Effect of planned marina on Enfidha groundwater (Tunisia) A local-scale groundwater modeling

The coastal Enfidha plain is located in the centre-east of Tunisia. A marina is planned downstream the plain and is likely to induce a risk on groundwater. A large scale modeling has been developed and used to evaluate the effect of the marina on the totality of the aquifer. Flow and solute transport models were built. In order to have results with higher precision, a local-scale modeling is developed by refining the mesh nearby the marina region. The submodel is calibrated over the period 1972-2005. Simulations are carried out for a 50-years period, to assess the impact details of the planned marina on groundwater quality. Results show an additional salinity increase reaching 10 g/l by the year 2055 around the planned marina. Affected areas are located mostly in the marshes regions.