长江河口水流运动对悬沙分布的影响  

Influence of water movement on the distribution of suspended sediment in the Yangtze estuary

作　　者：黄李冰[1] 李义天[1] 孙昭华[1] 杨云平[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《水力发电学报》2015年第1期55-62,共8页Journal of Hydroelectric Engineering

基　　金：国家973计划项目(2010CB429002)

摘　　要：由于河口地区水流的往复运动,水流结构在涨落过程中不断变化,直接制约悬沙的分布。本文应用ECOMSED模型模拟长江河口的水流、悬沙动态过程,揭示悬沙在水流运动过程中的分布变化规律。结果表明:长江河口区域悬沙浓度主要受径流与潮流作用的影响;随着径流来流量或潮差的不断增大,悬沙浓度呈增大趋势,高悬沙浓度区域外边界逐渐向外扩展,高悬沙浓度区域面积不断扩大,而增大幅度则逐渐减小;落潮过程高悬沙浓度区域范围较涨潮过程平均向外扩展0.06‰;涨潮过程高悬沙浓度区域范围存在缩退的现象。Based on the reciprocating water in the estuary, the flow structure restricts directly the distribution of suspended sediment with its changing in the process of rising and falling. By using the ECOMSED model to simulate the dynamic processes of flow and suspended sediment in the Yangtze estuary, the paper reveals the variation of the distribution of suspended sediment during the flow movement. The results show that the concentration of suspended sediment （Css） is mainly effected by the actions of runoff and tide in the Yangtze estuary. With the increasing of the discharge and the tidal range, the Css has an increasing tread, the east boundary of the high Css range is gradually expanding, and the area is also constantly expanding by the increasing amplitude generally decreasing. The average boundary of the high Css area in ebb process is 0.06‰ larger than it in rising process. The high Css area has a retreating phenomenon in the rising tidal process.

关 键 词：河流泥沙工程学 长江口 ECOMSED 高悬沙浓度区域 影响因素 

分 类 号：TV142.3[水利工程—水力学及河流动力学]