Mean flow and turbulence around a laboratory spur dike

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44 Scopus citations

Abstract

The three-dimensional turbulent flow field around a spur dike in a plane fixed-bed laboratory open channel was studied experimentally using a microacoustic Doppler velocimeter. Mean and turbulence characteristics in all three spatial directions were evaluated at upstream and downstream cross sections near the dike. Results showed that the primary flow separated in both lateral and vertical directions. Two counter-rotating flow circulations, consisting of the lateral and vertical velocity components, originated at the dike section. Downstream of the dike, the circulation in the flow-separation zone is stronger than the one in the contracted primary flow zone. The maximum bed-shear stresses estimated using Reynolds stresses is about three times as large as the mean bed-shear stress of incoming flow.

Original languageEnglish (US)
Pages (from-to)803-811
Number of pages9
JournalJournal of Hydraulic Engineering
Volume135
Issue number10
DOIs
StatePublished - Oct 2 2009

Keywords

  • Acoustic techniques
  • Dikes
  • Flumes
  • Laboratory tests
  • Sediment transport
  • Turbulent flow
  • Velocity

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Water Science and Technology
  • Mechanical Engineering

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