Ocean Modeling Discussion

ROMS/TOMS

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PostPosted: Fri May 08, 2009 2:49 pm 
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Joined: Tue Mar 24, 2009 3:25 pm
Posts: 4
Location: MIT/WHOI Joint Program
Hello,

I am new to ROMS and I was hoping that some other users might be willing to help me with the difficult time I'm having selecting appropriate lateral boundary conditions for an idealized ROMS model run. I'm trying to model 2D bottom boundary current flowing up a bottom of constant slope. Since the flow is 2D and the slope goes north-south, I set
#define EW_PERIODIC
in the Include/*.h file for the east-west boundary condition. However, since the topography is not periodic I cannot use the boundary condition NS_PERIODIC. I think I need open boundary conditions on the north and south boundaries because the current should be entering the domain on the northern boundary and exiting the domain on the southern boundary. cppdefs.h lists more than 20 different kinds of open boundary conditions that can be applied in ROMS, and I do not know what most of them are. I checked the past forums and the wikiROMS page, but there's not much in the way of documentation describing the various boundary conditions, so could anyone suggest which one or ones might be appropriate in my situation?

Thanks very much,
Rebecca
rwdell@mit.edu


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PostPosted: Fri May 08, 2009 3:03 pm 
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Joined: Wed Dec 31, 2003 6:16 pm
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Location: USGS, USA
take a look at some of the boundary conditions used for the TEST_CHAN, ESTUARY_TEST, etc. That may provide some guidance for OBC choices in your app.


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PostPosted: Sat May 09, 2009 2:43 am 
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Joined: Mon Mar 03, 2008 4:14 am
Posts: 78
Hi~
There is some information about the bounday conditons.Hope this is useful.
http://www.oceanwave.jp/tmp/roms_obc.tgz

viewtopic.php?f=17&t=930&p=3232&hilit=nobuhito#p3232

I have the similar problem. I am cofused with the different boundary condtions, especially the open bounday condtion options. I don't know the detail phsycial means and how to use them appropriately.

I hope somebody can tell some details about the different boundary condtion options, especially the phsycial meaning.

Thanks

leon


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PostPosted: Mon May 11, 2009 4:07 pm 
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Joined: Wed Mar 26, 2003 4:14 pm
Posts: 11
Location: DOI/MMS
Check the bibliography link on the ROMS homepage for a paper (with pdf link) on boundary conditions by Marchesiello et al. This paper also has references to many other helpful sources (Orlanski, Flather, Chapman, etc.) I recall finding the Palma & Matano papers quite helpful when first learning about BCs.


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