Can someone tell me some details about open boundary options

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leon
Posts: 78
Joined: Mon Mar 03, 2008 4:14 am

Can someone tell me some details about open boundary options

#1 Unread post by leon »

Dear all,
In the cppdef.h of ROMS, we can see some open boundary condtion options. For example:

Code: Select all

** Eastern edge open boundary condtions OPTIONS:                             **
**                                                                           **
** EAST_FSCHAPMAN      use if free-surface Chapman condition                 **
** EAST_FSGRADIENT     use if free-surface gradient condition                **
** EAST_FSRADIATION    use if free-surface radiation condition               **
** EAST_FSNUDGING      use if free-surface passive/active nudging term       **
** EAST_FSCLAMPED      use if free-surface clamped condition                 **
** EAST_M2FLATHER      use if 2D momentum Flather condition                  **
** EAST_M2GRADIENT     use if 2D momentum gradient condition                 **
** EAST_M2RADIATION    use if 2D momentum radiation condition                **
** EAST_M2REDUCED      use if 2D momentum reduced-physics                    **
** EAST_M2NUDGING      use if 2D momentum passive/active nudging term        **
** EAST_M2CLAMPED      use if 2D momentum clamped condition                  **
** EAST_M3GRADIENT     use if 3D momentum gradient condition                 **
** EAST_M3RADIATION    use if 3D momentum radiation condition                **
** EAST_M3NUDGING      use if 3D momentum passive/active nudging term        **
** EAST_M3CLAMPED      use if 3D momentum clamped condition                  **
** EAST_KGRADIENT      use if TKE fields gradient condition                  **
** EAST_KRADIATION     use if TKE fields radiation condition                 **
** EAST_TGRADIENT      use if tracers gradient condition                     **
** EAST_TRADIATION     use if tracers radiation condition                    **
** EAST_TNUDGING       use if tracers passive/active nudging term            **
** EAST_TCLAMPED       use if tracers clamped condition                      **

Many people are confused about the options of different open boundary condtion. I have the same problem. Can someone tell me some details about the different options? For example, what is Flather condtion? Radiation condtion? etc...How should we choose different condtions at different situations?

Any information is OK. Thank you ~

leon

andreykoch

Re: Can someone tell me some details about open boundary options

#2 Unread post by andreykoch »

There is a nice report on OBC by Nobuhito Mori, you can find it here: http://www.oceanwave.jp/tmp/roms_obc.tgz

Also, check the discussion:
viewtopic.php?f=17&t=930&p=3232&hilit=nobuhito#p3232

leon
Posts: 78
Joined: Mon Mar 03, 2008 4:14 am

Re: Can someone tell me some details about open boundary options

#3 Unread post by leon »

First, thank you very much. I have the roms_obc.pdf already. It just said some codes of the obc. But I still don't know the details mean of the obc options. I mean the physical means. Anyone can tell me that? Thanks~

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