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Main Title: Comparison of depth-averaged concentration and bed load flux sediment transport models of dam-break flow
Author(s): Zhao, Jiaheng
Özgen, Ilhan
Liang, Dongfang
Hinkelmann, Reinhard
Type: Article
Language Code: en
Is Part Of: 10.14279/depositonce-8380
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.
Issue Date: 2017
Date Available: 29-Apr-2019
DDC Class: 627 Wasserbau
Subject(s): shallow water
sediment transport
bed load flux model
depth-averaged concentration flux model
dam break
Journal Title: Water Science and Engineering
Publisher: Elsevier
Publisher Place: Amsterdam
Volume: 10
Issue: 4
Publisher DOI: 10.1016/j.wse.2017.12.006
Page Start: 287
Page End: 294
EISSN: 1674-2370
Appears in Collections:FG Wasserwirtschaft und Hydrosystemmodellierung » Publications

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