Distribution Properties of Velocity in Rectangular Open Channel and Flow Measurement Method

Through the flume experimental research,the velocity distribution formula for rectangular open channel have been found,including parabola form of velocity distribution on the vertical and power form of mean velocity distribution on the transverse direction,meanwhile,the means of ascertaining correlative coefficient have been given.Validation of the observing velocity data in real channels indicates that the velocity-distribution law given is in accordance with the real velocity-distribution perfectly in open channel;and the relative error between observing value and calculating value of point velocity is small,which can satisfy the precision requirement in the calculation of velocity distribution and discharge in open channel.The distributions properties of velocity have been found provided a theory to measure flow quickly and exactly.