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WP03: ANALYTICAL TOOLS, MODELS

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

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WP03: ANALYTICAL TOOLS, MODELS

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  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 • Scenariossimulated • Results discussion • construction of the second model WP03: ANALATICOL TOOLS, MODELS

  3. Characteristics of the studied area • The coastline of Hammamet contains 12 little oueds draining small watersheds which have no influence on hydrodynamism of Gulf Hammamet • 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 WP03: ANALATICOL TOOLS, MODELS

  4. Water quality issues 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. • 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. WP03: ANALATICOL TOOLS, MODELS

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

  6. Data descriptions WP03: ANALATICOL TOOLS, MODELS

  7. Data description

  8. Data descriptions

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

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

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

  12. Scenarios simulated SUBIEF2D WP03: ANALATICOL TOOLS, MODELS

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

  14. Construction of the second model • Integration of more detailed bathymetry and new modelling domaine • bathymetry plotted on RUBENS WP03: ANALATICOL TOOLS, MODELS

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

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

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

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