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Unrealistic sediment transport with AGRIF

I have been running CROCO model to study sedminet transport in a realistic application using wave information from SWAN. I seem to have good results.

When activating AGRIF, everything related to the water column is passing well between child's and parent grid. But there seems to be some problems with sediment bed, causing an erosion in the parent grid and accumulation in the child's grid.

Does/did someone face the same issue?

Thank you! With best regards, Marili