A Coupled Sediment Transport Model for Flow over Movable Bed
- Authors
- Rehman, Khawar; Lee, Ja-Hoon; Cho, He-Rin; Cho, Yong Sik
- Issue Date
- Oct-2014
- Publisher
- ICHE
- Keywords
- Sediment transport; Dam-break; Finite volume method; Coupled model; Approximate Riemann Solvers
- Citation
- Proceedings of the 11th International Conference on Hydro-Science and Engineering, pp.659 - 663
- Indexed
- OTHER
- Journal Title
- Proceedings of the 11th International Conference on Hydro-Science and Engineering
- Start Page
- 659
- End Page
- 663
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/158822
- Abstract
- A numerical approximation for bed load sediment transport due to shallow-water flows is studied. Flows over an erodible bed are solved by assuming that the dynamics of the bed load problem is described by two mathematical models: the hydrodynamic model, represented by the depth integrated shallow-water equations, and the morphological model: Exner equation. The model solves the coupled shallow-water and Exner equations, with the interface fluxes evaluated by a Harten-Lax van Leer-Contact (HLLC) approximate Riemann solver for hydrodynamic part and HLL scheme for morphological part. The domain is discretized by triangular grid system which facilitates representing complex domains. A special treatment of the source terms by surface gradient method makes the scheme stable and physically balanced. The model employs Godunov- type finite volume algorithm, with second-order accuracy in space and time. Spatial second-order accuracy is guaranteed by employing multidimensional gradient reconstruction method; and predictor-corrector scheme is used to ensure a second-order accurate solution in time. Finally, some numerical tests are presented to verify the applicability and accuracy of the proposed numerical model.
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