%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Dar, F. A.
%A Perrin, J.
%A Ahmed, S.
%A Narayana, A. C.
%A Riotte, Jean
%T Hydrogeochemical characteristics of Karst Aquifer from a semi-arid region of Southern India and impact of rainfall recharge on groundwater chemistry
%D 2015
%L fdi:010064648
%G ENG
%J Arabian Journal of Geosciences
%@ 1866-7511
%K Hydrogeochemistry ; Karst aquifer ; Semi-arid ; Southern India
%K INDE ; ZONE SEMIARIDE
%M ISI:000354609000025
%N 5
%P 2739-2750
%R 10.1007/s12517-014-1440-9
%U https://www.documentation.ird.fr/hor/fdi:010064648
%> https://www.documentation.ird.fr/intranet/publi/2015/06/010064648.pdf
%V 8
%W Horizon (IRD)
%X The highly heterogeneous and anisotropic property of karst aquifers is a result of the dissolution and karstification of carbonate rocks. Hydrogeochemical evolution and possible water-rock interaction is therefore discussed through spatial and temporal variations in physico-chemical variables of groundwater. Samples were collected both from spring and bore wells. Dissolution of carbonate minerals is the main source of major ions (Ca2+, Mg2+ and HCO3-) in the water. Agricultural activities cause an increase in the concentration of pollution-related ions (nitrates, sulphates, chlorides, etc.). The variability of water chemistry was discussed in terms of different processes like dilution and water-rock interactions, etc. The study reveals a pronounced seasonal hydrochemical variation in the limestone aquifer. In general, the karst groundwater is of Ca-Mg-HCO3 type. Hydrogeochemical signature also helped to analyse the recharge types in the area. The semi-arid climate of the area also contributes to the increase of concentration of certain ions.
%$ 062