航道挖槽紊动特性试验研究

挖槽是河道治理的重要工程措施之一。以长江上游神背嘴右槽为原型进行挖槽概化模型设计，采用三维超声流速仪，系统地测量不同挖槽断面下水流紊动特性，并对时均流速、紊动强度等沿垂线分布进行分析计算，同时还对挖槽水流纵向、横向及垂向的紊动强度分布特点进行了比较。试验结果表明，在一定数值范围内，窄深型断面底部应力和紊动强度相对较大，在减少航槽回淤方面优于宽浅型断面。

Experimental Study on Turbulence Characteristics of Flow in Dredge-cut

Channel dredging is one of the important measures in river regulation.Based on the right channel of Shenbeizui reach in the Yangtze River,turbulence characteristics of flow in different dredge-cut were studied in generalized model with a 3-D MicroADV system.The distributions of time-averaged velocities,turbulent intensities along depth were further analyzed and calculated.In addition,the distribution characters of longitudinal,lateral and vertical turbulent intensities were compared.It was found that within a certain scope the bottom stress and turbulence of narrow-deep pattern were larger,so it was better than the broad-shallow one in aspect of reducing sediment back silting.