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A depth-averaged non-cohesive sediment transport model with improved discretization of flux and source terms

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Zhao, Jiaheng 
Ozgen-Xian, Ilhan 
Liang, D 
Wang, Tian 
Hinkelmann, Reinhard 

Abstract

This paper presents novel flux and source term treatments within a Godunov-type finite volume framework for predicting the depth-averaged shallow water fl ow and sediment transport with enhanced the accuracy and stability. The suspended load ratio is introduced to differentiate between the advection of the suspended load and the advection of water. A modified Harten, Lax and van Leer Riemann solver with the contact wave restored (HLLC) is derived for the fl ux calculation based on the new wave pattern involving the suspended load ratio. The source term calculation is enhanced by means of a novel splitting-point implicit discretization. The slope effect is introduced by modifying the critical shear stress, with two treatments being discussed. The numerical scheme is tested in five examples that comprise both fixed and movable beds. The model predictions show good agreement with measurement, except for cases where local three-dimensional effects dominate.

Description

Keywords

Sediment transport, Total load model, HLLC Riemann solver, Finite-volume method, Source term treatment

Journal Title

Journal of Hydrology

Conference Name

Journal ISSN

0022-1694
1879-2707

Volume Title

Publisher

Elsevier
Sponsorship
Engineering and Physical Sciences Research Council (EP/I019308/1)
Engineering and Physical Sciences Research Council (EP/K000314/1)
Engineering and Physical Sciences Research Council (EP/L010917/1)
Engineering and Physical Sciences Research Council (EP/N021614/1)
China Scholarship Council