SEAWATER INTRUSION – FRESHWATER SHALLOW AQUIFER IN COASTAL REGION OF CUDDALORE DISTRICT, TAMILNADU
Publication Date : 02/05/2021
In the long coastal line of India, the coastal line of Tamilnadu is located at southeast coast of Bay of Bengal and Indian Ocean. This coastal line extends from Thiruvallur to Kanniyakumari district and holds about 13 districts along the coastline. The rapid urbanization and industrialization along the seashore have increased the water demand leading to the over exploitation of the groundwater. The rapid depletion of groundwater, shrimp farm and aqua culture activities resulted in the seawater intrusion in the freshwater aquifer.therefore, preventing and conserving of the groundwater aquifer has become the essential action. This study deals with the assessment of salinity intrusion in freshwater aquifer by means of geophysical investigation and borehole lithology data at the coastal zone of Parangepettai block which covers the area in the southeastern coast of Cuddalore district, Tamilnadu. The geophysical investigation was carried out by means of electrical resistivity tomography survey to identify the subsurface layer along with their resistivity values which provides the pseudo section. Finally, by referring to the geophysical resistivity ERT profiles and the lithology data were used to identify the seawater intrusion. The interface between the seawater and freshwater was discussed and concluded to recommend the remedial measures in order to control the salinity intrusion in the freshwater aquifer.
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