Modelling morphodynamics in the presence of immobile sediment : model testing and sensitivity analysis

For a better management of the river system, Rijkswaterstaat is interested in improving the tools available for predicting morphodynamic changes. As such, an attention point is prediction of the formation and break-up of coarse layers. A new modelling concept (the HANNEKE model) was devised that is capable of better capturing the transport of fine sediment over a coarse layer as well as break-up and entrainment of coarse sediment under high-flow conditions. Prior to its general application it is necessary to gain knowledge and understanding of its features. In this project, the new modelling concept is applied to a laboratory experiment to evaluate the capacity of the model against detailed measurements. Subsequently, the model is applied to idealized cases in which the effect of the model parameters is studied in detail. Finally, implications for field cases are derived.