Characterization of Aquifer Using Geo-electrical Resistivity Method in Lower Tamirabarani River Basin, Tamil Nadu, India

The main objectives of this study are to find out the aquifer thickness and characterization of the aquifer by using geo-electrical resistivity Schlumberger’s technique in the lower Tamirabarani River Basin, Tamil Nadu, India. The electrical resistivity method, viz. Schlumberger configuration (48 VES Survey), was conducted using equal grid intersection points. The primary field data was interpreted using the manual curve-matching method at the field. Subsequently, geo-electrical sounding data can be calculated and analysed digitally by using the IPI2WIN software. The nine 2D profiles were prepared using IPIWIN software. Apart from that, VES up to 100 m depth categorises five subsurface resistivity layers. As a result of seawater seeping into the groundwater, small areas of less than 10 Ωm were found along the coastal track along the seashore villages like Palayakal, Kayalpattinam, Tiruchchendur, and Perungalam. The shallow depth (3.5–30 m of aquifer) of groundwater quality is affected by seawater intrusion.