ROMS Boundary Condition: Clamped vs. Flather

[moghimi]

Dear All,
I am modeling a tidal inlet. Here is the information at open boundaries:
- OTPS tide file
- I generated non-tidal water surface elevation at open boundaries (zeta).
- I do not have non-tidal 2D velocities at the open boundaries (no ubar and vbar).

I wonder what would be the correct combination of CPP options.
Since I do not have velocities I was thinking instead of convectional:
#define EAST_FSCHAPMAN
#define EAST_M2FLATHER

I thought of using EAST_FSCLAMPED together with EAST_M2RADIATION passive condition to let the extra volumes go out of the domain. My set-up did not below up but obviously not doing well too.

Any suggestions or link to a useful link or document is appropriated,
Saeed.

[kate]

I would stick with the Chapman/Flather.

I would use ADD_FSOBC and ADD_M2OBC. Lacking a real M2OBC, I would use ANA_M2OBC, setting it to zero.

[nacholibre]

Have you tried M2REDUCED option?
Zafer

[moghimi]

Hi,
Thanks for the answer. Not yet.
I am trying to get the model run with what Kate proposed. Would you please explain more about what combination of CPP defs do you mean to be used for compilation?

Saeed.

[arango]

Apparently, you are using a very old version the ROMS. All the CPP for open boundary conditions were removed and replaced with logical switches in ocean.in to facilitate nesting.