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Istanbul 5 th March 2010

MedGOOS Half-day Seminar 2010. Istanbul 5 th March 2010 Efficient downscaling to coastal sea using the unstructured finite volume model MIKE 3 – applications in the Ligurian Sea and for Danish Belts Jacob V Tornfeldt Sørensen, DHI. Recent Experiences.

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Istanbul 5 th March 2010

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  1. MedGOOS Half-day Seminar 2010 Istanbul 5th March 2010 Efficient downscaling to coastal sea using the unstructured finite volume model MIKE 3 – applications in the Ligurian Sea and for Danish Belts Jacob V Tornfeldt Sørensen, DHI

  2. Recent Experiences Ligurian coastal sea 3D model (in colaboration with INGV) User : Agenzia Regionale per la Protezione dell'Ambiente Ligure (ARPAL) • Step I : • Bathing water analysis • Scenario modelling (LIP) • Step II : • Operational forecasting

  3. Recent Experiences Ligurian coastal sea 3D model • Model forcing : • MFS boundaries of T, S, u, v and surface elevation • Tides and inverse barometer effect imposed at the open boundaries • Atmospheric forcing from BOLAM

  4. Recent Experiences Fehmarnbelt Fixed Link 500 km

  5. Recent Experiences Denmark • The largest fixed link in Europe • 20 km • Bridge or tunnel • 4.4 - 5.1 billion EUR • Danish-German agreement September 2008 • Excepted opening in 2018 Germany

  6. Recent Experiences

  7. Environmental Concern, (Permanent Effects) • Blocking • Water Exchange of the Baltic Sea • Ecology of the Baltic sensitive to salinity • Cod Fishery Darss Bothnian Bay Baltic Sea StolpeChannel Bothnian Sea Gotland Deep

  8. Environmental Concern, (Temporary Effects) • Dredging Spill • Shading of Macro Algae • Impact on Mussels • Fish Migration • Birds • Marine Mammals

  9. Downscaling Key Issues • Boundary conditions • Internal Downscaling • Consistancy calibration of coarse model data

  10. Downscaling Key Issues • Boundary conditions • Regional basin and mesoscale circulation • Tidal elevation and inverse barometer effects • Numerical implementation (e.g. Flather, interpolation constraint)

  11. Downscaling MIKE 21 model setup DHI Gulf of Mexico model Mercator Ocean mesoscale model

  12. Downscaling Key Issues • Internal Downscaling • Numerical method allowing gradual increase in resolution (e.g. flexible mesh finite volume) • Resolution and bathymetry prererably consistent to coarse model at and near open boundary • Include model features of importance for local scale modelling (e.g. mass conserving F/D, structures, wave current interaction and process modules)

  13. Resolusion ~ 500m Downscaling Ligurian coastal sea 3D model MIKE 3 HD FM • Bathymetry consistency • Consistent resolution • Smooth downscaling

  14. Downscaling Increased flow resistance and increased mixing

  15. Downscaling Combination of: - Field measurements - Physical model experiments - Detailed CFD analysis Parameterisation of flow resistance and mixing CFD will supplement and extend the data from the physical model experiments

  16. Local high resolution oceanographic MIKE 3 FM model

  17. Downscaling additions

  18. Downscaling additions

  19. Conclusion and next steps • Skillful regional scale models exists • Basic downscaling technology and methodology exist • Every case still needs careful analysis and hard work • Streamline approach via user interface • Advance local scale data assimilation • Further improvement of boundary condition formulation • Improved computational performance

  20. Thank you for your attentionFurther information:jts@dhigroup.com

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