Modelling sediment transport with hysteresis effects

Modelling sediment transport with hysteresis effects.
Knaapen, M.and Kelly, D.M.
In: XVIIIth TELEMAC-MASCARET User Conference, 19-21 October 2011, Paris, France. (Submitted) (2011)

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Abstract:This paper details the extension of the sediment transport and morphology model SISYPHE 2D to include a lag term within the bed exchange source term of the, depthaveraged, continuity of sediment concentration equation. This lag term represents the time it takes for a sediment concentration profile to adapt to spatial or temporal changes in the flow. The inclusion of a lag term means that the settling velocity is no longer the only scaling factor for the exchange of sediment between the water and the bed. The newly modified SISYPHE 2D is tested against field data from the Thames estuary (UK), flume experiments on a dredged trench and a hypothetical channel widening. It is illustrated that the lag factor introduced into SISYPHE 2D is essential to model the sediment transport and morphodynamics, especially when considering engineered situations, where the bed is out of equilibrium with the flow conditions. Moreover, with this lag factor included, there is evidence that SISYPHE 2D can be used for (short term)morphodynamic modeling of engineered situations.
Item Type:Conference or Workshop Item (Paper)
Subjects:Maritime > General
Coasts > Sediment transport and scour
Coasts > General
ID Code:542
Deposited On:31 Jan 2012 15:22
Last Modified:21 Jul 2017 09:57

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