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Dear all,

I am confuse about the equilibrium and nonequilibrium sediment transport?

For example, I think all the nature river could treat as equilibrium sediment transport. But for the case of Pier scour, we had to think as nonequilibrium case.


But for the river or canal with some non erosion areas, should I treat it as equilibrium case or nonequilibrium ?

regards,

Harry

Dear Harry,
Most common sediment transport models adopt the assumption of local instantaneous equilibrium for bedload transport. That means the bedload transport rate = transport capacity under an equilibrium condition.
However, in some cases sediment cannot reach new equilibrium and in this case, non-equilibrium sediment transport formulations may be needed.

According to your problem, I'd say you can solve it with classical bedload formulations as implemented in Sisyphe. For a given hydrodynamics field, your problem will certainly reach an equilibrium condition.

Anyway, you can later investigate the applicability of non-equilibrium formulations. Please let us know if you implemented some non-equilibrium formulations, as this subject is also of interest for us.


Kind regards,

Pablo