LIU Chun-jing, LI Dan-xun, QU Zhao-song, WANG Xing-kui. Velocity profile of open-channel flows in the transitional roughness region on mobile beds[J]. Advances in Water Science, 2006, 17(1): 49-54.
Citation: LIU Chun-jing, LI Dan-xun, QU Zhao-song, WANG Xing-kui. Velocity profile of open-channel flows in the transitional roughness region on mobile beds[J]. Advances in Water Science, 2006, 17(1): 49-54.

Velocity profile of open-channel flows in the transitional roughness region on mobile beds

  • The experiments on open-channel flows on the rough mobile bed in the transitional region are reported in this paper. The velocity in the flume were measured by a 22D LDA,and the resistance coefficient were calculated with the Einstein's resistance division method. The experimental results show that(1)The Karman constant in the Log-law of the open channel flows in the transition region is smaller than which that of the smooth open channel flows,and the integral parameter B does not coincide well with the Nikuradse's result from the pipe flows;(2)The weak bed load in the flume may cause the drag-reducing effect;and(3)The Reynolds stress and the turbulence distribution are similar to those in the smooth open channel flows.
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