Assessment of aquifer vulnerability to saltwater intrusion in the D.K. District, Karnataka

Lathashri, U A and Mahesha, A (2008) Assessment of aquifer vulnerability to saltwater intrusion in the D.K. District, Karnataka. Journal of Applied Hydrology, 21 (1&2). pp. 113-123.

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The coastal aquifers constitute important sources of freshwater. Many Indian coastal areas are heavily urbanized, a fact that makes the need for freshwater even more acute. There has been no methodology for evaluating the spatial distribution of the saltwater intrusion which essentially takes into account hydro-geological factors. It is therefore necessary to adopt a mapping system that is simple to apply using the data generally available and yet capable of making best use of those data in a technically valid and useful way. In the present study, the GALDIT index is used to assess the vulnerability of the aquifer to saltwater intrusion in the Pavanje and Gurpur basins of D.K. district, Karnataka. The index is developed based on the most important factors controlling saltwater intrusion. The wells selected for the investigation includes open wells and ponds. The GALDIT Index is obtained by computing the individual indicator scores and summing them up for a given location at a given time. Once the GALDIT index has been computed, it is possible to identify areas that are more likely to be susceptible to saltwater intrusion than other areas. Higher the index, greater is the saltwater intrusion potential. From the studies it is found that the entire study area falls under three categories of vulnerability i.e. low, moderate and highly vulnerable to saltwater intrusion according to GALDIT rating. The study area is worst affected by saltwater intrusion in the month of April. The wells which are very close to the coast and are within a distance of 300 m, were found to be saline throughout the year. The area on the northern side viz Chelaru, Mukka, Pavanje and Haleyangadi are less affected during the post-monsoon season (Nov to Jan) and are highly vulnerable during the summer season (Feb to May). The areas down south viz Baikampady, Kenjar, Jokatte and Kulai, are also seen to be greatly affected by saltwater intrusion in the months of April and May. In all, the results from the study would be useful for planning further developments in the region or detailed investigation on the advancement of saltwater intrusion.

Item Type: Article
Subjects: Engineering > MIT Manipal > Civil Engineering
Depositing User: MIT Library
Date Deposited: 13 Oct 2016 15:05
Last Modified: 13 Oct 2016 15:05

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