u/-atkins_

Hello everybody.

After running a model for the first time I got some results. Now changed my mesh with more breaklines and refinement regions, and also the cell size. The simulation is still running as I am writing this, but I am already asking myself:

• How can I validate the mesh that I created?
• What can I do to compare different meshes? What result should I look to?
• Does HEC RAS have some results for 2D flow simulations that can help us to see if its making sense?

Hey everybody.

I am modeling a Dam Break cascade model in HEC RAS. Is it better to model the reservoir as a storage area, or if I can keep as a 2D flow area?

For both dams, I have a DEM with great resolution (0.5m), so I thought that it wouldn't be a problem to let as 2D flow area. Also, I am not sure which one is better regarding model stability.

Both dams are flood control dams.

Hey guys, I am working with a 2D Dam break model for my university thesis. I am also new at HEC RAS, so I am not sure if I am doing this right until now.

As you can see in the picture, I have an enbankment DAM, which has a trapezoidal longitudinal cross section. If I am modeling a dam break, I am supposing that I have to do the geometry in the right way, but HEC RAS 2D Flow conn just let me do a line, which ios basically a retangular longitudinal corss section (a big waal in the river).

I tried to create my dam in the terrain editor, and I did it, but when I configurate the breching of the structure, the elevation of my breach becmos lower than the terrain (which now its the dam). So I don't know how to proceed form here.

Of cours, I was thinking if I don't necesseraly need to do the geometry as it is because maybe the result its gonna be the same as if I had just a vertical wall, but I really don't know.

I would appreciate a lot if somebody could help me.

Thanks in advance

https://preview.redd.it/q378ohzm9pzg1.png?width=1536&format=png&auto=webp&s=4e0d9f6517e52dab0929ce4e3f11bc264f80d8ae

https://preview.redd.it/0ish0u8v9pzg1.png?width=883&format=png&auto=webp&s=bae0402e0bb8a8c043f054cbd80ff6a55b8f65a4