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Geophysics for Solar Energy Installations TerraDat has accumulated a wealth of experience over the years, providing geophysical ground exploration services to the energy industry. By working alongside energy developers TerraDat has developed a suite of geophysical techniques ideally suited to the main needs of solar farm developers. Archaeological magnetic gradiometry surveys are often required in the early stages of solar farm development. Due to the large areas involved, these surveys can be expensive and time consuming. TerraDat’s state of the art rapid archaeological acquisition system counters this, by providing up to 40ha of high-resolution magnetic gradiometry data per day. The increased efficiency of this system is because we use a towed multi-sensor rig. The survey results are delivered as fully interpreted plots in popular CAD/GIS formats to easily integrate with client’s systems .

Solar Energy

TechnicalNote

To optimise PV locations and associated infrastructure works, a combination of magnetic, ground conductivity and microgravity surveys can be used to map underground hazards such as buried services, UXO, mine workings, solution features, voids and fracture zones.

1007 58.021

58.23 Hedge

60.09

Grass

60.51

60.92

k

Ht=2.0m

59.48

60.23

p

q q

o

n

65.204

1009

Rapid Archaeological Surveys

a

61.61

n

n

h

62.95

n

61.09

c

61.49

60.85

Underground Hazard Mapping

h

m

57.65 57.64

g

58.94

62.13

57.12

67.28

57.67

Pond

Ht=2.2m

Hedge

61.17

61.06

58.92

TH

57.52

j

59.80

57.74

f 62.77

Grass

Hedge Ht=2.2m

58.71

63.75

Ht=2.0m

e

b

1005 62.533

e

Hedge

62.80

Grass

n

Geotechnical Information

Example of finalised data - magnetic gradiometry to the left and interperetive plot to the right, data can be suppled in a variety of CAD and GIS formats

The Sensys rig can be towed by a variety Buried features revealed by ground conductivity survey of vehicles, from ATVs to tractors Conductive till

25

Soil resistivity survey

Chainage (m) 30

35

40

Resistive bedrock

45

50

55

60

300

0

Surface gravels

40

60 Test 1 Test 2 80

Elevation

“a” Spacing

20

Increasing resistivity

0

20

Resistivity (Ohm.m) 100 200

*Cost Effective *Non-invasive *Rapid Ground Coverage *Environmentally Friendly *Swift Mobilisation/Global Coverage

Resistivity tomography surveys are used to provide information on the shallow geology and soil electrical properties for earthing design. This approach is more accurate than the traditional 4pin method as it is possible to derive more reliable resistivity values. Thermal properties of the soil can be analysed by using a thermal resistivity meter to acquire data either at surface, or within trial pits.

Resistivity vertical electrical sounding (left) and tomographic section (right) Contact Simon Hughes for more info; simon@terradat.co.uk

TerraDat (UK) Ltd - Tel (08707 303050) www.terradat.co.uk

Solar Energy Installations & Geophysical Investigations  

Ground investigations using non-invasive methods

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