open TELEMAC-MASCARET The mathematically superior suite of solvers

Hi,
I am developing an estuary model to examine the impact of proposed work on freshwater plume dispersion process in the estuary. The tide ranges between -2 m to 2 m MSL.

I have set up a model using sigma layer structure and the model works okay. I want to set up a model using z-layer structure (prescribed elevation) for comparison. I have set up zplane with a meter apart in the intertidal range.

ZPLANE%R(18)=-3.0D0
ZPLANE%R(19)=-2.0D0
ZPLANE%R(20)=-1.0D0
ZPLANE%R(21)= 0.0D0
ZPLANE%R(22)= 1.0D0
ZPLANE%R(NLAYER)= 2.0D0

For some simulations, I got the following error messages after the model simulated for 1 day of simulation time or so:

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Primary job terminated normally, but 1 process returned
a non-zero exit code.. Per user-direction, the job has been aborted.

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mpiexec detected that one or more processes exited with non-zero status, thus causing
the job to be terminated. The first process to do so was:

Process name: [[50710,1],25]
Exit code: 1

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Strange thing is that this doesn't happen all the time. When I adjusted some of the ZPLANE values, some of the simulations ran okay without encountering this crash message. If I set the ZPLANE%R(NLAYER) value to be lower than the low tide level (i.e., -3.0D0), then I don't encounter the problem. However, the model will over estimate the mixing process with the top layer having thickness of up to 5 m.

Does this problem have do with how the model was installed or just the issue with flooding and drying on the tidal flat?

thanks.

Hi
I think you can't fix the value of Zplane(Nlayer) as it should be the free surface...

For your case, I would say you could fix a reference level lower than the low tide and use a sigma layering for the upper part. This will probably help you to have a better control on the mixing process

Regards

Hi,

Thanks. Yes, I did try and relax the Zplane(Nlayer) in the code but still experienced the same error message. So that wasn't the problem.

Thanks for the suggestion. Yes, I have also implemented sigma-z_layer structure as well. I am just trying to see if I can troubleshoot and get the z-layer model to work. For now, I will probably just move on with sigma-z_layer structure.

Cheers