Ocean side mesh: Eddy regime / non-eddy regime requirements

[saeed-moghimi-noaa]

No description provided.

[felicio93]

Eddying Regime

Information from Joseph's "Mesh generation for Eddying and Transitional Regime" (MSCI602) class:

• Eddying regime: weakly forced, mostly balanced (geostrophic)
  • For 3D model, the mesh transition should be gradual and smoother in eddying and transition regimes
  • Most challenging situation is where the transitional regime is very tight (e.g., steep slopes)

Why?:

• Mesh generation for eddying regime therefore should strive to preserve this balance by using gradually varying resolution
  • This is also because the bathymetric variation in the deep ocean is negligible
  • Sharp transition would distort or create spurious eddying processes (Wang and Danilov 2013)
  • Simplicity in mesh design here is a virtue: do not over-constrain the mesh unnecessarily in eddying regime
  • Use auxiliary arcs to avoid excessive resolution in deep water (hydrostatic assumption)
  • Horizontal Resolution >> Vertical Depth

The mesh should be "featureless" (do not follow the bathymetry), e.g.:

Non-Eddying Regime

• Note that:
  • The recommendation is to keep the mesh the mesh "featureless" even in areas close to sharp slope transitions (no smoothing in the deep)
  • In areas of high slopes (>45 degrees), i.e. non-eddying, take full advantage of polymorphism, irregular elements, lsc2m etc.

Result:

[felicio93]

tagging @feiye-vims in case he has any other requirement