[MITgcm-support] SSH drift and obcs again

[Martin Losch]

Hi Tom,

no final ideas, but do you think you can reproduce your problem based 
on exp4 in the current code (four open boundary conditions with 
topography in the middle of the domain)? If so, could you send me the 
code modifications that are necessary for this? This would let me try a 
few things myself (not that I think that I will come up with something 
spectacular, but as I wrote earlier, I should probably look into that 
problem for my application).

Martin

Martin
On Oct 30, 2005, at 6:05 PM, Thomas Haine wrote:

> Hi Martin, That's a great idea but, confusingly, it doesn't fix the
> issue. If I correct over a fraction of the southern wall excluding the
> corners it works to machine precision with land corner points, but 
> fails
> with ocean corner points. This has me baffled.
>
> Alistair's good suggestion about computing transport excluding corners
> also doesn't work even with land at the corners.
>
> Any final ideas?  I'm ready to stick land in at the corners and run it
> (and/or explore other domains without obcs).
>
> Thanks for your help, Tom.
>
>
> On Thu, 2005-10-27 at 09:23 +0200, Martin Losch wrote:
>> Hi Tom,
>> my guess is, that you need to satisfy BOTH of the following:
>> 1. you need you corner points to have consistent u and v velocities, 
>> so
>> that they do not introduce vertical velocitites due to horizontal
>> divergences.
>> 2. At the same time you need your total flow to balance
>> Have you tried this:
>> After specifying consistent velocities at the corners, compute the
>> total balance without changing the corner velocities, that is, you 
>> take
>> these points into account, when you compute the imbalance, but when 
>> you
>> compute average boundary velocity corrections, you don't take into
>> account the area occupied by the corner points and you don't correct
>> the corner points.
>>
>> I wonder if this can be included in the code in general way ...
>>
>> Martin
>
>
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