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Upstream Boundary Conditions for Dam Break Analysis in HEC-RAS

Upstream Boundary Conditions for Dam Break Analysis in HEC-RAS

Upstream Boundary Conditions for Dam Break Analysis in HEC-RAS

(OP)
I am performing a dam break analysis using HEC-RAS (my first time with unsteady modeling in RAS). The model is unstable from the get go so I guessing my boundary/initial conditions are causing it. My upstream boundary condition is the reservoir WSEL (no inflow hydrograph into reservior). I have the dam breach occur at the start of the simulation. The downstream condition is normal depth. Has anyone performed a successful unsteady model using similar boundary conditions?

RE: Upstream Boundary Conditions for Dam Break Analysis in HEC-RAS

You might try adding some flow data prior to your breach event, say 50 to 200 cfs for a couple of minutes to give the model something to chew on while it starts.  HEC-RAS does not like large, abrupt changes in flow, nor does it like to run dry (e.g. no inflow hydrograph.  Considering the magnitude of a breach event, a small flow at the beginning will likely be inconsequential.

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