Impact of phosphogyps waste in the Gulf of Gabes  <B>Impact of phosphogyps waste in the Gulf of Gabes</B><P>N. Soussi1, P. Ennet2, J. Koponen3, J. Sarkkula4, S. Ben Mustapha5, A. Ben Mammou1 and T. Kokkila3</B><I><P> 1 Faculty of Sciences, Department of Geology, Camous University, Tunis, Tunisia <BR> 2 ICSC World Laboratory, Project Land3, Erice, Italy <BR> 3 EIA Centre of Finland, Tekniikantie, Espoo, Finland <BR> 4 Ministry of Environment, NBWE, Helsinki, Finland <BR> 5 National Centre of Teledetection, Tunis, Tunisia</I><P> Abstract<P> The water current and quality model has been applied in the Gulf of Gabes, Tunisia. The objective of this study was to calculate the effect of the pollution using the currents and water quality measurements data. The EIA model has been used. The remote sensing data combined with field measurements are used to describe the actual and historical states of pollution.<P> The Gulf of Gabes acts as receptacle of the wastes of the chemical industries complex in existence for twenty years. The various factories produce enormous quantity of phosphogyps damped in the sea. Some heavy metals (Cd and Zn), compounds of phosphogyps, are used in this study as tracers to quantify the rate of sedimentation and to estimate the extension of the contaminated area.<P>