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खुला एक्सेस

अमूर्त

Evalauation of Groundwater Potential Zones using Electrical Resistivity Response and Lineament Pattern in Uppodai Sub Basin, Tambaraparani River, Tirunelveli District, Tamilnadu, India

Jeyavel Raja Kumar T, Dushiyanthan C, Thiruneelakandan B, Suresh R, Vasanth Raja S, Senthilkumar M and Karthikeyan K

The present attempt has been made to identify potential groundwater zones using electrical resistivity and lineament pattern in the dry watershed of Uppodai. The area comprises Archean hard rocks of charnockite and biotite gneiss. The major types of soil are red sandy soil and black cotton soils. Depth to the water table varies from 1 m to 10 m below the ground level. About 23 Vertical Electrical Soundings were carried out at different locations with AB/2 spreading up to 100 m by Schlumberger configuration. The measured apparent resistivity values were interpreted by curve matching technique using RESIST87 software. Lineament map was prepared to understand its influence on the ground water system. A, K,AK and KH are the curve types obtained in the study area. The resistivity values for first , second and third layers are varied from 3.6 Ωm to 256 Ωm; 65.7 Ωm to 2022.3 Ωm and 161.5 Ωm to 2500 Ωm respectively. The layer thickness of first and second layers observed with the variation of 0.7 m to 41.5 m and 8.3 m to 65.6 m. As the resistivity value observed with a wide variation, the resistivity value below100 Ωm of second layer has been conveniently taken for potential groundwater zones. The low resistivity with high second layer thickness zones is very limited and promising zones were observed at some patches in the present study area. Two sets of lineament pattern have identified with NW-SE and NE-SW directions. The density and length of lineaments were comparatively high with NW-SE pattern in the study area and not seems a potential aquifer at shallow depths.