backkom wrote:
1.if the tidal forcing could be given in the boundary files? for example,my cases only has one south open boundary,can i impose the tidal forcing just by prescribing elevations and currents at south boundary without providing the tidal forcing file containing some harmonic constants of elevation and current.if only boundary files is possible,then i do not need the tidal forcing file,if not,why?
Yes, you can specify the southern boundary condition as a function of time and not use a tidal forcing file.
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2.some posts said that both tidal elevations and currents on the open boundary should been given for tidal forcing case,i don not sure if this is true.if so ,why not simply providing the tidal elevations with normal currents at the open boundary set to zero.
If you specify zero normal currents at the open boundary, it is not behaving like an open boundary. Tides going into an estuary will have variable elevation and currents, with maximum currents when the elevation is near zero, minimum currents at the extremes of the elevation.
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3 why the tidal forcing should be given at the whole grid?it is seems that ROMS only uses the ones along open boundary.
This I don't know. However, since ROMS isn't using the interior, you can just set them to zero.