Modelling morphodynamic development in the presence of immobile sediment

Modelling morphodynamic development in the presence of immobile sediment

Chavarrías, Víctor (Deltares)
Ottevanger, Willem (Deltares)
Sloff, C.J. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares)
Mosselman, E. (TU Delft Rivers, Ports, Waterways and Dredging Engineering; Deltares)

2022

Predicting the formation and break-up of immobile layers is of crucial importance for river management, as these processes greatly affect the morphodynamic evolution of the river bed. Two models are currently available for studying these processes: Struiksma's and Hirano's model. In this paper, we show that both models present limitations. This is done by numerical modelling of a laboratory experiment and two thought experiments. Struiksma's model does not predict break-up and Hirano's model yields unrealistic results when part of the sediment is immobile. We propose two alternatives that overcome these limitations: the ILSE and HANNEKE models. They differ in the interpretation of the top part of the bed interacting with the flow. Moreover, only the HANNEKE model explicitly predicts the formation of coarse layers, at the expenses of a more limited application range.

Mixed-size sediment
Immobile sediment
Fixed layers
Coarse layer
Active-layer model

http://resolver.tudelft.nl/uuid:1691a239-c223-45ec-9fb1-1e26b97cf373

https://doi.org/10.1016/j.geomorph.2022.108290

2023-07-01

0169-555X

Geomorphology, 410

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2022 Víctor Chavarrías, Willem Ottevanger, C.J. Sloff, E. Mosselman