Grain-scale nonequilibrium sediment-transport model for unsteady flow

Shiyan Zhang, Guohong Duan, Theodor S. Strelkoff

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

A one-dimensional (1D) finite-volume model is developed for simulating nonequilibrium sediment transport in unsteady flow. The governing equations are the 1D mass and momentum conservation equations for sediment-laden flow and the sediment continuity equation for both bed load and suspended-load transport. The Rouse profile is modified to consider the nonequilibrium transport of suspended sediment. The spatial lag between the instantaneous flow properties (e.g., velocity, bed shear stress) and the rate of bed load transport in unsteady flow is quantified by using an adaptation length, which is derived theoretically by applying the momentum principle in the bed load layer. This new method for calculating the adaptation length is verified using data from several experiments and yields better results than other empirical formulas for a wide range of shear stress. The nonequilibrium model is applied to simulate a series of laboratory dam-break flows over erodible beds, and the simulated results agree well with the experimental measurements.

Original languageEnglish (US)
Pages (from-to)22-36
Number of pages15
JournalJournal of Hydraulic Engineering
Volume139
Issue number1
DOIs
StatePublished - Jan 2013

Fingerprint

Sediment transport
unsteady flow
Unsteady flow
bedload
sediment transport
Shear stress
Momentum
Sediments
Suspended sediments
shear stress
momentum
Dams
Loads (forces)
Conservation
suspended load
bottom stress
suspended sediment
sediment
dam
Experiments

Keywords

  • Adaptation length
  • Bed load layer
  • Dam-break flow over erodible beds
  • Finite-volume method
  • Nonequilibrium transport

ASJC Scopus subject areas

  • Water Science and Technology
  • Civil and Structural Engineering
  • Mechanical Engineering

Cite this

Grain-scale nonequilibrium sediment-transport model for unsteady flow. / Zhang, Shiyan; Duan, Guohong; Strelkoff, Theodor S.

In: Journal of Hydraulic Engineering, Vol. 139, No. 1, 01.2013, p. 22-36.

Research output: Contribution to journalArticle

Zhang, Shiyan ; Duan, Guohong ; Strelkoff, Theodor S. / Grain-scale nonequilibrium sediment-transport model for unsteady flow. In: Journal of Hydraulic Engineering. 2013 ; Vol. 139, No. 1. pp. 22-36.
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