Recharge mode and mineralization of groundwater in a semi-arid region: Sidi Bouzid plain (central Tunisia) |
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Authors: | Hichem Yangui Kamel Zouari Rim Trabelsi Kazimierz Rozanski |
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Institution: | 1.Laboratoire de Radio-Analyses et Environnement,Ecole Nationale d’Ingénieurs de Sfax,Sfax,Tunisia;2.Faculty of Physics and Applied Computer Science,AGH University of Science and Technology,Krakow,Poland |
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Abstract: | Groundwater is the most important source of water supply in Sidi Bouzid plain located in central Tunisia. Proper understanding
of the geochemical evolution of groundwater is important for sustainable development of water resources in this region. A
hydrogeochemical survey was conducted on the Mio–Plio–Quaternary aquifer system using stable isotopes, radiocarbon, tritium
and major elements, in order to evaluate the groundwater chemistry patterns and the main mineralization processes occurring
in this system. The chemical data indicate that dissolution of evaporate minerals and evaporation are the main processes controlling
groundwater mineralization. The isotopic data show that groundwater in the study area is a mixture of recent shallow waters
located upstream and along Wadi Al Fakka bed and paleowaters located towards plain limits and discharge areas. Low 3H and 14C contents are observed in major part of the plain indicating that recharge of the aquifer occurs mainly through direct infiltration
at Wadi Al Fakka while there is no evidence of significant recharge in major part of the plain and mountains piedmonts. |
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