Analysis of near-bed sediment motion

Qing Quan Liu*, Ji Fu Zhou, An Ping Shu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Based on the experimental data obtained by using two-phase measuring technique, the fluctuating features and mechanism of sediment movement near the bed in water-sediment flow were analyzed. The special mechanism of sediment movement in the near-bed layer is found in that sediment particles have very intense non-turbulent fluctuation near the bed, resulting in fluctuating stress, which will greatly influence sediment movement. From this point of view, a systematical knowledge on the physical process of sediment particles being raised in water flow is presented. Some problems and insufficiencies existing in traditional theories are discussed, from which a new basic model of sediment entrainment is suggested. Using the two-phase flow theory, the mechanism of sediment entrainment are analyzed in detail. Finally, the profile of sediment concentration are investigated by the theory of momentum equilibrium of particle movements in vertical direction. It is demonstrated that, besides the gradient of sediment concentration, the gradient of fluctuating velocity intensity of particles is also a significant diffuse force, which further gives a reasonable explanation for the mechanism of two types of profiles of sediment concentration.

Original languageEnglish
Pages (from-to)569-575
Number of pages7
JournalShuikexue Jinzhan/Advances in Water Science
Volume14
Issue number5
Publication statusPublished - Sept 2003
Externally publishedYes

Keywords

  • Bed
  • Concentration distribution
  • Diffusion
  • Particle fluctuation
  • Sediment entrainment
  • Sediment motion

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