The interaction of oscillating-grid turbulence with a sediment layer

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This study described a preliminary experimental setup to identify how near-bed turbulence interacts with and moves sediment. The turbulence generated by a vertically oscillating grid was made to interact with a homogeneous horizontal sediment layer. Near-spherical particles were used throughout with two types of sediment at comparable sediment size d≈700 μm. The interaction characteristics were investigated by employing the PIV technique to measure the velocity field f the displaced sediment grains (within the transverse plane of the bed surface) during the interaction. Measurement of the velocity of the displaced sediment grains was restricted to the 1 case, where is the Shields parameter, the subscript denotes critical i.e. threshold criteria, τb is the mean bed shear stress and s relative density of sediment. During the period of interaction, the sediment grains were primarily displaced by the r dial velocities and formed distinctive circular trajectories. Energetic turbulence resuspends the particles above the bed surface, forming the characteristics particle splash.

Original languageEnglish
Pages (from-to)598-608
Number of pages11
JournalResearch Journal of Applied Sciences, Engineering and Technology
Volume6
Issue number4
Publication statusPublished - 2013

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Sediments
Turbulence
Shear stress
Trajectories

Keywords

  • Sediment trajectories turbulence-particle interaction
  • Zero-mean turbulence

ASJC Scopus subject areas

  • Engineering(all)
  • Computer Science(all)

Cite this

The interaction of oscillating-grid turbulence with a sediment layer. / Wan Mohtar, Wan Hanna Melini; Zakaria, N. M.

In: Research Journal of Applied Sciences, Engineering and Technology, Vol. 6, No. 4, 2013, p. 598-608.

Research output: Contribution to journalArticle

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