User Forum of Software BASEMENT

huangvy

User

Registered: 2015-07-23

Posts: 24

How to generate the 1D grid for laboratory flume case over mobile bed

Hi everyone,
     I am trying to model one flume case over mobile bed. The height of vertical wall is 1.2 m. The width of the flume is 0.3 m, I used six points to define the cross sections:
( 0.000000,1.200000),( 0.000000,0.588000),( 0.000001,0.588000),( 0.299999,0.588000),( 0.300000,0.588000),( 0.300000,1.200000 ) with soil range (0.0.000001,0.299999). When I run the model with bedload transport, there is an error "sediment level exceeds the lower dike level in ..." . Is there anyone who knows how to fix this?

Kind regards,

Wei

Lukas Vonwiller

Developer

Registered: 2014-09-04

Posts: 130

Re: How to generate the 1D grid for laboratory flume case over mobile bed

Dear Wei
Try to define your cross section with only four points: (0.000000,1.200000),( 0.000001,0.588000),( 0.299999,0.588000),( 0.300000,1.200000 )
using soil range (0.000001,0.299999).
Hope this helps!
Best, Lukas

huangvy

User

Registered: 2015-07-23

Posts: 24

Re: How to generate the 1D grid for laboratory flume case over mobile bed

Dear Lucas,
    I tried your suggestion. However, it does not fix the problem. Maybe there is something missunderstanding?

Wei

Lukas Vonwiller

Developer

Registered: 2014-09-04

Posts: 130

Re: How to generate the 1D grid for laboratory flume case over mobile bed

Dear Wei
Try to find out which at which cross section you have this high deposition (maybe first one?).
It seems that either you have too much sediment at the inflow boundary or
too strong erosion somewhere in your domain and further downstream too high deposition,
e.g. try to run your simulation without sediment inflow at the upper boundary, or change grain size and start with one grain size in the beginning.

Best, Lukas