Hello,
I have two questions about the Upstream boundary condition in FaSTMECH. The first Question is if it is possible to have two points of discharge entrance, I want to simulate the confluence of two streams. The second question is if it is possible to set a sediment load in entrance discharge, or is any way to introduce sediments.
Thank you so much for your answers.
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Fastmech can handle more than one discharge input only when the two (or more) discharge can be crossed by a single upstream cross-section.Note that the cross-section need not cross perpendicularly to the channel, but you’ll need to set upstream flow conditions carefully (with appropriate angles). If the channels cannot be crossed by a single cross-section, then you should use a different model, such as Nay2dh or River2d. Fastmech assumes equilibrium load for sediment at the upstream end, but you can alter this by a multiplicative factor using the variable “Fraction of Equilibrium Load” to underload or overload the channel.
Upstream boundary conditions are required at the upstream end of all reaches that are not connected to other reaches or storage areas. An upstream boundary condition is applied as a flow hydrograph of discharge versus time.
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