Development of a Two-Dimensional Hybrid Sediment-Transport Model

This paper presents the development of a two-dimensional hydrodynamic sediment transport model using finite volume method based on collocated unstructured hybrid-mesh system consisting triangular and quadrilateral cells. The is single-phase nonequilibrium sediment-transport for nonuniform noncohesive sediments in unsteady turbulent flows that considers multiple processes such as deposition, erosion, transport, bed sorting. features hybrid mesh easy generation complex domains. To avoid interpolation from vertices conventional models, this adopted second-order accurate edge-gradient evaluation to consider irregularities Taylor’s series expansion. In addition, multipoint momentum corrections were integrated possible nonphysical oscillations during wetting-and-drying process, common problems, ensure both numerical stability accuracy. developed was validated by benchmark degradation case erosion process with armoring effects, aggradation deposition naturally meandering river long-term processes. Finally, successfully applied simulate reservoir significantly affected typhoon events.