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Setting up the ESTRATUM values
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TOPIC: Setting up the ESTRATUM values

Setting up the ESTRATUM values 2 months 1 week ago #45520

  • manojkg
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I am working on a tide flow driven river system where I do not have credible information to setup the thickness of erodible boundary. Could someone from the forum point me in the right direction please?

This is a coupled TELEMAC2D, GAIA system. I am using the user_bed_init.f to specify the thickness.
  1. Run a loop from 1 to number of nodes and specify:
  2. ESTRATUM(1,IPOIN) = 10.0D0 [arbitrary value]

Adding to this, the thickness is only applied to region of the model where erosion is applied (by specifying the erodible/nonerodible flags in the .slf file.

Issue:
Within the first 2-3 hours I see that some part of the bottom is eroding to 10.0m. The velocity range during the period is between 0-1.8 m/s and the region eroding had an initial bed elevation of -18.0 m.

When I change the erodible region to the whole model domain, I do not see erosion at the same spot. Makes me question the results I observe.
Questions:
  1. Is there a systematic procedure to calibrate and set the thickness of erodible layer?
  2. Is value I am observing physically possible?
The sediment class being used is as follows:
CLASSES TYPE OF SEDIMENT    = NCO;NCO;NCO;CO;CO
CLASSES SEDIMENT DIAMETERS  = 0.002;0.0002;0.00008;0.00002;0.000002
Sediment sources
There are three fluid boundaries and sediment flux across the boundary at this point is assumed to be zero
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Setting up the ESTRATUM values

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