Assessing the hydrological impacts of agricultural changes upstream of the Tunisian World Heritage sea-connected Ichkeul Lake
- 1University Carthage –Institut National Agronomique de Tunisie, 43 Av. Charles Nicole, Cité Mahrajène, 1082 Tunis, Tunisia
- 2Center for Water Research and Technologies, Borj Cedria Ecopark, PO Box 273 Soliman 8020, Tunisia
- 3Agrocampus Ouest, INRA, UMR1069, Soil Agro and hydroSystem, F-35000 Rennes, France
Keywords: Land-use change; Joumine basin; SWAT model; nitrates; spatial analysis; remote sensing
Abstract. The impact of changes in agricultural land use and practices as a controlling driver of hydrologic response and as a source of diffuse pollution, are studied in the Joumine River basin, discharging into the Ichkeul Lake, northern Tunisia, a UNESCO World Heritage site since 1979. The lake is characterized by a very specific hydrological functioning based on a seasonal alternation of water levels and salinity through its link to the Mediterranean Sea. Three Landsat images, in situ surveys and SWAT modelling were used to simulate and assess streamflows and nitrate loads under retrospective land uses.