Quantification of water exchange between a hill reservoir and groundwater using hydrological and isotopic modelling (El Gouazine, Tunisia) - Bioemco Access content directly
Journal Articles Comptes Rendus Géoscience Year : 2004

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.

Dates and versions

bioemco-00454596 , version 1 (08-02-2010)

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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, 2004, 336, pp.1453-1462. ⟨10.1016/j.crte.2004.08.006⟩. ⟨bioemco-00454596⟩
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