Senapathi VENKATRAMANAN, Thirunavukkarasu RAMKUMAR & Irudhayanathan ANITHAMARY
Department of Earth Sciences, Annamalai University, Chidambaram, Tamilnadu, India,
*E-mail:venkatramanansenapathi@gmail.com.

A STATISTICAL APPROACH ON HYDROGEOCHEMISTRY OF GROUNDWATER IN MUTHUPET COASTAL REGION, TAMILNADU, INDIA

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Seventy two groundwater samples were collected from February to September 2007 covering in three seasons for delineating hydrochemical nature in Muthupet coastal area. Dominance of cations are in the following order Na>Ca>K>Mg and Cl>SO₄>HCO₃>NO₃ by anions in three seasons. From the Piper trilinear diagram, it is observed that the majority of groundwater samples are Na-Cl and Ca-Mg-SO₄ facies clearly indicates seawater incursion. The statistical treatment of the data (cluster, factor analysis) indicates that seawater incursion is the dominant process that influences the quality of the groundwater in the coastal region.