摘要
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。
Channel dredging is one of the important measures in fiver regulation. Based on the fight 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.
出处
《水运工程》
北大核心
2007年第12期89-93,共5页
Port & Waterway Engineering
基金
西部交通建设科技项目(200532800029)
关键词
挖槽
概化模型
紊动特性
dredge-cut
generalized model
turbulence characteristics
