Lateral Flow Hydrograph Inflows

[SaraA]

Hi,

Is it possible to locate in a Boundary condition of a 2D mesh a Lateral Flow Hydrograph or Uniform Lateral Inflow, or there is only the possibility to locate Flow Hydrographs?

Thank you,

Sara

[Scott Miller]

Are you asking whether it is possible to control the flow across a lateral structure?

[SaraA]

Hi,

No, this is not my question. I am adapting a 1D model with Uniform Lateral Inflows and Lateral Inflow Hydrographs extending along several cross sections into a 2D model.

In the 2D model,what I am doing is to create boundary conditions inside of the 2D mesh starting in the cross section where the inflow starts extending until the end of the cross section where this inflow uniformally distributed ends, however, in 2D the only option available is to locate flow hydrographs, neither lateral inflow hydrograhs or uniform inflows.

My solution is to include all these data as a flow hydrographs in boundary conditions in 2D that extends the same distance between the cross sections in which the lateral and uniform flows are located in 1D, as I told you, but I do not know if this is the correct way to do it.

Thank you,

Sara

[Scott Miller]

I think you would have to approximate it. Instead of creating a single internal boundary condition along the mesh cells on the bank of a reach, divide the source among cells along the bank. The inflow hydrograph can be scaled. Say, if you use the same hydrograph in 100 cells, scale the inflow by 0.01. There would be 100 boundary conditions, rather than one.

It gets further from what you are trying to do, though. I don’t expect you can have different internal boundary conditions in two adjacent cells, so the source cells would have to be separated by cells that do not have boundary conditions. Also, I expect that the internal boundary condition cells cannot share faces with a lateral structure.

Try it though, I haven’t yet. I am more familiar with external boundary conditions, where I assign a slope of the topography into the mesh, and flow enters the mesh at the lowest part of the section.

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