Two-Dimensional Bed Variation Models Under Non-equilibrium Conditions in Turbulent Streams

Abstract

In this paper, a depth-averaged two-dimensional non-equilibrium coupled model has been proposed to determine water surface profiles and bed profiles in alluvial channels and rivers. In this coupled model, a hydrodynamic component was applied to the two-dimensional shallow-water equations to determine hydraulic data. By employing precalculated data, morphodynamic component could determine bed deformation in erodible layer. Moreover, in order to simulate the nature of sediment transport mechanisms more realistic, two turbulence models were used for examining the turbulence parameters. In order to achieve the successful representation of the domain by the meshes, the finite volume method was used to discretize the governing equations in explicit conditions. Furthermore, the unstructured triangular mesh system was developed to solve governing equations by total variation diminishing scheme. In the final step, due to the lack of experimental data to examine the numerical results of proposed model, Flow3D software was employed. The suggested model satisfactorily predicted water surface profiles and bed profiles simulated with Flow3D software.