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Why seawater intrusion has not yet occurred in the Kaluvelli-Pondicherry basin, Tamil Nadu, India

Hydrogeology journal, 2017-09, Vol.25 (6), p.1893-1907 [Peer Reviewed Journal]

Springer-Verlag Berlin Heidelberg 2017 ;Hydrogeology Journal is a copyright of Springer, 2017. ;Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 1431-2174 ;EISSN: 1435-0157 ;DOI: 10.1007/s10040-017-1558-4

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Title:
Why seawater intrusion has not yet occurred in the Kaluvelli-Pondicherry basin, Tamil Nadu, India
Author: Vincent, Aude ; Violette, Sophie
Subjects: Aquatic Pollution ; Aquifers ; Arid climates ; Aridity ; Basins ; Boundary conditions ; Climate ; Climate models ; Climatology ; Coastal aquifers ; Data acquisition ; Depletion ; Earth and Environmental Science ; Earth Sciences ; Geochemistry ; Geology ; Geophysics/Geodesy ; Groundwater ; Groundwater depletion ; Groundwater levels ; Groundwater recharge ; Hydrodynamics ; Hydrogeology ; Hydrologic models ; Hydrology ; Hydrology/Water Resources ; Intrusion ; Irrigation ; Leakage ; Mineralization ; Modelling ; Multilayers ; Offshore ; Parameter sensitivity ; Saline water intrusion ; Sciences of the Universe ; Sea level ; Seawater ; Seawater intrusion ; Sedimentary basins ; Semiarid climates ; Semiarid environments ; Three dimensional models ; Waste Water Technology ; Water Management ; Water Pollution Control ; Water Quality/Water Pollution
Is Part Of: Hydrogeology journal, 2017-09, Vol.25 (6), p.1893-1907
Description: Worldwide, coastal aquifers are threatened by seawater intrusion. The threat is greatest when aquifers are overexploited or when recharge is low due to a semi-arid or arid climate. The Kaluvelli-Pondicherry sedimentary basin in Tamil Nadu (India) presents both these characteristics. Groundwater levels in the Vanur aquifer can reach 50 m below sea level at less than 20 km inland. This groundwater depletion is due to an exponential increase in extraction for irrigation over 35 years. No seawater intrusion has yet been detected, but a sulphate-rich mineralization is observed, the result of upward vertical leakage from the underlying Ramanathapuram aquifer. To characterize the mechanisms involved, and to facilitate effective water management, hydrogeological numerical modelling of this multi-layered system has been conducted. Existing and acquired geological and hydrodynamic data have been applied to a quasi-3D hydrogeological model, NEWSAM. Recharge had been previously quantified through the inter-comparison of hydrological models, based on climatological and surface-flow field measurements. Sensitivity tests on parameters and boundary conditions associated with the sea were performed. The resulting water balances for each aquifer led to hypotheses of (1) an offshore fresh groundwater stock, and (2) a reversal and increase of the upward leakage from the Ramanathapuram aquifer, thus corroborating the hypothesis proposed to explain geochemical results of the previous study, and denying a seawater intrusion. Palaeo-climate review supports the existence of favourable hydro-climatological conditions to replenish an offshore groundwater stock of the Vanur aquifer in the past. The extent of this fresh groundwater stock was calculated using the Kooi and Groen method.
Publisher: Berlin/Heidelberg: Springer Berlin Heidelberg
Language: English
Identifier: ISSN: 1431-2174
EISSN: 1435-0157
DOI: 10.1007/s10040-017-1558-4
Source: ProQuest Central

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Why seawater intrusion has not yet occurred in the Kaluvelli-Pondicherry basin, Tamil Nadu, India

Springer-Verlag Berlin Heidelberg 2017 ;Hydrogeology Journal is a copyright of Springer, 2017. ;Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 1431-2174 ;EISSN: 1435-0157 ;DOI: 10.1007/s10040-017-1558-4

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