Study on vertical velocity distribution with extra fine sediment

Because the distribution of velocity with hyper-concentration does not fit logtical law, a series of experiments were conducted in an open channel. The time average velocity data were calculated by the measured time average velocity data, and compared with the results obtained from dip modified log law for the vertical profile of open channel flow. The results indicate that the time-averaged velocity profile accord with the dip modified log law. However, under different conditions of flow and sediments and boundary, the related parameters in dip modified formula are different. The study of this paper can deepen the recognition of vertical distribution in open channel flow.