非恒定流作用下输沙率变化过程研究  

Changing process of sediment transport rate under action of unsteady flow

作　　者：杨祥飞 

机构地区：[1]长江重庆航运工程勘察设计院,重庆401147

出　　处：《水运工程》2014年第7期17-22,45,共7页Port & Waterway Engineering

基　　金：西部交通建设科技项目（2009328746042）

摘　　要：通航河流修建水利枢纽后，调峰发电下泄类似“人造洪峰”的非恒定流和含沙量趋近于零的清水，破坏了河流的平衡，给河床演变、航道整治技术等带来新的课题。通过水槽试验、理论分析等手段，研究枢纽下游非恒定流作用下均匀沙的起动与输移规律。研究认为：非恒定流作用下输沙率变化过程与水流条件具有不同步性，并与水流非恒定强度P有关，当P〉0．32时，水流参数峰值一般先于输沙率峰值；当P〈0．32时，水流参数峰值滞后于输沙率峰值。After construction of water conservancy in the navigable river, the discharge of the unsteady water flow which is similar to the man-made flood peak and clear water of near to zero sediment concentration from the peaking power generation destroys the balance of the river, and thus brings a new topics for research on bed evolution and waterway regulation technology. Based on the flume experiment and theory analysis, we study the starting and transport rule of uniform sediment under the action of unsteady flow in the hub＇s downstream. The result reveals that changing process of sediment rate under unsteady flow and flow condition are not synchronized, and it relates to the intensity of the unsteady flow P. When P is larger than 0. 32, the sediment peak generally lags behind the rate of flow parameters of the peak; when P is less than 0. 32, the sediment discharge peak may occur before the peak flow parameters.

关 键 词：航道整治 非恒定流 输沙率 

分 类 号：U617[交通运输工程—船舶及航道工程]