[MITgcm-support] bottom drag

[Martin Losch]

Quick answer: yes (o:

have a look at pkg/mom_common/mom_u_bottomdrag.F and the corresponding documentation:
the no/free-slip does not have anything to do with bottomDragLinear/Quadratic, it sets the boundary conditions for the vertical viscosity (Laplacian) operator. You might argue that having no-slip in the viscosity term but zero drag is inconsistent, but in the end you are free (and responsible yourself) to choose a sensible set of parameters.

Martin

On Jun 15, 2011, at 8:01 AM, Xiaoming Zhai wrote:

> Hi,
> 
> I have got a quick question. What happens if I use no-slip bottom boundary condition, but does not specify values for bottomDragLinear or bottomDragQuadratic in my data file? It seems that the default values for bottomDragLinear and bottomDragQuadratic are zero. Does this mean my bottom friction and the energy dissipation associated with that are zero?  Thanks a lot.
> 
> Best,
> Xiaoming
> 
> 
> 
> 
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