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Definition of the grids

Definition of the grids. Model Definition grid 540 (435x175). Model Definition grid 180 (200x180). Phase of Validation. Validation Tide sea surface elevation. Validation sea surface elevation. Validation Total currents. Validation Total currents. Drifter comparison.

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Definition of the grids

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  1. Definition of the grids

  2. Model Definition grid 540 (435x175)

  3. Model Definition grid 180 (200x180)

  4. Phase of Validation

  5. Validation Tide sea surface elevation

  6. Validation sea surface elevation

  7. Validation Total currents

  8. Validation Total currents

  9. Drifter comparison

  10. Drifter : velocity comparison

  11. Examples of results

  12. 1. Current evolution

  13. 2. Residence times Lagrangian Tracors

  14. 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

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

  16. 3. Dissolved transport Tide Bottom

  17. 3. Dissolved transport Tide Surface

  18. 3. Dissolved transport Trade W Bottom

  19. 3. Dissolved transport Tide Bottom

  20. 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

  21. 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

  22. 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)

  23. 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

  24. 4. Particle Dynamics Example : Deposition after one tidal cycle SIMULATION Tide + Trade wind 8 m/s Percentage of mud Reference : Douillet, Ouillon & Cordier, 2001, Coral Reefs, 20, 361-372

  25. 4. Particle Dynamics

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