[MITgcm-support] Orlanski vs sponge obcs in ocean modelling

[Dimitris Menemenlis]

I think that Orlanski is for barotropic waves only, not internal waves.

Sponge boundary condition could help with internal waves but in some 
circumstances it could make sense to let them internal waves bounce 
around at edge of your your domain.  In real world you will have 
internal waves entering your domain as well as exiting.  So the bouncing 
waves at boundary could compensate in part for you lack of internal wave 
forcing at your boundary.

On 11/15/2017 08:10 AM, Yangxin He wrote:
> Hey there,
> 
> 
> I am forcing internal waves from the west boundary, and I want no 
> reflection from the east boundary.
> 
> 1) Which boundary condition will be better for me? Orlanski or sponge?
> 
> 2) About the Orlanski BC, the original Orlanski bc, which he proposed 
> in 1976, have problems when waves approach the boundary with an angle. 
> Later in 1984, Raymond and Kuo improved the original Orlanski BC so that 
> the improved bc can account for waves from all directions.  The question 
> is, which one does MITgcm implement? the original or the improved 
> Orlanski BC?
> 
> 
> Thanks
> 
> 
> Yangxin
> 
> 
> 
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