6 research outputs found
Geochemical and isotopic signatures for the identification of seawater intrusion in an alluvial aquifer
Seawater intrusion is one of the alarming processes that reduces the water
quality and imperils the supply of freshwater in coastal aquifers. The region,
north of the Chennai city, India is one such site affected by seawater
intrusion. The objective of this study is to identify the extent of seawater
intruded area by major geochemical and isotopic signatures. A total of 102
groundwater samples were collected and analysed for major and minor ions.
Groundwater samples with electrical conductivity (EC) greater than 5000 μS/cm
and a river mouth sample were analyzed for Oxygen-18 (δ 18O) and Deuterium (δ
2H) isotopes to study their importance in monitoring seawater intrusion. The
molar ratio of geochemical indicators and isotopic signatures suggests an
intrusion up to a distance of 13 km from the sea as on March 2012 and up to
14.7 km during May 2012