Characterization of the shear zone with pole–pole electrical resistivity tomography (ERT) was carried out to explore deep groundwater potential zone in a water scarce granitic area. As existing field conditions does not always allow to plant the remote electrodes at sufficiently far of distance, the effect of insufficient distance of remote electrodes on apparent resistivity measurement was studied and shown that the transverse pole–pole array affects less compared to the collinear pole–pole array. Correction factor have been computed for transverse pole–pole array for various positions of the remote electrodes. The above results helped in exploring deep aquifer site, where a 270 m deep well was drilled. Temporal hydro-chemical samples collected during the pumping indicated the hydraulic connectivity between the demarcated groundwater potential fractures. Incorporating all the information derived from different investigations, a subsurface model was synthetically simulated and generated 2D electrical resistivity response for different arrays and compared with the field responses to further validate the geoelectrical response of deep aquifer set-up associated with lineament.
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Acknowledgements
The authors acknowledge the support provided by the Director, NGRI, Hyderabad to carry out this work. They are also thankful to Andhra Pradesh Special Police, 7th Battalion, Dichpally, Nizamabad for the financial and logistic support to carry out this study. Special thanks to APSP officers Sri T Vijay Kumar, Executive Engineer, Sri V Ravi Kumar, Deputy Executive Engineers, Sri Srinivas and Sri Devender, Assistant Engineers for taking the extra care. Help extended by Dr Dewashish Kumar, Mr T Yellappa, NGRI in data collection and their valuable suggestions in preparing the manuscript are greatly acknowledged. The constructive comments and suggestions by anonymous reviewers are greatly appreciated, which has tremendously improved the quality of the paper.
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CHANDRA, S., NAGAIAH, E., REDDY, D.V. et al. Exploring deep potential aquifer in water scarce crystalline rocks. J Earth Syst Sci 121, 1455–1468 (2012). https://doi.org/10.1007/s12040-012-0238-y
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DOI: https://doi.org/10.1007/s12040-012-0238-y