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Groundwater investigation in Thar Desert is a challenging task due to low rainfall pattern and limited recharge. In search of an alternate source of drinking water, satellite remote sensing technique has been used in delineation of palaeochannel (PC) in parts of Rajasthan. Analysis of temporal satellite images (1995–2016) show the signature of PC with increasing vegetation anomaly in an elevated terrain. Validation of the PC and its groundwater potential were demonstrated using land use land cover statistics, High-resolution Electrical Resistivity Tomography (HERT) and drilling data. 2D resistivity tomograms show that the PC aquifer is a low resistivity zone (7.98–53.6 Ωm), characterized by thick alluvium at 26 m depth. Based on the integrated analysis of satellite data and geospatial maps it has been inferred that this ancient fluvial channel (PC) has been rejuvenated due to groundwater recharge from the canal water from the north, after commissioning of IGNP canal in 1992.

geocarto international

Rejuvenation of ancient palaeochannel through groundwater recharge in Thar Desert of Rajasthan, India: investigations through remote sensing and HERT survey