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Water 2018, 10(5), 616; https://doi.org/10.3390/w10050616

A Non-Equilibrium Sediment Transport Model for Dam Break Flow over Moveable Bed Based on Non-Uniform Rectangular Mesh

1
School of Civil Engineering and Architecture, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China
2
School of Engineering, University of Liverpool, Liverpool L69 3GH, UK
3
Ocean College, Zhejiang University, Hangzhou 310058, China
*
Author to whom correspondence should be addressed.
Received: 30 March 2018 / Revised: 5 May 2018 / Accepted: 7 May 2018 / Published: 9 May 2018
(This article belongs to the Section Hydraulics)
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Abstract

The use of multiple-level non-uniform rectangular mesh in coupled flow and sediment transport modeling is preferred to achieve high accuracy in important region without increasing computational cost greatly. Here, a robust coupled hydrodynamic and non-equilibrium sediment transport model is developed on non-uniform rectangular mesh to simulate dam break flow over movable beds. The enhanced shallow water and sediment transport equations are adopted to consider the mass and momentum exchange between the flow phase and sediment phase. The flux at the interface is calculated by the positivity preserving central upwind scheme, which belongs to Godunov-type Riemann-problem-solver-free central schemes and is less expensive than other popular Riemann solvers while still capable of tracking wet/dry fronts accurately. The nonnegative water depth reconstruction method is used to achieve second-order accuracy in space. The model was first verified against two laboratory experiments of dam break flow over irregular fixed bed. Then the quantitative performance of the model was further investigated by comparing the computational results with measurement data of dam break flow over movable bed. The good agreements between the measurements and the numerical simulations are found for the flow depth, velocity and bed changes. View Full-Text
Keywords: dam break flow; depth-averaged models; central-upwind scheme; movable bed; non-uniform rectangular mesh; non-equilibrium sediment transport dam break flow; depth-averaged models; central-upwind scheme; movable bed; non-uniform rectangular mesh; non-equilibrium sediment transport
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wu, G.; Yang, Z.; Zhang, K.; Dong, P.; Lin, Y.-T. A Non-Equilibrium Sediment Transport Model for Dam Break Flow over Moveable Bed Based on Non-Uniform Rectangular Mesh. Water 2018, 10, 616.

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