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• W2807616268 abstract "Overexploited aquifers in drylands require a thorough assessment in order to get the best insight possible of their hydrogeological behavior and groundwater resource. With this aim we develop an integrated methodology, using the northern part of the Pampa del Tamarugal Aquifer (PTA), at the Atacama Desert, Northern Chile, as testing site. This multidisciplinary assessment was completed including 34 direct piezometric measurements in boreholes, 92 geophysical soundings (TDEM) and 9 stream gauging. Main results show strong correlation between a well-defined contrast of resistivity and the water-table of the unconfined aquifer (dry unsaturated zone ≥ 100 Ω.m vs saline groundwater in the saturated zone ≈ 10 Ω.m). TDEM results helped to map the piezometric levels and reassess the limits of the PTA. The eastern limit of the aquifer, delimited up to now by the basin floor, is repositioned from 10 to 50 km eastward in the Andean Piedmont, indicating larger groundwater reserves than those described previously. A high-resistivity anomaly (∼200 Ω.m) in the apex of alluvial fans reveals that frequent flood events cause rapid flows through the coarse permeable deposits leaching the vadose zone and contributing to recharge the aquifer (temporary recharge process). However, the updated piezometric map indicates the piedmont as the area where most of the aquifer recharge takes place. In the piedmont, at the downstream of tectonic structures or substratum outcrops, stream discharge changes reveal perennial river losses contributing to a located and permanent recharge of the PTA. This groundwater recharge process would be the main contribution to the aquifer recharge. By taking into account the regional geology, the results are summarized in a new conceptual model redefining the geometry, the spatial distribution of groundwater levels, the boundary conditions and the complex recharge processes (different flow magnitudes) in the northern part of the PTA. Finally, this study indicates an integrated and efficient methodology, providing original results that are useful for the characterization of other aquifers located in arid piedmonts and hillslopes." @default.
• W2807616268 created "2018-06-13" @default.
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• W2807616268 date "2018-10-01" @default.
• W2807616268 modified "2023-10-17" @default.
• W2807616268 title "Multidisciplinary study for the assessment of the geometry, boundaries and preferential recharge zones of an overexploited aquifer in the Atacama Desert (Pampa del Tamarugal, Northern Chile)" @default.
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• W2807616268 doi "https://doi.org/10.1016/j.jsames.2018.05.018" @default.
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