All Conditions?

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All Conditions?

sami
what are the boundary & initial conditions for a river with 1 reach?
e.g. a flow hydrograph for upstream & a normal depth(in fact the slope), for downstream as the boundary conditions?
& the initial condition is just the initial flow for first station at the upstream?
Are these enough?
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Re: All Conditions?

Chris G.
Administrator
For a RAS project that only has one river/reach, you would have, at a minimum, one upstream boundary condition, and one downstream boudnary condition.  The upstream is typically a flow hydrograph, but could be flow hydrograph, stage hydrograph, or stage/flow hydrograph.  The downstream boundary condition could be stage hydrograph, flow hydrograph, stage/flow hydrograph, rating curve, or normal depth.  Typically I see either stage hydrograph or normal depth as the downstream boundary.  Sometimes a rating curve.  And yes, the initial conditions is typically the first time-step flow (from your upstream boundary flow hydrograph).

That's it.
Chris G.
@RASModel
www.therassolution.com