User Forum of Software BASEMENT

chri_and

User

Registered: 2017-07-27

Posts: 34

Sediment pilling up with gate type open

Hello

In my 2D sumulation with Basement 2.8 I'm using a inner_boundary of type gate. The inner_boundary under Hydrology looks like this:

            INNER_BOUNDARY {
                type         = gate
                string_name1 = gate_in
                string_name2 = gate_out
                file         = gateLevel.txt
            }

where string_name1 = gate_in is the upstream section of the gate and  string_name2 = gate_out the downstream one, the gateLevel.txt contains the constant level of the gate.

The inner_boundary under Morphology looks like this:

                INNER_BOUNDARY {
                    type         = open
                    string_name1 = gate_in
                    string_name2 = gate_out
                }

With this setup I get no sediment transport through the gate, instead the material pilles up behind the upstream cross section of the gate. What I'm doing wrong? How can I ensure sediment transport through the gate with the above setup? Is there a bug in Basement 2.8?

Regards

snapshot

Last edited by chri_and (2019-08-06 06:54:08)

Stephan Kammerer

Developer

Registered: 2015-03-31

Posts: 67

Re: Sediment pilling up with gate type open

Like it is written in the help funktion of the INNER BOUNDARY block, there is no sediment continuity through the inner boundary:

"(...)If inner boundaries and sediment transport computations are combined, the problem arises that sediment masses are not transported over the inner boundary but stop in front of the innerboundary structure. This behaviour is undesired in some scenarios. A solution, allowing for sediment continuity, is the use of 'dredge sources' which can be used to let the sediments pass the inner boundary."

You can use a dredge source in order to "bypass" the sediment.

chri_and

User

Registered: 2017-07-27

Posts: 34

Re: Sediment pilling up with gate type open

Hi Stephan

Understood, thanks for the replay.

Cheers