Bed Evolution under Rapidly Varying Flows by a New Method for Wave Speed Estimation
- Title
- Bed Evolution under Rapidly Varying Flows by a New Method for Wave Speed Estimation
- Author
- 조용식
- Keywords
- sediment transport process; numerical modeling; Saint Venant-Exner equations; finite volume method; dam-break
- Issue Date
- 2016-07
- Publisher
- MDPI AG
- Citation
- WATER (2016.8), v. 8, NO 5, Page. 1-20
- Abstract
- This paper proposes a sediment-transport model based on coupled Saint-Venant and Exner equations. A finite volume method of Godunov type with predictor-corrector steps is used to solve a set of coupled equations. An efficient combination of approximate Riemann solvers is proposed to compute fluxes associated with sediment-laden flow. In addition, a new method is proposed for computing the water depth and velocity values along the shear wave. This method ensures smooth solutions, even for flows with high discontinuities, and on domains with highly distorted grids. The numerical model is tested for channel aggradation on a sloping bottom, dam-break cases at flume-scale and reach-scale with flat bottom configurations and varying downstream water depths. The proposed model is tested for predicting the position of hydraulic jump, wave front propagation, and for predicting magnitude of bed erosion. The comparison between results based on the proposed scheme and analytical, experimental, and published numerical results shows good agreement. Sensitivity analysis shows that the model is computationally efficient and virtually independent of mesh refinement.
- URI
- http://www.mdpi.com/2073-4441/8/5/212https://repository.hanyang.ac.kr/handle/20.500.11754/74512
- ISSN
- 2073-4441
- DOI
- 10.3390/w8050212
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
- Files in This Item:
- Bed Evolution under Rapidly Varying Flows by a New Method for Wave Speed Estimation.pdfDownload
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