A turbulence model of wave-induced sheet flow

Tai Wen Hsu*, Hsien-Kuo Chang, Chih Min Hsieh

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

This paper presents a turbulence model that describes the sediment concentration and turbulent boundary layer of a wave-induced sheet flow. The simultaneous interactions between oscillatory, turbulent flow, and suspended sediment are included. The model specifies the equivalent roughness as a function of the Shields parameter, which is variable with time and is more physically realistic over a mobile flat bed. A wave friction factor, which differs from the conventional rough wall law, is obtained from the velocity gradient. A comparison of the turbulent boundary layer and sediment concentration for different equivalent roughness is given. The present model is shown to provide more accurate estimates than those using an equivalent roughness. Numerical results also show that the presence of suspended sediment retards mean velocity profile and decrease corresponding turbulence dynamic quantities.

Original languageEnglish
Pages (from-to)12-23
Number of pages12
JournalJournal of Coastal Research
Volume19
Issue number1
StatePublished - 1 Dec 2003

Keywords

  • Shields number
  • Turbulence model sheet flow
  • Wave friction factor

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