长江中游陆溪口水道河床演变机理研究  

Research on river evolution mechanism of Luxikou Reach in Middle Yangtze River

作　　者：陈尚坡[1] 李义天[1] 朱玲玲 孙昭华[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 [2]长江委水文局,湖北武汉430010

出　　处：《泥沙研究》2013年第4期74-80,共7页Journal of Sediment Research

基　　金：国家重点基础研究发展计划(973)重大水利工程影响下河口水沙和地貌变化过程(2010CB429002)

摘　　要：陆溪口河段是长江典型鹅头型汊道,滩槽演变复杂,是长江中游重点浅滩碍航河段。本文深入分析了河段的上下游河势关系以及影响因子之间的耦合作用,认为可以将河道平面内的主流带位置作为影响河床演变的综合动力因子,并利用特征流量的概念对主流带位置进行了定量描述。在利用特征流量揭示河床演变机理的同时,得到了"来流过程与特征流量的相对关系决定河床演变的冲淤性质,特征流量级持续作用时间长短与沙量的大小共同决定河床演变的幅度"的重要结论,得到了"三峡水库蓄水改变下游水沙过程,使河段航道发展条件优于蓄水前"的结论,并给出了具体依据。The Luxikou Reach is a typical goose-head braided channel in the Middle Yangtze River and is frequently in bad navigation condition because of its complicated evolution.The relationship between the channels from upstream to downstream,and the interaction of the impact factors of river evolution are analyzed.The location of mainstream in the plane can be considered as the comprehensive power factor,which can be given a quantitative description with the concept of characteristic flow.When the mechanism of river evolution is revealed by using the characteristic flow,an important conclusion is drawn as follows.Whether erosion or deposition,the change of riverbed is determinated by the relationship between the coming flow process and the characteristic flow,while its amplitude is determinated by the duration of the characteristic flow and the sediment load.And the navigation condition in this waterway after the impoundment of the Three Gorges Reservoir is going to be better than before,the reason is given at last,viewed from the change of flow process.

关 键 词：鹅头分汊水道 河床演变 河势 主流摆动 特征流量 航道整治 

分 类 号：TV147[水利工程—水力学及河流动力学]