HEALTHY DOWNSTREAM OF MIN RIVER - RETHINKING SEDIMENTS FOR SUSTAINABLE LANDSCAPE
XINYAO CHEN 1061677
CONTENT DESIGN STATEMENT
PART 1 CONTEXT & SITE ANALYSIS
PART 3 DETAIL DESIGN
POLITIC LENS
MASTER PLAN
MAPPING
PHASING PLANS
SITE SELECTION SITE BACKGROUND SEAWATER BACKFLOW ANALYSIS RIVERWAY CHANGES PRECEDENT
PART 2 DESIGN PROPOSAL PRECEDENT BUBBLE DIAGRAM DESIGN DERIVATION CURRENT ANALYSIS SYSTEM CONSIDERATION SEDIMENT & WETLAND STRATEGIES SEMI-OPEN WETLAND CONCEPT
SECTION & PERSPECTIVES
DETAIL PLAN REVETMENT DESIGN
STRUCTURE CATALOGUR PHASING OF SEDIMENT INTERCEPTION GRID DISTRIBUTION PLANTING DESIGN
DESIGN STATEMENT
The project is located along the Min River in Fuzhou, a river that is one of the major water systems that nurtures the Fujian region. The design goal is to identify ways to address sediment loss in this area through riverbed sedimentation and wetland loss, and to attempt to use these developments to make some contribution to urban landscape design. The planning of the project is based on the concepts of sediment interception and wetland restoration, with sediment interception grids placed according to the direction of water flow for sediment sorting and collection. The design proposes a partially open unit wetland design that collects sediment to redefine public expectations for wetland creation and restoration and to reimagine a new look for the lower Min River shoreline.
PART 1 CONTEXT & SITE ANALYSIS POLITIC LENS MAPPING SITE SELECTION SITE BACKGROUND SEAWATER BACKFLOW ANALYSIS RIVERWAY CHANGES LONGTERM PLAN
POLITIC LENS Fuzhou Riverside Economic Zone
Restoration of industrial waterways - regular dredging of the river
Illegal sand mining in the lower reaches of the river
West Lake Park
MAPPING Min River Upstream
CBD
Fuzhou, a coastal city in southeastern China.
Mountain Gu
Gaogai Mountain Park
PRO POS SITE ED
Shipbuilding Culture Theme Park
Wulong River Longxiang Island
Min River Downstream
THE ENTRANCE TO THE SEA Connected to the East China Sea
SITE CONDITION Shoreline
Seawater Freshwater Junciton line
Waterfront
The project is located along the Min River in Fuzhou, a coastal city in southeastern China. The Min River is one of the most important freshwater systems in the coastal city of Fuzhou, connecting to the East China Sea. Development along the Min River is critical to the ecological, hydrological and economic health of the city of Fuzhou. The site is located at the lower reaches of the Min River, the junction of Fuzhou's new and old cities. According to the planning of Fuzhou City, the original functions of the urban space around the site will be transformed. The landscape needs have been raised accordingly.
Highway
Dune
SITE BACKGROUND History & Current Issues
Historically, this area was used for industrial development and consisted mainly of sand quarries and building material plants.
Even though the mining of river sand is now prohibited by the government, the impact of the development and industrialization of the Min River in the 19th and 20th centuries is showing its full impact.
The lack of sediment has caused the lower Min River's shoreline to collapse, threatening the safety of surrounding residents.
Excessive artificial mining of river sand has seriously threatened the stability of the banks and riverbed. Sediment loss has led to a steady decline in the riverbed.
There are still illegal sand mining boats mining river sand in the lower reaches of the Min River today.
SEAWATER BACKFLOW ANALYSIS North District Water Supply Plant Intake Southeast Water Plant Intake (Emergency backup)
Sediment loss has further aggravated the backup of seawater from the lower reaches of the Min River into the sea. The current freshwaterseawater junction line has receded next to the site, crossing over a water intake of a nearby water plant and affecting the safety of drinking water.
Fei Fengshan Water Supply Plant Intake (under construction)
SIT E Yixu Water Supply intake
The dividing line of seawater river water nowadays
Mawei Water Supply Plant Intake
The dividing line of seawater river water in 2000 Seawater backflow (Saltwater) Min Riverwater (Fresh Water) Urban Expressway Urban Main Roads Water supply plants in the area Water supply plant affected by sea water
RIVERWAY CHANGES BASED ON HISTORICAL MAPS
2000
SITE
Nearly 60% of the wetlands were lost within the site boundaries.
Wetland Loss Wetland Loss (2000-2022)
Shoreline Hardening
River Channel Widens & Nearshore Erosion
Hard Shoreline Soft Shoreline
Sediment Input Loss River Channel Current Wetland
2021
Ecologically, sediments are also important for shaping and maintaining wetland habitats on which native organisms in the lower reaches of the river depend. Sediment loss and river channel subsidence have contributed to wetland erosion in the lower Min River over the past two decades.
LONG TERM PLAN
FIRST YEAR
A representative site in the Min River was selected to provide a landscape response to the site's problems, with minimal intervention to achieve maximum landscape transformation.
SEVERAL YEARS
After several years, the same landscape measures can be extended to other parts of the Min River to further mitigate sediment loss and provide a diverse landscape experience.
PRECEDENT - ASLA Sensitive Structures: A Landscape Approach for Great Lakes Coasts
PRECEDENT
PRECEDENT
PRECEDENT
PART 2 DESIGN PROPOSAL BUBBLE DIAGRAM BUBBLE DIAGRAM DESIGN DERIVATION CURRENT ANALYSIS SYSTEM CONSIDERATION SEDIMENT & WETLAND STRATEGIES SEMI-OPEN WETLAND CONCEPT
BUBBLE DIAGRAM
DESIGN DERIVATION SAFETY&CIRCULATION To protect the public by collecting sediment to reinforce the river banks and provide the necessary protection against waves and subsidence. It is also combined with arranging multi-level flow lines to enrich the landscape experience of the surrounding citizens.
ECOLOGIES To use the collected sediments to restore the soft riverbed and restore the historical riparian wetlands. The redistribution of sediments in the nearshore zone is achieved.
ENVIRONMENT To enrich the ecosystem of the riverbank, nourish the nearshore environment, and enhance ecological connectivity, while providing waterfront activity space for citizens and stimulating the vitality and healthy development of the site.
CURRENTS ANALYSIS
Propose Site
a
b
Shoreline setback F
a
Force of water flow
Fast flow
rate Fast flow
The barge of the site is more susceptible to river erosion because it is located in a bend of the river.
水流分析
rate
b
Small tributary Potential nearshore placement zone
The focus of the sediment design is on the use of water flow. The flow direction of the Min River as well as the flow velocity, with an average velocity of 0.14 meters per second, were analyzed to serve as the basis for the design.
@Water Flow Sourc: Released by the Fuzhou Institute of Water Resources.
SYSTEM CONSIDERATION CIRCULATION
Existing Block Street Net
+
City Sidewalk
Wetland walkway
=
GREEN SYSTEM
Neighborhood Gardens
+
Forest
+
Wetland Park
Wetlands
=
PROGRAM Forest Park
=
The proposed scheme includes the overall plan for the entire community site and docking facility, boat launching ramp, ecological park, and nature trails with the consideration about the circulation, green systems, and programs.
SEDIMENT & WETLAND STRATEGY OPTIMIZED STRATEGY FOR A HEALTHY RIVERBANK, PRECEDENT INSPIRED
SEMI-OPEN WETLAND CONCEPT
PART 3 DETAIL DESIGN MASTER PLAN PHASING PLANS SECTION & PERSPECTIVES
DETAIL PLAN REVETMENT DESIGN
STRUCTURE CATALOGUR PHASING OF SEDIMENT INTERCEPTION GRID DISTRIBUTION PLANTING DESIGN
MASTER PLAN
④ ①
②
⑤
⑥
③ ⑧
⑦
⑨ ⑩
① Sediment Interceptor Grids
⑥ Woodland Walking Path
③ Elevated Walkway
⑧ Waterfront Activity Platform
② Deck
④ Wetland Walkway ⑤ Natural Wetland
⑦ Aquatic Plant Conservation Area ⑨ Landscape Bridge ⑩ Viewing Platform
The master plan is planned based on the concepts of sediment interception and restoration of wetlands. A grid was placed according to the direction of water flow to intercept sediment to provide material for the artificial wetland. The hard concrete banks, originally designed for flood control, are transformed into a green infrastructure system, creating an open space and waterfront corridor.
PHASING PLAN PHASING 1
WETLAND WETLAND
VEGETATION WOODLAND MEADOW
ACTIVITY HIGH DENSITY LOW DENSITY
PHASING 2
PHASING 3
SECTION PERSPECTIVE 01 The elevated event deck provides a great view of the river and the experience of being close to the wetlandsv
Wetland Trestle
Native wetlands, immobilized by interception units
A forest walkway that provides a healthy place for people to exercise
SECTION PERSPECTIVE 02 Floating plant interception grid
Citizen's waterfront platform, providing open river front activities Aquatic plant interception, multi-stratified habitat composed of floating plants
Connection of the site to the city bridge
⑥
DETAIL PLAN ⑤
UPSTREAM OF MING RIVER PEBBLE GABION
DREDGE MATERIALS
④
③
10M
②
①
20M
Depending on the width of the river, the module of the grid is set at 10 meters, and the ⑩ wetland is roughly adjusted to this module to accommodate the flow of water. In terms of materials,to achieve environmental and landscape sustainability. I will reuse dredged material from the upper reaches of the Min River. Pebbles and reefs cleared from the upstream will be used as infill inside the Gabions. This will shape the structure of the UNIT while also serving as a plant and biological shelter.
LEGEND ① Viewing Platform ② Natural Wetland ③ Elevated Walkway
④ Sediment Interceptor Grids ⑤ Waterfront Walkway ⑥ Woodland Walking Path
PERSPECTIVE HABITAT NET
Inner
REVETMENT
Floating Deck
Aquatic Plants
SEDIMENT CAPTURE
Pedestrian & Bikeway
Habitat Net Structure
+5.80 +6.80 +5.00
New wetland
Sediment Capture Structure
STRUCTURE CATALOGUE SAND CAPTURE STRUCTURE
The structure is designed with the same geometry, and will be deformed into the grids.
HIGH SPEED
LOW SPEED
PHASING OF SEDIMENT INTERCEPTION TYPE 1
TYPE 2
TYPE 3 The structure is more closed
Long-term accumulation can become sand dunes.
Sediment partially immobilized
C aptured plant s c an form a habitat for floating plants and animals.
Partially dispersed in the river
TYPE 1 is better for capturing sediments with larger masses such as coarse sand
TYPE 2 has a good effect on the settlement of clay in river water.
TYPE 3 has a better fixation effect on the floating plants in the river water
GRID DISTRIBUTION
Edge Improvement
TYPE 2 can use the collected clay to strengthen and soften the barge.
River Ecology Restoration
Extent Wetland
T YPE 1 can work to stabilize existing wetlands and expand new artificial wetlands.
TYPE 3 allows for the creation of new ecological habitats along the banks of existing industrial areas.
PHASING OF GROWING WETLANDS WET
DRY
Casuarina equisetifolia
Festuca arundinacea
Salt Tolerance: Strong
Salt Tolerance: Strong
Rhizophora apiculata
Limonium bicolor
Salt Tolerance: Strong
Salt Tolerance: Strong
Heritiera littoralis Dryand.
Leucaena leucocephala
Salt Tolerance: Medium
Salt Tolerance: Medium
Fraxinus chinensis.
Rosa chinensis
Salt Tolerance: Medium
Salt Tolerance: Medium
Hibiscus hamabo
Parthenocissus tricuspidata
Salt Tolerance: Medium
Salt Tolerance: Strong
Sambucus williamsii
Ligustrum obtusifolium
Salt Tolerance: Medium
Salt Tolerance: Medium
Sapium sebiferum
Buddleja lindleyana
Salt Tolerance: Medium
Salt Tolerance: Medium
Melia azedarach
Vitex trifolia
Salt Tolerance: Medium
Salt Tolerance: Strong
Melia azedarach
Suaeda salsa
Salt Tolerance: Strong
Salt Tolerance: Strong
Tamarixchinensis
Imperata cylindrica
Salt Tolerance: Strong
Salt Tolerance: Strong