长江下荆江监利河段乌龟洲汊道分流分沙变化及演变特征分析  

Characteristic analysis of branch flow and sediment diversion of Wugui central bar in Jianli reach of Lower Jingjiang River of Yangtze River

作　　者：魏林云 李强 谢静红 WEI Linyun;LI Qiang;XIE Jinghong(Jingjiang Bureau of Hydrology and Water Resources Survey,Changjiang Water Resources Commission,Jingzhou 434000,China)

机构地区：[1]长江水利委员会水文局荆江水文水资源勘测局,湖北荆州434000

出　　处：《水利水电快报》2021年第2期24-30,共7页Express Water Resources & Hydropower Information

基　　金：国家重点研发计划项目“洞庭湖江湖联通复杂河网综合整治技术及示范”(2017YFC0405305)。

摘　　要：监利乌龟洲汊道位于长江中游下荆江河段中部,属于典型的弯曲分汊型河道。重点分析了2010~2018年长江中游下荆江河段乌龟洲汊道分流分沙及断面演变特征。结果表明:该河段断面形态基本稳定,受三峡水库清水下泄、洞庭湖洪水顶托相互影响,断面年际间变化冲淤互现;分流分沙较稳定,右汊为主汊。从上游河势变化、汊道分流分沙变化及人类活动影响等角度探讨了汊道变化的原因。研究结果可为长江中下游河道的防洪安全、河道综合整治、险工护岸和水利工程建设等提供参考。Wugui central bar in Jianli reach is located in the middle of Lower Jingjiang reach of Middle Yangtze River,which is a typical slightly curved branched channel.The variation characteristics of cross-section,branch flow and sediment diversion of Wugui central bar in Jianli reach of lower Jingjiang River from 2010 to 2018 were an⁃alyzed.The results showed that the cross-section shape was basically stable,and the inter-annual alternative scour⁃ing and silting of the cross-section was caused by the co-influence of clear water discharge of Three Gorges Reser⁃voir and the back water effect of Dongting Lake flood;the flow and sediment diversion ratio of two branches was sta⁃ble with the right branch as the main branch.The change causes of branch channel evolution is discussed in terms of the river regime change of upstream channel,the diversion ratio variation of flow and sediment and the influence of human activities.The results can provide reference for the flood control,the comprehensive regulation of river channel,the construction of bank protection and hydraulic projects etc..

关 键 词：汊道演变 分流分沙 断面特性 下荆江河段 

分 类 号：TV147[水利工程—水力学及河流动力学]