1 / 20

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.

ulmer
Download Presentation

Istanbul 5 th March 2010

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related