potential numerical issue at the sediment water interface?

[zimmermm]

I observer an elevated turbulent diffusivity close to the sediment that depends on the time when I start the simulation.
It seems that complete mixing in winter triggers a constant mixing at the bottom of the lake that does not level off anymore.
Will provide a preview of what I mean in a personal message.

[f-baerenbold]

Thank you. Will keep this issue in mind, we should further discuss it.