Can anyone suggest me about unsteady flow analysis of River using HEC-RAS 4.10. I tried to read the manual given by US army crop and also tried to refer on Samples examples given by US army crop.
I am looking for inputs parameter required for detailed analysis in unsteady flow with HEC-RAS tool or any other model/method available?
HEC-RAS could be a god tool for steady/unsteady flow analysis, sediment transport, water quality assessment as well. To run HEC-RAS, the river geometry (cross sections, manning n), boundary conditions of these analyses are compulsorily required.
You have to be careful on setting of Boundary conditions. Basically BC in upstream is a discharge (river flow) and BC in downstream end is water level. Those data must be a time series if you perform unsteady analysis.
HEC-RAS is a good tool for unsteady flow analysis. It should be noted that RAS is a one dimensional model and if you need exact modeling, you may use other software like Flow-3D.
In order to do unsteady flow analysis with any software, you need to know about the boundary conditions, geometry of the river and initial condition.
I think the link below can answer many questions and problems in HECRAS and its solution.
http://hecrasmodel.blogspot.com/
Be careful about the locating the main channel in cross section on HEC-RAS.
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