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General Description of coastal hydrodynamic model PowerPoint Presentation
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General Description of coastal hydrodynamic model

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  1. General Description of coastal hydrodynamic model

  2. Waves WAVEWATCH III l -> k-l, k-e Characteristic of a coastal Hydrodymic model Bathymetry Tide Wind Mesoscale circulation WRF Currents Turbulence Sediment transport Mud Model Sand Model

  3. Equations

  4. Numerical Formulation

  5. Necessity of the data and measurements A coastal model must represent the reality as soon as possible. It’s link to the other objectives developed on the study area. From the different point of view we need: Define the forcing Collecting existing data Initiate a strategy of measurement

  6. Bathymetry

  7. Example of strategy of measurement Meteorological stations Tide recorders Currentmeter moorings CTD profiling Doppler profiling Wavemeter

  8. Tide analysis from tidegauge Amplitude in m. Phase in degree

  9. Tide analysis from classical currentmeters Amplitude in m.

  10. Wind measurement and analysis of the frequencies

  11. ADCP currents meters

  12. Drifters

  13. Definition of the grids

  14. Model Definition grid 540 (435x175)

  15. Model Definition grid 180 (200x180)

  16. Phase of Validation

  17. Validation Tide sea surface elevation

  18. Validation sea surface elevation

  19. Validation Total currents

  20. Validation Total currents

  21. Drifter comparison

  22. Drifter : velocity comparison

  23. Examples of results

  24. 1. Current evolution

  25. 2. Residence times Lagrangian Tracors

  26. 2. Residence times e-flushing time Method: concentration of one tracer Case : trade wind de 8 m/s + marée Evolution of the concentration in 1 point(example) Simulation without tide

  27. 2. Residence times Jouon, Douillet, Ouillon & Fraunié, 2006, Continental Shelf Research, 26, 1395-1415

  28. 3. Dissolved transport Tide Bottom

  29. 3. Dissolved transport Tide Surface

  30. 3. Dissolved transport Trade W Bottom

  31. 3. Dissolved transport Tide Bottom

  32. 4. Particle Dynamics C : Suspended Sediment Concentration of a given grain size / population u, v, w : water velocity provided by the hydrodynamic model Kh : horizontal diffusivity Kz : vertical diffusivity from kinematic turbulent viscosity Mathematical model General equation of suspended particle transport In Open boundary conditions Out Surface boundary conditions

  33. 4. Particle Dynamics cd, ce : critical shear stresses for deposition and erosion ke : erosion rate coefficient Mathematical model : cohesive particles (Mud) Fall velocity (Ds < 100 m) : Stokes’ formula where Bottom boundary condition Deposition (Krone, 1962) Erosion (Parthéniades, 1965) where  : shear stress provided by hydrodynamic modelling cd, ce : critical shear stresses for deposition and erosion ke : erosion rate coefficient

  34. 4. Particle Dynamics Ex: Dumbea Bay Application to the southwest lagoon of New Caledonia : Particle Diameter 3 coarse kinds of sea bottom (Chardy et al., 1988)

  35. 4. Particle Dynamics Application to the southwest lagoon of New Caledonia: Calibration Estimate of a global critical shear stress under tide + trade wind forcings averaged % of mud