Modeling study of free overfall in a rectangular channel with strip roughness

Yakun Guo, L. X. Zhang, Y. M. Shen, J. S. Zhang

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Results from combined laboratory experimental and turbulent numerical modeling studies are presented to investigate the effects of bed roughness (discrete square strips) and slope on the flow over a free overfall in a rectangular channel. A broad range of model parameters such as the bed roughness, channel slope, and incoming upstream Froude number is investigated. The water surface profiles upstream of the brink of the channel, the velocity fields in cavity between two strips, and end depth (water depth at the brink of the channel) are simulated, measured, and discussed for various input conditions. The results show that for a given dimension of bed roughness the relative spacing of roughness (defined as the ratio of the center to center distance to the height of the strip) has a significant effect on the flow. The computational results are in good agreement with the experimental measurements.

Original languageEnglish
Pages (from-to)664-667
Number of pages4
JournalJournal of Hydraulic Engineering
Volume134
Issue number5
DOIs
Publication statusPublished - May 2008

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bed roughness
roughness
Surface roughness
modeling
Froude number
Water
water depth
cavity
spacing
surface water
effect

Keywords

  • inviscid flow
  • waterfall

Cite this

Modeling study of free overfall in a rectangular channel with strip roughness. / Guo, Yakun; Zhang, L. X.; Shen, Y. M.; Zhang, J. S.

In: Journal of Hydraulic Engineering, Vol. 134, No. 5, 05.2008, p. 664-667.

Research output: Contribution to journalArticle

Guo, Yakun ; Zhang, L. X. ; Shen, Y. M. ; Zhang, J. S. / Modeling study of free overfall in a rectangular channel with strip roughness. In: Journal of Hydraulic Engineering. 2008 ; Vol. 134, No. 5. pp. 664-667.
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