Page History

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Lake or shallow coastal waters are treated as a further HTESSEL tile within a grid box with its influence proportional to the coverage of water.

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Shallow coastal waters are difficult for the oceanic models (NEMO) to analyse or forecast.  Heat, moisture and momentum fluxes are evaluated according to the proportion of the area of the grid box that is covered by open water.  Where there is:

• more than 50% sea water cover then fluxes are dealt with by NEMO.
• more than 50% water cover, but the bodies of water are classed as lakes, then the HTESSEL 'tile' is "lakes and coastal waters" and fluxes are evaluated by FLakeby FLake.
• less than 50% water cover, any sea is classed as a lake and the HTESSEL 'tile' is "lakes and coastal waters" and fluxes are evaluated by FLake by FLake (as if it were a salty water lake).

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