Application of Geoelectrical Resistivity Imaging Technique for the Estimation of Soil Water in Universiti Putra Malaysia
This study describes the application of electrical resistivity imaging technique in the estimation of soil water in UPM, Selangor, Malaysia. Electrical Resistivity Imaging surveys have been conducted in order to locate, delineate subsurface water resources and estimate its reserve. The resistivit...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English |
| Published: |
2009
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/7573/1/ABS_-_---__FPAS_2009_7.pdf |
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| Summary: | This study describes the application of electrical resistivity imaging technique in the
estimation of soil water in UPM, Selangor, Malaysia. Electrical Resistivity Imaging
surveys have been conducted in order to locate, delineate subsurface water resources
and estimate its reserve. The resistivity imaging surveys carried out basically
measures and maps the resistivity of subsurface materials. A 2-D geoelectrical
resistivity technique was used. Resistivity measurement was carried out using an
ABEM SAS 4000 terrameter with electrode selector system. A Wenner electrode
configuration was employed. The field survey was conducted along thirteen profiles
providing continuous coverage. Colour-modulated sections of resistivity versus depth
were plotted for all lines, giving an approximate image of the subsurface structure.
The field survey was accompanied by laboratory work. Resistivity of soil samples
and groundwater was measured and the resistivity formation ratio was obtained. The
porosity and water saturation of the same samples were calculated. A relationship between the porosity and the resistivity formation ratio as well as water saturation
was established. The laboratory established relationship between moisture content
and resistivity; the porosity against resistivity formation ratio and resistivity
formation ratio against water saturation were used to estimate the volume of soil
water above the bedrock within the study area. The porosity values were contoured
and plotted. Depth to the bedrock for each line was obtained. A 2-dimensional and 3-
dimensional representation of the subsurface topography of the area was prepared
using commercial computer software. The use of the software also enabled the
computation of the amount of soil water above the bedrock within the area
investigated.
The results showed that the layers associated with the resistivities between 30 |
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