caa a22 4500 44581473X CHVBK 20180317145222.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s10040-011-0745-y doi (NATIONALLICENCE)springer-10.1007/s10040-011-0745-y The effects of geological heterogeneities and piezometric fluctuations on groundwater flow and chemistry in a hard-rock aquifer, southern India [Elektronische Daten] [Jerome Perrin, Shakeel Ahmed, Daniel Hunkeler] L'impact des hétérogénéités géologiques et des fluctuations piézométriques sur l'écoulement et la chimie d'un aquifère de socle du sud de l'Inde Crystalline aquifers of semi-arid southern India represent a vital water resource for farming communities. A field study is described that characterizes the hydrodynamic functioning of intensively exploited crystalline aquifers at local scale based on detailed well monitoring during one hydrological year. The main results show large water-table fluctuations caused by monsoon recharge and pumping, high spatial variability in well discharges, and a decrease of well yields as the water table decreases. Groundwater chemistry is also spatially variable with the existence of aquifer compartments within which mixing occurs. The observed variability and compartmentalization is explained by geological heterogeneities which play a major role in controlling groundwater flow and connectivity in the aquifer. The position of the water table within the fracture network will determine the degree of connectivity between aquifer compartments and well discharge. The presented aquifer conceptual model suggests several consequences: (1) over-exploitation leads to a drop in well discharge, (2) intensive pumping may contribute to the hydraulic containment of contaminants, (3) groundwater quality is highly variable even at local scale, (4) geological discontinuities may be used to assist in the location of drinking-supply wells, (5) modeling should integrate threshold effects due to water-table fluctuations. Springer-Verlag, 2011 Crystalline rocks nationallicence Heterogeneity nationallicence India nationallicence Discontinuity nationallicence Conceptual model nationallicence Perrin Jerome BRGM, Water Division, Resource Assessment, Discontinuous Aquifers Unit, Indo-French Centre for Groundwater Research, Uppal Road, 500 606, Hyderabad, India aut Ahmed Shakeel National Geophysical Research Institute, Indo-French Centre for Groundwater Research, Uppal Road, 500 606, Hyderabad, India aut Hunkeler Daniel Centre of Hydrogeology and Geothermics (CHYN), University of Neuchâtel, Rue Emile Argand 11, 2009, Neuchâtel, Switzerland aut Hydrogeology Journal Springer-Verlag 19/6(2011-09-01), 1189-1201 1431-2174 19:6<1189 2011 19 10040 https://doi.org/10.1007/s10040-011-0745-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10040-011-0745-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Perrin Jerome BRGM, Water Division, Resource Assessment, Discontinuous Aquifers Unit, Indo-French Centre for Groundwater Research, Uppal Road, 500 606, Hyderabad, India aut NATIONALLICENCE 700 1- Ahmed Shakeel National Geophysical Research Institute, Indo-French Centre for Groundwater Research, Uppal Road, 500 606, Hyderabad, India aut NATIONALLICENCE 700 1- Hunkeler Daniel Centre of Hydrogeology and Geothermics (CHYN), University of Neuchâtel, Rue Emile Argand 11, 2009, Neuchâtel, Switzerland aut NATIONALLICENCE 773 0- Hydrogeology Journal Springer-Verlag 19/6(2011-09-01), 1189-1201 1431-2174 19:6<1189 2011 19 10040 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer