TELEMAC-MASCARET Forum: Not evolution of the bed (1/1)

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TOPIC: Not evolution of the bed

Not evolution of the bed 2 years 10 months ago #39675

o.gourgue
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Is there a possibility to turn off evolution of the bed in Gaia? I want to be able to have erosion and deposition fluxes to calculate suspended sediment transport (there is no bedload in my setup), but I want my bathymetry to remain fixed. Is that possible?

I tried with MORPHOLOGICAL FACTOR ON BED EVOLUTION = 0, but the simulation blew up, probably due to some division by 0 somewhere...

Thanks for your help!

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Not evolution of the bed 2 years 10 months ago #39676

c.coulet OFFLINE Moderator Posts: 3722 Thank you received: 1031	Hi You should have the possibility to fix the non erodible bed level at the bed level...
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Not evolution of the bed 2 years 10 months ago #39678

kopmann
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Hello,
In case of non-erodable bottom you will have no erosion fluxes because there is no material. And additionally the bottom will be changed due to sedimentation I think. But the mass balance will be OK.

If you really want to have erosion and sedimentation and a fixed bottom the mass balance can not be correct. For this case I would propose to save the initial bottom to a private array PRIVE%ADR(1)%P%R = ZF before the time loop. And in the time loop ZF = PRIVE%ADR(1)%P%R. Don't forget to set NUMBER OF PRIVATE ARRAYS =1 in the steering file.

Furthermore there is a possibility with nestor (ActionType = Reset_bottom) but Boris and I think it is much more complicated to set up and too costly to do it every time step.

Best regards,
Rebekka

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