[MITgcm-support] Problem: Extreme Tidal Currents in the Simulation at Narrow Channels.

[Killampalli Rajesh]

Dear MITgcm community

I have added additional points to the earlier post "Extreme tidal currents
in the simulation at narrow channels".Model mesh resolution is 100 metres.
I'm attempting to resolve this issue by adjusting the bottomdragliner
coefficient, which was previously set to 0.002. When it increases to 0.006,
the model blows up and writes NaNs. For 0.005, the model may run, but the
velocities are not reduced as expected, and less variance is recognised.
Currently, the maximum channel flow was 1.25m/s; after modifying to 0.005,
it was 1.21m/s redused. and I experimented with ViscAh from 10 to 100, but
no substantial difference was seen. Can someone advise how to solve this?


Best Regards
Killampalli Rajesh

On Wed, May 8, 2024 at 6:56 PM Killampalli Rajesh <rajesh70530 at gmail.com>
wrote:

> Dear MITgcm community
>
> Thank you for your assistance; I'm modelling tidal circulation in the
> lagoon, which is connected to the coastal seas.The research region includes
> lagoon and coastal waterways. The boundary conditions include baroclinic
> tidal currents at open boundaries in data.obcs, OBEam, and OBEph only on
> the eastern border, and OBCS_Tides specified in the model. The model
> results is verified using tidal heights with the tide gauge data, however
> the tidal currents are exaggerated. In example, the model findings suggest
> extremely strong tidal currents at the mouth/channel, which contradicts
> reality.
>
> Best Regards
> Killampalli Rajesh
>
>
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