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中文摘要：
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。
英文摘要：
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.
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