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《Advances in Water Science》 2006-01
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Velocity profile of open-channel flows in the transitional roughness region on mobile beds

LIU Chun-jing,LI Dan-xun,QU Zhao-song,WANG Xing-kui(Key Laboratory of Water & Sediment Sciences of Ministry of Education,Tsinghua University,Beijing 100084,China)  
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 2-D 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.
【Fund】: 国家自然科学基金资助项目(50279013 50221903)~~
【CateGory Index】: TV133
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