Characterization of Recharge Mechanisms and Sources of Groundwater Salinization in Ras Jbel Coastal Aquifer (Northeast Tunisia) Using Hydrogeochemical Tools, Environmental Isotopes, GIS, and Statistics

Journal of Chemistry. 2017;2017 DOI 10.1155/2017/8610894

 

Journal Homepage

Journal Title: Journal of Chemistry

ISSN: 2090-9063 (Print); 2090-9071 (Online)

Publisher: Hindawi Limited

LCC Subject Category: Science: Chemistry

Country of publisher: United Kingdom

Language of fulltext: English

Full-text formats available: PDF, HTML, ePUB, XML

 

AUTHORS

Jamila Hammami Abidi (Faculty of Sciences of Tunis, Laboratory of Mineral Resources and Environment, University of Tunis El Manar, 2092 Tunis, Tunisia)
Boutheina Farhat (Faculty of Sciences of Tunis, Laboratory of Mineral Resources and Environment, University of Tunis El Manar, 2092 Tunis, Tunisia)
Abdallah Ben Mammou (Faculty of Sciences of Tunis, Laboratory of Mineral Resources and Environment, University of Tunis El Manar, 2092 Tunis, Tunisia)
Naceur Oueslati (Regional Commission for Agricultural Development, av. Hassen Nouri, 7000 Bizerte, Tunisia)

EDITORIAL INFORMATION

Blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 16 weeks

 

Abstract | Full Text

Groundwater is among the most available water resources in Tunisia; it is a vital natural resource in arid and semiarid regions. Located in north-eastern Tunisia, the Metline-Ras Jbel-Raf Raf aquifer is a mio-plio-quaternary shallow coastal aquifer, where groundwater is the most important source of water supply. The major ion hydrochemistry and environmental isotope composition (δ18O, δ2H) were investigated to identify the recharge sources and processes that affect the groundwater salinization. The combination of hydrogeochemical, isotopic, statistical, and GIS approaches demonstrates that the salinity and the groundwater composition are largely controlled by the water-rock interaction particularly the dissolution of evaporate minerals and the ion exchange process, the return flow of the irrigation water, agricultural fertilizers, and finally saltwater intrusion which started before 1980 and which is partially mitigated by the artificial recharge since 1993. As for the stable isotope signatures, results showed that groundwater samples lay on and around the local meteoric water line LMWL; hence, this arrangement signifies that the recharge of the Ras Jbel aquifer is ensured by recent recharge from Mediterranean air masses.