I have run a steady flow analysis for a river in 1d mode. The river has numerous small drops and hydraulic jumps. At the cross sections and flow profile of the analysis i can see the change of the water surface line due to the drops and jumps.
I now want to produce a floodplain map. I created the terrain from the cross sections and i added the depth layer based on the terrain in Ras mapper.
As i see at the floodplain map the water depth doesn't include the transitions due to the jumps. Can i somehow show these in my floodplain results?
I am sorry that i could not gave you the answr of your question because i am new to the hecras.
I write here becasue i see that you created a terrain from 1D geometry that you have. I also tried to create the terrain out of the 1D geometry but i couldnot get the terrain in a good shape. RAS Maapper has the option to get the terrain and its seems easy too but i dont know why i am not getting the terrain that i want ? if you have the ans to this please help me . Thanks
its not like the terrain . I tried to use that terrain to run 2d simulation and the flow after simulation is like overland flow . I did the same procedure as you have mentioned but i coudnot figure what could be the mistake .
i choose 0.5 ft cell size for the terrain . its not even like a terrain . for 2d i use 0.5 ft too. i dont know whats wrong but it is giving me a lot of problem . seems easy but dont know where i made the mistake. could you provide me an example that you did to create a terran ?
I did. The depths and WSE values were the same and I have a pretty good jump in the channel. However at the outlet of a bridge and near levees the cross sections look different than the mapper. Even the XYZ is different and I was wondering myself which one is more accurate. It matters when you're checking flood plains for developments.
Do you have any structures or levees? I am going to put the levee as a lateral structure and see if it solves the problem. If you find an answer I really want to know... hope that helped a little though..
I 'm having both inaccurate WSE and Depth values at floodplain map in many cross sections even at those where there are no drops or abrupt transitions. I don't have any structures or levees. I have designed the channel with some lids and even the sediment basin is simulated with detailed cross sections. The weird thing is that the terrain i created from the cross sections seems pretty accurate. Comparing the results with the floodplain mapping, the cross sections seem more reasonable.