Measurements of turbulent flows downstream of a spur dike at different Froude numbers

Jiyong Lee, Yeongkyu Kim, Jun Ho Cha, Seokkoo Kang

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Abstract

The effects of the Froude numbers on turbulent flow patterns downstream of a non-submerged spur dike were investigated in a laboratory flume. Three-dimensional velocities and water depths were measured using Acoustic Doppler Velocimetry and distance sensors under three Froude number conditions (Frd = 0.31, 0.38, and 0.46). The results show that there are marginal differences in the velocity fields downstream of a spur dike due to the change of the Froude number. However, an increase of the Froude number was found to reduce cross-sectional area in the flow and to increase the strength of the jet-like flow. The jet-like flow was observed to displace the location of the maximum turbulence kinetic energy within a cross section toward the inner bank in the transverse direction.

Original languageEnglish
Pages (from-to)115-123
Number of pages9
JournalJournal of Korea Water Resources Association
Volume52
Issue number2
DOIs
StatePublished - Feb 2019
Externally publishedYes

Keywords

  • ADV
  • Open channel
  • Recirculation flow
  • Spur dike
  • Three-dimensional flow

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