1959~2021年长江中游龙坪河段新洲汊道河道演变分析  

Evolution analysis of Xinzhou Channel in Longping River Section of middle reaches of Yangtze River from 1959 to 2021

作　　者：瞿兰兰 陈亚健 王力 QU Lanlan;CHEN Yajian;WANG Li(Middle Changjiang River Bureau of Hydrology and Water Resources Survey,Bureau of Hydrology of Changjiang Water Resources Commission,Wuhan 430014,China)

机构地区：[1]长江水利委员会水文局、长江中游水文水资源勘测局,湖北武汉430014

出　　处：《水利水电快报》2024年第11期44-47,55,共5页Express Water Resources & Hydropower Information

摘　　要：长江中游龙坪河段下段属于典型的鹅头型分汊河道,为了掌握该河段近期演变规律,重点分析了1959~2021年河段新洲汊道深泓、洲滩、重要断面及分流比的变化。结果表明:三峡水库蓄水后,该河段上游水沙情形及边界状况未发生重大改变,新洲汊道仍将保持现有左支右主的河势;新洲汊道左、右汊分流比逐渐趋于稳定,仅在一定范围内上下浮动。研究结果可为长江中游河道的防洪安全、河道综合整治、水资源配置以及治河工程规划提供参考。The lower section of Longping River in the middle reaches of Yangtze River is a typical goose head type bifurcated river channel.To understand the recent evolution of this river section,we analyzed the deep channel,sandbar,important section and diversion ratio of Xinzhou Channel in the reach from 1959 to 2021.The results showed that after the impoundment of Three Gorges Reservoir,the flow and sediment conditions and boundary conditions in the upstream of the river reach had not changed significantly,and Xinzhou Channel can maintain the existing partten with right branch as mainstream and left branch as tributary.The diversion ratio of the left and right branches of Xinzhou Channel gradually stabilized,showing an fluctuations within a certain range.The research results can provide a reference for flood control safety,comprehensive river improvement,water resource allocation,and river control engineering planning of the middle reaches of Yangtze River.

关 键 词：河道演变 深泓 分流比 新洲汊道 长江中游 

分 类 号：TV143[水利工程—水力学及河流动力学]