title: Assessment of hydrochemical processes and groundwater hydrodynamics in a multilayer aquifer system under long-term irrigation condition: A case study of Nefzaoua basin, southern Tunisia.
abstract: The hydrochemical and isotopic investigation of the Nefzaoua aquifer system demonstrates that groundwater mineralization in is controlled by natural and anthropogenic processes including water-rock interaction and irrigation return flow. It identifies all of the water bodies that flow within the aquifer system and their circulation patterns. The isotopically depleted paleowaters, identified within the deep and intermediate aquifers, undergo significant enrichment by evaporation during irrigation and recharged the shallow aquifer by return flow. Subsequently, they infiltrate to the intermediate aquifer which receives also rainfall modern recharge.
authors.affiliation: Research Laboratory "Water-Energy-Environment", Code: LR99ES35, National School of Engineers of Sfax, University of Sfax, Tunisia. Electronic address: tarkimeriem@gmail.com.
authors.forename: M
authors.initials: M
authors.lastname: Tarki
authors.affiliation: Research Laboratory "Water-Energy-Environment", Code: LR99ES35, National School of Engineers of Sfax, University of Sfax, Tunisia. Electronic address: marouan.benhammadi@gmail.com.
authors.forename: M
authors.initials: M
authors.lastname: Ben Hammadi
authors.affiliation: Research Laboratory "Water-Energy-Environment", Code: LR99ES35, National School of Engineers of Sfax, University of Sfax, Tunisia. Electronic address: hatemmejri@engineer.com.
authors.forename: H
authors.initials: H
authors.lastname: El Mejri
authors.affiliation: Research Laboratory "Water-Energy-Environment", Code: LR99ES35, National School of Engineers of Sfax, University of Sfax, Tunisia. Electronic address: lassaad@geologist.com.
authors.forename: L
authors.initials: L
authors.lastname: Dassi
mesh_terms: D057914:Agricultural Irrigation; D000383:Agriculture; D060587:Groundwater / Q000032:analysis*; D057446:Hydrodynamics; D008903:Minerals / Q000032:analysis; D014416:Tunisia; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis; D014875:Water Pollutants, Radioactive / Q000032:analysis; D014881:Water Supply
chemical_list: D008903:Minerals; D014874:Water Pollutants, Chemical; D014875:Water Pollutants, Radioactive
keywords: Environmental isotopes; Hydrochemistry; Nefzaoua aquifer system; Southern Tunisia