress, 2019.

41 Chang Ilhan , Im Jooyoung and Cho Gye-Chun, “Introduction of Microbial Biopolymers in Soil Treatment for Future Environmentally-Friendly and Sustainable Geotechnical Engineering”, Sustainability, 2016.

42 Asthana Vandana, Shukla AC, “Water Security in India- Hope, Despair, and the Challenges of Human Development”, Bloomsbury Publishing, 2014 43 Tangahu Bieby Voijant, Abdullah Siti Rozaimah Sheikh, Basri Hassan,Idris Mushrifah, Anuar Nurina and Mukhlisin Muhammad, “A Review on Heavy Metals (As, Pb, and Hg) Uptake by Plants through Phytoremediation”, Internal Journal of Chemical Engineering, 2011.

44 Arunkumar T, Vinothkumar K, Ahsan Amimul, Jayaprakash R, Kumar Sanjay, “Experimental Study on Various Solar Still Designs”, ISRN Renewable Energy, 2012 45 Hussain Ajaz, Tayyab Mohammed and Asif, “Indira Gandhi canal project environment and changing scenario of western Rajasthan: A case Study”, Department of Geography, Jamia Millia Islamia, July 2018, Page 18 46 Krishnan Amritha, Rajakumar Balamurugan, “Embedded Morphodynamics”, AA Emergent Technologies and Design, 2014, London, Page 129.

47 Burno Luca, Horvat Marko, Raffaele Lorenzo, “Wind Blown Sand along Railway Infrastructures: A review of Challenges and Mitigation Measures”, Journal of Wind Engineering and Industrial Aerodynamics, 2018, Page 357.

48 Larrson Magnus, “Dune: Arenaceous Anti-Desertification Architecture”, Springer Verlag Berlin Heidelberg, 2011, Page 431 49 Gupta P, “ Moisture and thermal regimes of the desert soils of Rajasthan, India, and their Management for Higher Plant Production”, Hydrological Sciences Journal, 2009.

50 Rahim M, “Behaviour of Drift Sand and Method of Dealing with it”, Pakistan Engineering Conference, 1945 51 Ikhwan M and Ruck B, “The Flow and Pressure Field Characteristics around Pyramidal Buildings”, Laboratory of Building and Environmental Aerodynamics, Germany 52 Burno Luca, Horvat Marko, Raffaele Lorenzo, “Wind Blown Sand along Railway Infrastructures: A review of Challenges and Mitigation Measures”, Journal of Wind Engineering and Industrial Aerodynamics, 2018, Page 353.

53 Singh Jagbir and Roy Amrit Kumar, “Effects of roof slope and wind direction on wind pressure distribution on the roof of a square plan pyramidal low-rise building using CFD simulation”, International Journal of Advanced Structural Engineering, 2019.

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236 I Emergent technologies and design

Qian, Chun Xiang, Hui Rong, Xiao Niu Yu, and Xin Wang. 2016. “Experiments on and Predictions about Properties of Sand Bonded by Microbe Cement.” Science China Technological Sciences 59 (8): 1186–93. https://doi.org/10.1007/s11431-0166077-3.

Raichle, Brian W, Max C Poole Dean, and Cratis D Williams. 2016. “ON-SITE BIOREMEDIATION: A SOLUTION TO TREATMENT OF GREYWATER.” Rajawat, A. , Prof, Ajai , Arya, A.s , Dhinwa, Dr. Dasgupta, Ms. Sur, Koyel , Sastry, Shri, Bhanderi. 2016. “Desertification and Land Degradation Atlas of India.”

Rathore, Mansingh, Sanjay Sharma, and Vimal Preet. 2018. “Analysis of Traditional and Existing Construction Practices for Sustainable Rural Houses in the Southern Western Part of Rajasthan.”

Robbins, Paul. 1998. “Nomadization in Rajasthan, India: Migration, Institutions, and Economy.” Human Ecology 26 (1): 87–112. https://doi.org/10.1023/A:1018748917722.

Santosh Kumar, T., B. Abraham, A. Sridharan, and Babu Jose. 2011. “Determination of Cement Content of Grouted Sandy Soils.” International Journal of Earth Sciences and Engineering 4 (6): 169–72.

Shahid, Munazzam Jawad, Muhammad Arslan, Shafaqat Ali, Muhammad Siddique, and Muhammad Afzal. 2018. “Floating Wetlands: A Sustainable Tool for Wastewater Treatment.” Clean - Soil, Air, Water. Wiley-VCH Verlag. https://doi.org/10.1002/ clen.201800120.

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10. Contribution Saumil Nagar: Contributed in formulating research background, core design ambitions and ideas, design of the settlement, strategizing background and set-up for computational experiments, developing site drawings, design drawings ,diagrams, details and designing and formatting the research book. The critical contributions being critical in analysing and redeveloping computational strategies and design interventions at all the stages of the research and synthesising all the proposals into a holistic scheme.

Medha Bansal: Contributed in formulating research background, performing a field survey on the site, conducting computational experiments at various Research and Design Development stages and documenting the entire research in text. The critical contributions being material study and development of tool paths, scripting planar and volumetric aggregation algorithms, resource calculations for phasing strategy and formulating global time steps of the proposed scheme.

Kai Yeh: Contributed in conducting computational experiments at Research Development and Design Development stages. The critical contributions were in conducting micro-climate analysis, FEA structural analysis, CFD tests for design investigation and post analysis and scripting roof aggregation algorithm based on material studies. Also contributed in developing detailed plan drawings of habitable clusters and renders.

Saumil Nagar Medha Bansal Kai Yeh [

Research

1.Introduction

2. Domain

3. Methods

240 I Emergent technologies and design

1.1

Desertification

1.2

Context: Thar desert, Rajasthan

1.2.1

Problems

2.1

Western Thar

2.1.1

Climate conditions

2.1.2

Settlement patterns

2.2

Dune dynamics

2.2.1

Aeolian processes

2.2.2

Linear sand dunes of Thar

2.3

Sand stabalisation techniques

2.3.1

Protective screens

2.3.2

Aerodynamic method

2.3.3

Plantation of dune grasses, shrubs & trees

2.3.4

Plantation of crops ( Agronomics )

2.3.5

Bio-mineralisation : Infrastructure system

2.3.6

Alginate

2.3.7

Conclusion: Sand stabilization techniques

2.4

Water resources in Thar

2.4.1

Sources

2.4.2

Treatment

2.5

Research proposal

3.1

Site visit

3.2

Digital tools

Design Logic

Experiment Logic

Scripting

Diagram

Design

Design Drawings

Content and analysis

Text editing

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Saumil Nagar Medha Bansal Kai Yeh Research

4. Research & Development

4.1

Bio-mineralization

4.1.1

Scaling up fabrication : Matrix injection

4.1.2

Fabrication of different profiles

4.1.3

Machine tool path and time steps

4.1.4

Global injection scale : Dune valley

4.2

Stepped profile

4.3

Sand channels

4.4

In-dune structures

4.4.1

Depth of injection

4.4.2

Orientation of injection matrix

4.5

Deflection system

4.5.1

Geometric exploration

4.5.2

Orientation of deflection geometry

4.5.3

Wind lift mitigation

5.1

Habitable spaces

5.1.1

Clustering and accessibility

5.1.2

Programmatic adjacencies

5.1.3

Planar aggregation of programs

5.1.4

Volumetric aggregation of programs

5.2

Deflection system: scalability

5.2.1

Materiality

5.2.2 5.

Design Development 5.2.3

Structure

5.2.4

242 I Emergent technologies and design

Material optimization Aggregation of deflecting geometries

5.2.5

Typical roof detail

5.3

Resources and infrastructure

5.3.1

Phasing

5.3.2

Hydrological system

5.3.3

Shelter belt

5.3.4

Agronomics

Design Logic

Experiment Logic

Scripting

Diagram

Design

Design Drawings

Content and analysis

Text editing

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Saumil Nagar Medha Bansal Kai Yeh

Research

6. Design Proposal

6.1

Program distribution

6.1.2

Isometric site section

6.1.3

Public space and bioremediation

6.1.4

Shelter belt

6.1.5

Agriculture

6.1.6

Habitable terraces

6.2

Cluster time-scales

6.2.1

Cluster sections

6.2.2

Cluster plan

6.2.3

cluster renderings

6.3

Global time-scales

7.1

Multiple Settlements

7.2

7. Conclusion

8. Appendix

7.3

Biomineralised sand

7.4

Social fabric and infrastructure

7.5

Scope of application

8.1

Thar desert, dune morphologies

8.2

Rajasthan livestock population trend

8.3

Major crops cultivated in Rajasthan

8.4

244 I Emergent technologies and design

Sand deflection and sedimentation

Micro-climate analysis

Design Logic

Experiment Logic

Scripting

Diagram

Design

Design Drawings

Content and analysis

Text editing

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