Abstract

An explorative study has been carried out within the scope of this paper in order to validate a morphodynamic numerical model with the assessment of model sensitivity to some factors and parameters. The flow model component is a vertical two-dimensional with non-hydrostatic, unsteady free surface flow condition. The flow model has been coupled with sediment transport models. Two different sediment transport approach have been used, namely Ashida and Michiue’s bedload transport formula and a stochastic pick up deposition formulation proposed by Nakagawa and Tsujimoto. The model performance has been tasted for different turbulence closures, namely a zero-equation, a standard k-ε and a nonlinear k-ε models, in the context of morphodynamic simulation. Likewise, model performance has been evaluated for the prediction of temporal variation of flow-depth and boundary shear stress induced by bedform evolution based on experimental measurements.

Keywords: Morphodynamic model, turbulence model, river bedforms, sediment transport