HEC-RAS Data Input Format (River Flow and Sediment Transport)
Greetings, everyone! :)
I am currently taking Water Resources Management for BS Civil Engineering program, and we are taught to use HEC-RAS to run river flow simulations for various river set-ups and characteristics (steady, unsteady, etc). The software is pretty much straightforward and I am having fun learning how to use all of its tools.
However, one tricky part is analyzing data inputs. Our professor gave us some clear instructions for the first few river flow problems, but I am clueless about this latest one. I assume this one is taken out of some file type that the software can read directly. Unfortunately, this is all I have and I just need to know what the symbols and numbers mean. Can someone here help me out to identify what these figures mean?
River Flow and Sediment Transport Problem with HEC-RAS
U/S Inflow: 5000, 15000, 4500 cfs for period for first 720 ,then 1440 and finally 1440 hours
D/S Water Surface: Assume uniform flow with reasonable friction slope based on Manning’s BC
For the second part, I already distinguished the FS, MS, CS, and VCS as the soil texture classifications, but I have no idea what the other numbers mean.
I'd really appreciate anyone who can guide me out here. Once I know what these values stand for, I can easily proceed with running the simulation. Thank you so much in advance, and I hope to learn more about the experts from here! :)
The 'X1' stands for cross section. So that is cross section M5.0. I don't know what the '8' is. The '100' and '145' are probably left and right channel station. The 5280 are the lengths of the overbank and the channel. The next two lines are the station/elevation data for the cross section.
Sediment Discharge Rating Curve (Qs= tons per day, Q=cfs)
[applied to both U/S of RCH1 and RCH3]
Q 100 1000 10000 100000
FS 2.75 218.75 32160 181250
MS 2.8 198.75 22160 101250
CS 2.6 78.75 10160 151250
This looks like the upstream sediment boundary. So, for instance, if the flow was '1000' cfs there would be 218.75 tons/day of Fine Sand.