Numerical simulation of bedload sediment transport with the ability to model wet/dry interfaces using an augmented Riemann solver

Mina Bazargan, Hossein Mahdizadeh, Soroosh Sharifi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
105 Downloads (Pure)

Abstract

This paper presents an efficient second-order finite volume method for the simulation of bedload sediment transport which is capable of modeling wet/dry fronts. The governing equations comprise the shallow water equations (SWEs) for the hydrodynamic phase and the Exner equation for the estimation of bedload sediment transport. These sets of equations are then solved using a weakly coupled scheme based on an augmented Riemann solver (WCAR). In this approach, first, the morphodynamic equation is solved, and then, updated bedload changes with the same Riemann structures are used as a source term within the SWEs. The Smart formula is utilized to estimate the bedload sediment discharge within the Exner equation. The proposed numerical model is first used to model a parabolic sediment layer. Then, a bedload hump propagation with an initial subcritical condition is considered. Next, the simulation of dam break flow over a mobile bed is investigated. Finally, the dam failure due to over-topping is studied and the computed results are compared with available experimental data. Numerical results indicate that the introduced weakly coupled method, developed based upon the augmented Riemann solver, can be effectively used for modeling all investigated flow regimes, including dry-state interfaces.
Original languageEnglish
Pages (from-to)834-850
Number of pages17
JournalJournal of Hydroinformatics
Volume21
Issue number5
Early online date3 Jul 2019
DOIs
Publication statusPublished - 1 Sep 2019

Keywords

  • Augmented Riemann solver
  • Bedload sediment transport
  • Godunov-type wave propagation algorithm
  • Weakly coupled method

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Water Science and Technology
  • Geotechnical Engineering and Engineering Geology
  • Atmospheric Science

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