Quantification of water exchange between a hill reservoir and groundwater using hydrological and isotopic modelling (El Gouazine, Tunisia)

Abstract : Stable isotope compositions (18 O and 2 H), determined for underground and surface waters from the watershed of a hill reservoir and downstream from the reservoir, suggest that (i) the reservoir water, which is more or less evaporated, represents a mixture between surface waters (rainfall, runoff) and the upstream alluvial groundwater meteoric in origin; (ii) the downstream alluvial groundwater have a stable isotope composition of a previously infiltrated reservoir water. The 18 O isotope enrichment modelling of the mixed reservoir water shows that an input flux of 50 m3 day−1 is balanced by an output flux of 300 m3 day−1 when the reservoir water level is above 4.5 m, and by an output flux of 170 m3 day−1 when water levels are lower. The contri- bution of hill reservoirs to local groundwater movements must be considered in any regional scale hydrological investigations of areas that contain hill reservoirs.
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Comptes Rendus Géoscience, Elsevier Masson, 2004, 336, pp.1453-1462. 〈10.1016/j.crte.2004.08.006〉
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https://hal-bioemco.ccsd.cnrs.fr/bioemco-00454596
Contributeur : Jean-Pierre Montoroi <>
Soumis le : lundi 8 février 2010 - 21:57:55
Dernière modification le : mardi 24 avril 2018 - 17:20:12

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Olivier Grünberger, Jean-Pierre Montoroi, Slah Nasri. Quantification of water exchange between a hill reservoir and groundwater using hydrological and isotopic modelling (El Gouazine, Tunisia). Comptes Rendus Géoscience, Elsevier Masson, 2004, 336, pp.1453-1462. 〈10.1016/j.crte.2004.08.006〉. 〈bioemco-00454596〉

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