Tidal Forcing

Description of Tidal Forcing in ROMS

Tidal Forcing Files in ROMS

Once the appropriate cpp options have been set (e.g. SSH_TIDES, UV_TIDES, RAMP_TIDES), a netcdf file of tidal constituents must be generated.

1. Download the desired tidal constituent database and associated software. There are many tidal constituent databases available for download and the choice of databases depends on the desired constituents and location of the ROMS grid. Two possibilities which have broad geographic range and generally the dominant constituents are the OSU Tidal Data Inversion Software and the ADCIRC tidal database.
2. Interpolate the tidal constituent database to the desired ROMS grid.
3. Verify all open boundary grid cells contain valid data.
4. The phase of the u/ v/ zeta components of the tidal constituents should be shifted to the appropriate reference time(t=to).ocean.in
5. Convert the amplitude/phase information to tidal ellipse parameters, if necessary.
6. Export tidal ellipse parameters to a ROMS netcdf forcing file.

OSU Tidal Prediction Software Example

http://www.coas.oregonstate.edu/research/po/research/tide/

ADCIRC Tidal Database Example

http://www.unc.edu/ims/ccats/tides/tides.htm