Water Science and Engineering 2017, 10(4) 287-294 DOI:   https://doi.org/10.1016/j.wse.2017.12.006  ISSN: 1674-2370 CN: 32-1785/TV

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Keywords
Shallow water
Sediment transport
Bed load flux model
Depth-averaged concentration flux model
Dam break
Authors
PubMed

Comparison of depth-averaged concentration and bed load flux sediment transport models of dam-break flow

Jia-heng Zhao a,*, Ilhan Özgen a, Dong-fang Liang b, Reinhard Hinkelmann a

a Department of Civil Engineering, Technische Universität Berlin, Berlin 13355, Germany
b Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, UK

Abstract

This paper presents numerical simulations of dam-break flow over a movable bed. Two different mathematical models were compared: a fully coupled formulation of shallow water equations with erosion and deposition terms (a depth-averaged concentration flux model), and shallow water equations with a fully coupled Exner equation (a bed load flux model). Both models were discretized using the cell-centered finite volume method, and a second-order Godunov-type scheme was used to solve the equations. The numerical flux was calculated using a Harten, Lax, and van Leer approximate Riemann solver with the contact wave restored (HLLC). A novel slope source term treatment that considers the density change was introduced to the depth-averaged concentration flux model to obtain higher-order accuracy. A source term that accounts for the sediment flux was added to the bed load flux model to reflect the influence of sediment movement on the momentum of the water. In a one-dimensional test case, a sensitivity study on different model parameters was carried out. For the depth-averaged concentration flux model, Manning’s coefficient and sediment porosity values showed an almost linear relationship with the bottom change, and for the bed load flux model, the sediment porosity was identified as the most sensitive parameter. The capabilities and limitations of both model concepts are demonstrated in a benchmark experimental test case dealing with dam-break flow over variable bed topography.

Keywords Shallow water   Sediment transport   Bed load flux model   Depth-averaged concentration flux model   Dam break  
Received 2017-04-26 Revised 2017-08-31 Online: 2017-10-30 
DOI: https://doi.org/10.1016/j.wse.2017.12.006
Fund:

This work was supported by the China Scholarship Council.

Corresponding Authors: jiaheng.zhao@wahyd.tu-berlin.de (Jia-heng Zhao)
Email: jiaheng.zhao@wahyd.tu-berlin.de
About author:

References:

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