长江下游芜裕河段近期演变规律及其影响因素分析  

Recent Evolutionary Process and Influencing Factors inWuhu-Yuxi Reach of Lower Yangtze River

作　　者：渠庚[1,2] 孙天印 何子灿[1,2] 栾华龙 郝婕妤 QU Geng;SUN Tian-yin;HE Zi-can;LUAN Hua-long;HAO Jie-yu(River Research Department,Changjiang River Scientific Research Institute,Wuhan 430010,China;Key Laboratory of River and Lake Regulation and Flood Control in the Middle and Lower Reaches of the Changjiang River of Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]长江科学院河流研究所,武汉430010 [2]长江科学院水利部长江中下游河湖治理与防洪重点实验,武汉430010 [3]河海大学水利水电学院,南京210098

出　　处：《长江科学院院报》2025年第4期10-18,共9页Journal of Changjiang River Scientific Research Institute

基　　金：长江水科学研究联合基金项目(U2240224,U2240206);中央级公益性院所长基金项目(CKSF2023328/HL,CKSF2023343/HL);湖北省自然科学基金项目(2021CFB146)。

摘　　要：芜裕河段位于长江下游,是连接长三角城市群的重要纽带。三峡水库蓄水运行后该河段河床冲刷剧烈,洲滩格局相应调整,研究新水沙条件下芜裕河段的河势演变规律,对长江下游河段的保护与治理具有重要的理论和实践意义。基于芜裕河段多年实测数据,分析了三峡工程蓄水前后该河段河道演变的基本规律,并对其影响因素进行了探讨分析。结果表明:近期芜裕河段河势总体稳定,河床以冲刷为主,洲滩头部冲刷后退,急弯段和多汊段分别出现“凸冲凹淤”和“短支汊发展”的新特征;上游潜洲右汊发展、分流量增大以及中枯水历时增加导致的主流撇弯是急弯段“凸冲凹淤”的主要原因;“短支汊发展”的驱动因素则可归因于陈家洲多汊段左汊分流比增加,进而加剧陈捷水道、曹捷水道两短汊道冲刷。The Wuhu-Yuxi reach,one of the vital links between cities in the Yangtze River Delta urban area,is located in the lower reaches of Yangtze River.Understanding the evolution of the Wuhu-Yuxi reach under new hydro-sedimentary conditions provides theoretical support for future flood control and river regulation.Observed field data for the Wuhu-Yuxi reach was analyzed to understand the altered flow-sediment regime and erosion-deposition features after the operation of the Three Gorges Reservoir(TGR).Results reveal that the Wuhu-Yuxi reach has remained generally stable.The riverbed is mainly subject to scouring,with the heads of sandbars eroded and retreating.Erosion on convex banks and deposition on concave banks have emerged in the sharp-bend section and the multi-braided section due to the development of the right sub-branch of upstream Qianzhou bar upstream which leads to an increased diversion ratio,and the mainstream chute cutoff resulted from the prolonged duration of medium-low water levels.Short sub-branches have also developed in the multi-braided section because the diversion ratio of the left sub-branch in the multi-braided section of Chenjiazhou bar has increased,which in turn intensifies the scouring of the Chenjie and Caojie waterways.

关 键 词：河床演变 凸冲凹淤 短支汊发展 因素分析 三峡水库运行 分流比 长江下游河段 芜裕河段 

分 类 号：TV147[水利工程—水力学及河流动力学]