Assessment of hydrogeochemical characteristics and saltwater intrusion in selected coastal aquifers of southwestern India

Akshitha, Vignesh and Balakrishna, Keshava and Udayashankar, H N (2021) Assessment of hydrogeochemical characteristics and saltwater intrusion in selected coastal aquifers of southwestern India. Marine Pollution Bulletin, 173. ISSN 0025-326X

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Abstract

The principal objective of this study is to assess the saltwater intrusion and hydrogeochemical processes that affect groundwater geochemistry in the coastal aquifers of southwestern India. Groundwater samples were collected seasonally and the physico-chemical parameters determined on-site. Major ions were determined in the laboratory. Hydrochemical diagrams, ionic ratios, and multivariate statistical analysis were adopted for under�standing the groundwater chemistry. Gibbs plot identified that rock-water interaction and evaporation were the mechanisms regulating hydrogeochemistry. Ionic ratios have shown that coastal wells were contaminated with saltwater intrusion during the pre-monsoon season. Hierarchical cluster analysis classified the samples based on their quality; sample clusters with high NO3 − were in densely populated areas, whereas sample clusters with moderate salt content in the coastal areas. Another cluster showed high concentrations of salts, typically the zones of saltwater intrusion. The study concludes that influence of seasons, geogenic and anthropogenic factors contribute to the heterogeneous chemistry of groundwater

Item Type: Article
Uncontrolled Keywords: Hydrogeochemistry Ionic ratio Saltwater intrusion Cluster analysis
Subjects: Engineering > MIT Manipal > Civil Engineering
Depositing User: MIT Library
Date Deposited: 23 Dec 2021 09:56
Last Modified: 23 Dec 2021 09:56
URI: http://eprints.manipal.edu/id/eprint/157893

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