三峡水库蓄水后长江中下游典型分汊浅滩河段演变趋势预测  

Fluvial Process Change of the Typical Multi-Branched Meandering Reach in the Mid-Down Yangtze River After Three Gorges Dam Impoundment

作　　者：张为[1] 李义天[1] 江凌[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,湖北武汉430072

出　　处：《四川大学学报（工程科学版）》2008年第4期17-24,共8页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家973资助项目(2003CB415200);国家自然科学基金资助项目(50609018);水资源与水电工程科学国家重点实验室开放研究基金(2007C016)

摘　　要：汊道兴衰、洲滩的演变与其水沙输移特性密切相关。以沙市典型分汊浅滩河段为例,从河段水沙输移特性出发,结合水流泥沙、河道地形等实测资料,分析其河床演变特点,并根据三峡建库后水沙条件变化的特点利用数学模型预测了该河段的汊道和洲滩发展趋势。研究表明:所建模型能够准确地模拟该河段的水沙输移特性及洲滩的演变规律,因而具有较好的预测功能,三峡水库蓄水后河段洲滩动态变化结果与实测结果较吻合,这对三峡水库蓄水运用后其它分汊浅滩河段的研究具有借鉴意义。The rise and decline of braided reach and the fluvial process of continent and shoal are closely related to the characteristics of hydraulic and sediment transport.The paper focuses on the Shashi reach,a typical multi-branched meandering reach in the middle Yangtze River.Firstly,based on a large amount of field data,the evolution feature of this reach is analyzed in natural condition.Then,according to the effect of Three Gorge Project(TGP) on flow and sediment process,the trend of geomorphology change is pr...

关 键 词：三峡 分汊 浅滩 河床演变 数值模拟 

分 类 号：TV147[水利工程—水力学及河流动力学]