1. WP03: ANALYTICAL TOOLS, MODELS TELEMAC MODELLING PROGRESS WP03: ANALATICOL TOOLS, MODELS

2. PLAN Characteristics of the studied area Water quality issues Data description Model construction Scenarios simulated Results discussion construction of the second model WP03: ANALATICOL TOOLS, MODELS

3. have no The coastline of Hammamet contains 12 little oueds draining small watersheds which have no influence on hydrodynamism of Gulf Hammamet (N-S) This region is sheltered from the general Mediterranian currents (N-S) thanks to the Cap Bon “peninsula”. The tide in the gulf of Hammamet is semi-diurnal and has slight amplitude (20 cm). it has no influence on hydrodynamism the most important factor that affects the hydrodynamism in the region is the wind Characteristics of the studied area WP03: ANALATICOL TOOLS, MODELS

4. Water quality issues Our case study simulates the impact of a recycled water discharge (from the station STEP3 ) on the swimming water quality through an off-shore emissary. So, we do monitor the dispersion plume of COD and BOD coming from the emissary that is 1600 m far from the coast and laying at –23m depth. The objective of this stady is to know how polluants are disperced in the gulf of Hammamet ( plume extend, affected zones); Even if the rejections are conform to national standards this exercice will allow us to implement an early warning system and action plan in the case of break down of treatment station or over flow; Sustainable management of STEP3 can be released from this study. We note that Hammamet is a very important region for the seaside tourism. In such context we must be vigilant and able to face any possibility of marine contamination. WP03: ANALATICOL TOOLS, MODELS

5. Bathymetry extracted from topographic map (1/25000) Data descriptions WP03: ANALATICOL TOOLS, MODELS DEM generated by MATISS and plotted with RUBENS

6. Data descriptions WP03: ANALATICOL TOOLS, MODELS

7. Data description

8. Data descriptions

9. WP03: ANALATICOL TOOLS, MODELS Model construction 19804 meshes 10090 nodes

10. Modelling domain Boundary condition Solid limit (2222) Boundary condition imposed Level (5445): 0 m Two kinds of boundary conditions Model construction WP03: ANALATICOL TOOLS, MODELS

11. Global circulation S-N Global circulation N-S WP03: ANALATICOL TOOLS, MODELS 315°(20 m/s) 90°(26 m/s) Scenarios simulated TELEMAC2D

12. WP03: ANALATICOL TOOLS, MODELS Scenarios simulated SUBIEF2D

13. The hydrodynamic model needs more accurate data and adjustement to restitute faithfully the reality We did revew input data and parameters: Acquisition of detailed wind series data Acquisition of detailed wind series data Acquisition of more pricise bathymetric data Acquisition of more pricise bathymetric data Model extend Model extend Conception of new meshes Conception of new meshes Reconsideration of the boundary conditions Reconsideration of the boundary conditions Acquisition of boundary conditions value (velocity) fram a model implemented overall tunisian coastal line ( INSTM research group) Acquisition of boundary conditions value (velocity) fram a model implemented overall tunisian coastal line ( INSTM research group) Results discussion Construction of new model WP03: ANALATICOL TOOLS, MODELS

14. Construction of the second model Integration of more detailed bathymetry and new modelling domaine bathymetry plotted on RUBENS

15. WP03: ANALATICOL TOOLS, MODELS elements Number : 15106 15106 Number of nodes : 7874 7874 Length Length max : 1461m 1461m min : 1m 1m parametres Meshe parametres Construction of the second model

16. WP03: ANALATICOL TOOLS, MODELS Construction of the second model

17. WP03: ANALATICOL TOOLS, MODELS Boundary conditions Solid limite boundary Imposed velocity liquide boundary Construction of the second model