Two-dimensional depth-averaged model simulation of suspended sediment concentration distribution in a groyne field

Jennifer G. Duan, S. K. Nanda

Research output: Contribution to journalArticle

53 Scopus citations

Abstract

River-training structures, such as spur dikes, are effective engineered methods used to protect banks and improve aquatic habitat. This paper reports the development and application of a two-dimensional depth-averaged hydrodynamic model to simulate suspended sediment concentration distribution in a groyne field. The governing equations of flow hydrodynamic model are depth-averaged two-dimensional Reynold's averaged momentum equations and continuity equation in which the density of sediment laden-flow varies with the concentration of suspended sediment. The depth-averaged two-dimensional convection and diffusion equation was solved to obtain the depth-averaged suspended sediment concentration. The source term is the difference between suspended sediment entrainment and deposition from bed surface. One laboratory experiment was chosen to verify the simulated flow field around a groyne, and the other to verify the suspended sediment concentration distribution in a meandering channel. Then, the model utility was demonstrated in a field case study focusing on the confluence of the Kankakee and Iroquois Rivers in Illinois, United States, to simulate the distribution of suspended sediment concentration around spur dikes. Results demonstrated that the depth-averaged, two-dimensional model can approximately simulate the flow hydrodynamic field and concentration of suspended sediment. Spur dikes can be used to effectively relocate suspended sediment in alluvial channels.

Original languageEnglish (US)
Pages (from-to)426-437
Number of pages12
JournalJournal of Hydrology
Volume327
Issue number3-4
DOIs
StatePublished - Aug 20 2006
Externally publishedYes

Keywords

  • Hydraulic engineering
  • Numerical modeling
  • River confluence
  • River management
  • Sediment transport

ASJC Scopus subject areas

  • Water Science and Technology

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