| 过渡区动床明渠流的流速分布 |
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| 引用本文： | 刘春晶,李丹勋,曲兆松,王兴奎.过渡区动床明渠流的流速分布[J].水科学进展,2006,17(1):49-54. |
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| 作者姓名： | 刘春晶 李丹勋 曲兆松 王兴奎 |
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| 作者单位： | 清华大学水沙科学教育部重点实验室, 北京, 100084 |
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| 摘 要： | 利用激光流速仪测量了随水流强度加大松散床面,从定床到具有一定输沙强度的动床流动,试验水流条件均处于过渡区。试验资料分析表明,动床过渡区明渠流的卡门常数小于通常所采用的0.4;水流强度逐渐增大,随着推移质运动量增加,阻力系数有减小再增大的趋势;雷诺应力分布和紊动强度分布规律同光滑明渠流类似。
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| 关 键 词： | 明渠流 过渡粗糙区 动床 推移质 流速分布 |
| 文章编号： | 1001-6791（2006）01-0049-06 |
| 收稿时间： | 2004-07-23 |
| 修稿时间： | 2004-10-30 |
Velocity profile of open-channel flows in the transitional roughness region on mobile beds |
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| 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. |
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| Authors: | LIU Chun-jing LI Dan-xun QU Zhao-song WANG Xing-kui |
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| Affiliation: | Key Laboratory of Water & Sediment Sciences of Ministry of Education, Tsinghua University, Beijing 100084, China |
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| Abstract: | 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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| Keywords: | open-channel flow transitional roughness mobile bed bed load velocity profile |
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