三峡工程运用后水沙变化对世业洲汊道河床演变的影响  

Influence of change of water and sediment on river evolution in Shiyezhou branch channel of the Yangtze River after application of Three Gorges project

作　　者：许慧[1] 张健 张伟露[3] XU Hui;ZHANG Jian;ZHANG Wei-lu(Key Laboratory of Port,Waterway and Sedimentation Engineering of the Ministry of Transport,Nanjing Hydraulic Research Institute,Nanjing 210029,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Nanjing R&D Tech Service Co.,Ltd.,Nanjing 210029,China)

机构地区：[1]南京水利科学研究院,港口航道泥沙工程交通行业重点实验室,江苏南京210029 [2]河海大学水利水电学院,江苏南京210098 [3]南京瑞迪科技服务有限公司,江苏南京210029

出　　处：《水运工程》2021年第7期94-99,共6页Port & Waterway Engineering

基　　金：国家重点研发计划项目(2017YFC0405206)。

摘　　要：长江南京以下河段以分汊河型为主,受径流和潮汐的共同作用,水沙运动及河床冲淤复杂。以南京以下12.5 m深水航道重点碍航浅滩之一的仪征水道为例,在已有研究成果的基础上,根据近期实测水文泥沙和地形资料,分析三峡水库蓄水前后仪征水道演变特性,探讨三峡枢纽运行后水沙变化对河床冲淤的影响。结果表明:三峡水库蓄水后,仪征水道河床冲淤与蓄水前有所不同。蓄水前世业洲左汊冲刷、右汊微淤,蓄水后左右汊均表现为冲刷下切;蓄水前大洪水对水道滩槽格局影响较大,蓄水后受水库调蓄影响,洪峰流量减小,水沙对滩槽格局的影响有所减弱。The reaches of the Yangtze River below Nanjing are mainly the branch river type.The movement of water and sediment,and riverbed erosion and deposition are complex by the combined action of runoff and tide.Taking the Yizheng waterway of key navigation obstructing shoal in 12.5 m deep water channel below Nanjing as an example,we analyze the evolution characteristics of this waterway before and after impoundment of the Three Gorges Reservoir according to the existing research results and the recently measured hydrological,sediment and topographic data,and discuss the influence of water and sediment changes on riverbed erosion and deposition after the impoundment of Three Gorges Project.The results show that after the impoundment of the Three Gorges Reservoir,the riverbed erosion and deposition are different from those before impoundment.Before the impoundment,the Shiyezhou left branch scours,and the right less deposition;after storage,both of them as scouring.Before the impoundment,the flood has a great influence on the pattern of the channel beach.After the water storage,the flood water is affected by the reservoir,and the flood decreases,the influence of the water and sand on the evolution of the beach is weakened.

关 键 词：三峡水库 水沙条件 河床演变 分汊河段 滩槽格局 

分 类 号：TV147[水利工程—水力学及河流动力学] U612[交通运输工程—船舶及航道工程]