Modélisation de l'impact de la création d'un lac artificiel sur la qualité des eaux souterraines (cas de la dépression de Moknine - Tunisie)

Modelling an artificial Lake creation impact on the ground water quality (case of the Moknine depression - Tunisia)

¹ Assistante à la Faculté des Sciences de Sfax, Laboratoire d'Hydrogéologie-Géothermie, Ecole Nationale d'Ingénieurs de Sfax
² Professeur, Président de l'Université de Sfax pour le Sud, Laboratoire d'Hydrogéologie-Géothermie, Ecole Nationale d'Ingénieurs de Sfax

Abstract

Numerous examples of artificial lake creation are known throughout the world. The sebkha of Moknine is a coastal depression situated in the south east of Moknine region (Tunisia sahel). With its geographic position close to the Mediterranean sea and to the Tunisia sahel tourist zone and with a depth of -10 m below the sea level, this sebkha constitute a privileged site for on artificial lake construction. The numerical modelling of the coupled mass and water transfer with the HST3D code through the projected lake and the surrounding aquifers have permitted to define the impact of this project realisation on the ground water quality. A marine water intrusion risk in the phreatic aquifers through the projected lake was confirmed by numerical simulations.