明渠含沙水流的垂线流速分布特性研究

 为了进一步研究明渠中含沙水流的垂线流速分布规律，在水槽系统中对明渠恒定均匀含沙水流进行了系列试验，利用实测流速资料，计算分析了时均流速的垂线分布。结果表明：在宽深比比较小的明渠中对最大流速点修正的对数公式可以很好地符合实测数据；水槽中心位置的卡门常数要比其边壁附近的小；卡门常数随着含沙量的增加而减小。通过对明渠含沙水流垂线流速分布特性的研究，增强了对明渠含沙水流垂线流速分布规律的认识。

Study on Vertical Velocity Profile with Suspended Sediment in Open Channel

In order to further study the vertical velocity profile with suspended sediment in open channel,a series of experiments are conducted in a flume.The time average velocity profiles are analyzed by the measured time average velocity data,and compared with the results obtained from modified logarithmic law for the vertical profile of open channel flow.The results indicate that the time-averaged velocity profile accords with that obtained by the modified logarithmic law,that the Karman constant K in the center of the flume is less than that near the wall of the flume,and that,however,the Karman constant decreases with the increase of sediment concentration.The study of this paper can deepen the recognition of vertical distribution in open channel flow.