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Mesh reworking

Par ecola — Dernière modification 31/03/2014 17:21
Mesh reworking description

FES2012 mesh has been built from the FES2004 mesh by increasing mostly ocean and shelf resolution, and more sparsely reworking shorelines description and resolution.

FES2012resolution2.png

FES2012 mesh resolution

However, the mesh reworking was limited by available computer power and mesh resolution was not adequate in many  places to accurately model ocean tides.This constraint was eased in FES2014 project, and a new bunch of regional improvements is underway.

Shorelines reworking:

  • norwegian seas
  • Baltic Sea (?)
  • yellow Sea

Major ocean/shelf resolution reworking:

  • Gulf of Mexico
  • Indonesian Seas
  • ...

    FES201486resolution2.png

    FES2014-v86 mesh resolution

     

    In addition, a new algorithm has been developed to control the maximum element size in a global ocean mesh.

    FES2014resolution2.png

    FES2014-v86 + maxsize control mesh resolution

    Discretisation is responsible for a wavelength error. It can be seen as a phase error, the following plots show the relative error of the tidal wavenumber. A 10.e-03 error in wavenumber relative error is responsible for a O(1 degree) error in phase after 1 wavelength.

     

     

    Relative wavenumber error (left) and related phase error per wavelength (right), diurnal frequencies

     

    Relative wavenumber error (left) and related phase error per wavelength (right), semi-diurnal frequencies

     

    Relative wavenumber error (left) and related phase error per wavelength (right), quater-diurnal frequencies

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