Sediment transport

[Anonymous]

Hi,
I am working on a sediment transport model for a small stream that experiences a heavy sediment load. I have 6 km worth of survey data, i.e. 83 cross-sections and Wolman counts from all those cross-sections, which have been converted into a particle size distribution curve for every cross-section. I entered all the geometric data and generated a steady flow file. How do I use these data now as an input into the sediment transport model to get an idea of spots of degradation/aggradation? What kind of time intervals do I need to run etc.?

[Chris G.]

There are too many steps to include in this reply. A thorough read of the User’s Manual will help you get your sediment model set up.

[johng]

hello this is my first thread I was wondering if you could help. I have a large hecras model with 5 reaches however when I run the sediment transport no error message comes up but the computation for the sediment stop at the same cross section. how do I fix this????

[Chris G.]

I would check that cross section. Make sure the geometry and sediment data is all correct there. Can you see any output? The log output file may reveal what is going on. Perhaps you are getting an unrealistic large deposition of material at that cross section which causes the computations to halt. Hard to say. Run the data set in steady flow, without sediment, and see if it works okay. If nothing works, I suggest sending a bug report to HEC, because regardless of any input errors, the software shouldn’t abruptly halt without giving any error messages.

[Author]

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