Turbulent velocity profiles in sediment-laden flows

Junke Guo, Pierre Y. Julien

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

A theoretical analysis shows that velocity profiles in sediment-laden flows are similar to those in clear water. The modified log-wake law, which is developed for clear water by Guo, is also valid in sediment-laden flows. The analysis of the effects of sediment suspension on turbulent kinetic energy and turbulent diffusion shows that: (1) sediment suspension increases mean flow energy loss; (2) sediment suspension weakens turbulent diffusion in the vertical direction and then increases velocity gradient; and (3) sediment suspension affects velocity profile in two ways: average concentration and density gradient. The comparison with narrow-channel laboratory data confirms the theoretical analysis and shows that: (1) the modified log-wake law agrees well with experimental data for sediment-laden flows; (2) both average concentration and density gradient reduce the von Karman constant; and (3) for a given width-depth ratio, sediment concentration slightly increases the wake strength while density gradient has little effect on it. In addition, the modified log-wake law can reproduce experimental data where the maximum velocity occurs below the water surface.

Original languageEnglish (US)
Pages (from-to)11-23
Number of pages13
JournalJournal of Hydraulic Research
Volume39
Issue number1
DOIs
StatePublished - Jan 1 2001

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velocity profile
Sediments
sediment
turbulent diffusion
Water
energy flow
Kinetic energy
kinetic energy
Energy dissipation
surface water
water
analysis

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Water Science and Technology

Cite this

Turbulent velocity profiles in sediment-laden flows. / Guo, Junke; Julien, Pierre Y.

In: Journal of Hydraulic Research, Vol. 39, No. 1, 01.01.2001, p. 11-23.

Research output: Contribution to journalArticle

Guo, Junke ; Julien, Pierre Y. / Turbulent velocity profiles in sediment-laden flows. In: Journal of Hydraulic Research. 2001 ; Vol. 39, No. 1. pp. 11-23.
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