wake velocity
1.In this paper,some characteristics of flow movement and sediment transport are analyzed by using the flume experiment data.The cross section of compound channel can be divided into four regions:the undisturbed region in main channel,the interactive region between channel and plain,the undisturbed region in flood plain and the boundary region.In the undisturbed regions,the distribution of longitudinal velocity along the depth has the feature of lograithmic.Whereas,in the interactive region,the longitudinal velocity does not obey the logarithmic distribution law,but it can expressed as a revised logarithmic function by using a wake function.On the basis of the kinematic equation the velocity distribution of transverse velocity is obtained.In the boundary region,the longitudinal velocity obeys the law of parabolic distribution.Furthermore,according to the simplified diffusion equation,the transverse distribution of sediment concentration in the interactive region is deduced.The analysis is in good agreement with the measured data.
