Study on dam-break flows over mobile beds using a 1D coupled approach

Ren Kai Jhong*, Keh Chia Yeh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents a numerical model for computing dam-break flow over the movable bed. The hydrodynamic model adopts the generalized shallow water equations, which consider the effect of sediment transport and bed change on the flow. The sediment model computes the non-equilibrium transport of bed load and suspended. The sediment capacity determines by some empirical formulas. The physical mechanism of these empirical formulas can approximate to the phenomenon of dam-break flow over movable beds. The numerical method used in this paper is based on WENO method. By using the aforesaid method, the numerical model has not only a good performance on capturing the propagation of discontinuities, but also has well-balanced characteristic, which preserves mass conservation or decreases the non-conservative effects. The three dam-break experimental cases in the mobile-bed condition were simulated. The simulation results were similar to the previous researches. It indicates the numerical model is reliable. Finally, the interaction of water and sediment in dam-break field were investigated by the numerical model.

Original languageEnglish
Pages (from-to)265-272
Number of pages8
JournalJournal of the Chinese Institute of Civil and Hydraulic Engineering
Volume25
Issue number4
DOIs
StatePublished - 1 Jan 2013

Keywords

  • Dam break flow
  • Non-equilibrium sediment transport
  • Weight essentially non-oscillatory method (WENO)

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