Comparison of depthaveraged concentration and bed load flux sediment transport models of dambreak flow
Abstract
This paper presents numerical simulations of dambreak 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 depthaveraged concentration flux model), and shallow water equations with a fully coupled Exner equation (a bed load flux model). Both models were discretized using the cellcentered finite volume method, and a secondorder Godunovtype 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 depthaveraged concentration flux model to obtain higherorder 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 onedimensional test case, a sensitivity study on different model parameters was carried out. For the depthaveraged 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. Themore »
 Authors:

 Technische Univ. Berlin (Germany). Dept. of Civil Engineering
 Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Technische Univ. Berlin (Germany). Dept. of Civil Engineering
 Univ. of Cambridge (United Kingdom). Dept. of Engineering
 Publication Date:
 Research Org.:
 Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC)
 OSTI Identifier:
 1482523
 Grant/Contract Number:
 AC0205CH11231
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Water Science and Engineering
 Additional Journal Information:
 Journal Volume: 10; Journal Issue: 4; Journal ID: ISSN 16742370
 Publisher:
 Elsevier  Hohai University
 Country of Publication:
 United States
 Language:
 English
 Subject:
 58 GEOSCIENCES
Citation Formats
Zhao, Jiaheng, ÖzgenXian, Ilhan, Liang, Dongfang, and Hinkelmann, Reinhard. Comparison of depthaveraged concentration and bed load flux sediment transport models of dambreak flow. United States: N. p., 2017.
Web. doi:10.1016/j.wse.2017.12.006.
Zhao, Jiaheng, ÖzgenXian, Ilhan, Liang, Dongfang, & Hinkelmann, Reinhard. Comparison of depthaveraged concentration and bed load flux sediment transport models of dambreak flow. United States. doi:10.1016/j.wse.2017.12.006.
Zhao, Jiaheng, ÖzgenXian, Ilhan, Liang, Dongfang, and Hinkelmann, Reinhard. Thu .
"Comparison of depthaveraged concentration and bed load flux sediment transport models of dambreak flow". United States. doi:10.1016/j.wse.2017.12.006. https://www.osti.gov/servlets/purl/1482523.
@article{osti_1482523,
title = {Comparison of depthaveraged concentration and bed load flux sediment transport models of dambreak flow},
author = {Zhao, Jiaheng and ÖzgenXian, Ilhan and Liang, Dongfang and Hinkelmann, Reinhard},
abstractNote = {This paper presents numerical simulations of dambreak 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 depthaveraged concentration flux model), and shallow water equations with a fully coupled Exner equation (a bed load flux model). Both models were discretized using the cellcentered finite volume method, and a secondorder Godunovtype 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 depthaveraged concentration flux model to obtain higherorder 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 onedimensional test case, a sensitivity study on different model parameters was carried out. For the depthaveraged 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 dambreak flow over variable bed topography.},
doi = {10.1016/j.wse.2017.12.006},
journal = {Water Science and Engineering},
number = 4,
volume = 10,
place = {United States},
year = {2017},
month = {12}
}