Abstract
To investigate the pathways for saline water intrusion into fresh water aquifers the electrical resistivity tomography (ERT) and ground penetrating radar (GPR) have been pooled for Nagapattinam area of Southern India. The study area has two river sub-basins, Uppanar River Basin (URB) and Cauvery River Basin (CRB). ERT carried out in URB shows very low resistivity ranging from 0.003 to 1.5 Ω m at shallow depth indicating saline water, whereas the resistivity ranges away from the river stream are 1.7–5.0 Ω m. Cauvery river basin shows resistivity range varying from 3.6 to 150 Ω m indicating a salt-fresh water mix. Similarly, few GPR profiles were carried out along ERT profiles to confirm the saline water intrusion and its pathway. Besides, the hydrochemical study reveals the same signature of saline and fresh water zones in both river basins. Water samples collected during field investigation show high total dissolved solids (TDS) content near URB and CRB river course. ERT data was correlated with GPR data to distinguish fresh and saline water zones more accurately. URB has more saline water zones at shallow depth nearer to river course and intermediate depth of saline water zones away from the river course, while CRB is having fresh water towards the inland.
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