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标题：Past and present groundwater recharge processes in the Kairouan plain aquifer (Central Tunisia) inferred from geochemical analyses
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作者：Safouan Ben Ammar ; Leila Jeribi ; Guillaume Favreau 等
期刊名称：Science et changements planétaires / Sécheresse
印刷版ISSN：1147-7806
电子版ISSN：1777-5922
出版年度：2009
卷号：20
期号：1
页码：87-95
DOI：10.1684/sec.2009.0160
出版社：John Libbey Eurotext
摘要：Figures See all figures Authors Safouan Ben Ammar , Leila Jeribi , Guillaume Favreau , Kamel Zouari , Christian Leduc , Monique Oi , Jemaiel M’barek , Ridha Beji Laboratoire de radio-analyses et environnement ENI Sfax BP W 38 Sfax Tunisie, IRD, UMR HSM et UMR G-EAU Université Montpellier-II CC MSE 34095 Montpellier cedex France, Centre national des sciences et technologies nucléaires, 2020 Sidi-Thabet, Tunisie, Société nationale d’exploitation et de distribution des eaux Montfleury 1008 Tunis Tunisie, Direction générale des ressources en eau Rue de la Manoubia Tunis Tunisie Key words: dam, hydrogeochemistry, isotopes, natural recharge, Tunisia DOI : 10.1684/sec.2009.0160 Page(s) : 87-95 Published in: 2009 The phreatic aquifer of the Kairouan plain (semiarid, central Tunisia, 3000 km ²) is made up of thick alluvial sedimentary formations of Plio-Quaternary origin. This aquifer represents a key resource for regional development and irrigated agriculture (e.g., watermelon, cereals). For the past few decades, over-exploitation of groundwater resources and building of dams located in the upstream part of the plain to prevent flash floods have led to dramatic changes in recharge processes and the water balance of the aquifer. Water chemistry and isotopic data ( ¹⁸O, ²H, ³H, ¹⁴C, ¹³C) confirm that groundwater recharge previously depended mainly on wadi floods. Chemical data suggests that water-rock interaction is the main process contributing to groundwater salinity. The isotopic approach reveals that a significant part of recent recharge comes from uncontrolled dam leakage (El Haouareb dam) or from surface water stored in dams and released during high stages (Sidi Saad dam).
关键词：dam; hydrogeochemistry; isotopes; natural recharge; Tunisia