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Water saturation is a main factor controlling the electrical resistivity of the ground. Electrical Resistivity Tomography (ERT) can provide 2D and 3D images of the ground, enabling targeted drilling campaigns for groundwater abstraction.
Water saturation is a main factor controlling the electrical resistivity of the ground. Electrical Resistivity Tomography (ERT) can provide 2D and 3D images of the ground, enabling targeted drilling campaigns for groundwater abstraction.
Although vertical electrical sounding (1D measurements) is often used for groundwater exploration, particularly in developing countries, the ground is often too complex for this method to provide reliable results. For fractured aquifers and heterogeneous sedimentary aquifers, 2D and 3D ERT are much more likely to provide valuable and reliable information.
Although vertical electrical sounding (1D measurements) is often used for groundwater exploration, particularly in developing countries, the ground is often too complex for this method to provide reliable results. For fractured aquifers and heterogeneous sedimentary aquifers, 2D and 3D ERT are much more likely to provide valuable and reliable information.
Groundwater exploration in South Sudan
Groundwater exploration in South Sudan
In the last few years, we supported Groundwater Relief with geophysical expertise to process and interpret 2D ERT data acquired for targeted drilling of groundwater wells.
Although the geology of South Sudan is complex, targeted drilling based on the geophysical results helped in providing productive groundwater wells to the local communities. The resistivity model below shows the varying thickness of the weathering layer and depth of the basement. Based on these results, a well was drilled and produced water to supply the community.
Imaging the hydrogeology of the Mekong Delta
Imaging the hydrogeology of the Mekong Delta
Back in 2016, with the British Geological Survey and the University of Manchester, we acquired ERT data to determine the local hydrogeology south-east of Phnom Penh, Cambodia. The target of this survey was to better understand possible surface water-groundwater interactions which were believed to contribute to elevated Arsenic levels in the groundwater.
More details about this project can be found in Uhlemann et al., 2017, Richards et al., 2017, and Richards et al., 2019.
Resistivity models showing a conductive soil layer above the more resistive sandy, water-bearing layer. Nearby boreholes confirm this lithology.
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