Hydrochemical analysis to evaluate the seawater ingress in a small coral island of India |
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Authors: | Pallavi Banerjee V S Singh Ajay Singh R K Prasad R Rangarajan |
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Institution: | (1) National Geophysical Research Institute (CSIR), Hyderabad, 500007, India;(2) Room No. 105, Groundwater Building, NGRI, Uppal Rd., Hyderabad, 500606, India |
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Abstract: | The sustainable development of the limited groundwater resources in the tropical island requires a thorough understanding
of detail hydrogeological regime including the hydrochemical behavior of groundwater. Detail analysis of chemical data of
groundwater helps in assessing the different groundwater zone affected by formation as well as sea water. Groundwater and
saline water interaction is better understood using groundwater major ion chemistry over an island aquifer. Multivariate methods
to analyze the geochemical data are used to understand geochemical evolution of groundwater. The methods are successfully
used to group the data to evaluate influence of various environs in the study area. Various classification methods such as
piper, correlation method, and salinity hazard measurements are also employed to critical study of geochemical characteristics
of groundwater to identify vulnerable parts of the aquifer. These approaches have been used to successfully evaluate the aquifer
zones of a tiny island off the west coast of India. The most part of island is found to be safe for drinking, however some
parts of island are identified that are affected by sea water ingress and dissolution of formation minerals. The analysis
has successfully leaded to identification of that part of aquifer on the island which needs immediate attention for restoration
and avoids further deterioration. |
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