Abstract
A model is traced to evaluate and enumerate the significance of vulnerability to seawater intrusion due to excessive ground water withdrawals and some anthropogenic activities at coastal aquifers. So taking these issues into account few thematic maps which were influencing the saline water intrusion were prepared and overlaid using Geographical Information Systems (GIS). Based on GALDIT method, the groundwater vulnerability cartography has been assessed. To reckon the GALDIT index it requires six parameters like aquifer type, aquifer hydraulic conductivity, depth to groundwater level (AMSL), distance from the shore, impact of existing status of seawater intrusion and thickness of the aquifer. This GALDIT is the indicator scores and summing them and dividing by the total weight for determining the relative role of each one. Apart from this an identification of saltwater intruded area is done by using indicators of saltwater intrusion like Cl/(HCO3 + CO3) ratio and Na/Cl ratio. The vulnerability areas are classified as moderate with an area of 147.31 sq. km and low covering an area of 168.72 sq. km respectively based on the thematic maps. The final thematic map can be used for management of the coastal ground water resources.
Highlights
IntroductionThe coastal aquifer systems are under to several pressures, due to urbanization and intensive agriculture
During the last decades, the coastal aquifer systems are under to several pressures, due to urbanization and intensive agriculture
The area known as younger deposits [15]; the sediments classified as alluvial plain deposits (Cauvery formation) of the Cauvery River and its distributaries, fluviomarine deltaic plain deposits (Nagapattinam formation), marine coastal plain deposits (East Coast formation)
Summary
The coastal aquifer systems are under to several pressures, due to urbanization and intensive agriculture. As this coastal aquifers constitute an important source of fresh water supply but are often confronted with the problem of seawater intrusion. The lighter fresh water lies over the seawater and the boundary surface between them is known as the freshwater-seawater interface. This distribution was attributed to a hydrostatic equilibrium existing between the two fluids of different densities. The base of the freshwater lens is adjusted at a rate of 40 m for each meter of drawdown in the well through upcoming effect
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
