Question about north-south periodic boundary conditions

Discussion of how to use ROMS on different regional and basin scale applications.

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isabelmonteiro
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Joined: Wed Feb 18, 2004 3:50 pm
Location: Instituto de Meteorologia

Question about north-south periodic boundary conditions

#1 Post by isabelmonteiro » Fri Apr 16, 2010 8:43 am

I'm running ROMS for a upwelling east coast,I would like to test north-south periodic and west open boundary conditions, can anyone tell be if I have to make any changes in the north/south boundaries bathymetry or does ROMS does this internally :?:

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kate
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Re: Question about north-south periodic boundary conditions

#2 Post by kate » Fri Apr 16, 2010 4:00 pm

You will want to match the bathymetry yourself. Also the grid spacing at the ends. Note that you can't have realistic changes to f alongshore either.

isabelmonteiro
Posts: 38
Joined: Wed Feb 18, 2004 3:50 pm
Location: Instituto de Meteorologia

Re: Question about north-south periodic boundary conditions

#3 Post by isabelmonteiro » Mon Apr 19, 2010 12:14 pm

My domain is rather small (only 6 degrees lat) so changes in "f" will not be a problem. Besides matching bathymetry and grid spacing do you no if there is an advisable cell number to do this matching. :?:

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kate
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Re: Question about north-south periodic boundary conditions

#4 Post by kate » Tue Apr 20, 2010 10:31 pm

I don't understand your question. If you mean which j number has to match, j=1 matches j=M, as j=Mm matches j=0.

The easiest thing to do is to use a simple rectangular grid with uniform spacing and a uniform f. We had an idealized periodic domain years ago in which h was a function of i only. The grid was curvilinear, but describing how I got it to match is not for the faint of heart.

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