新水沙条件下三口分流分沙及荆江平滩河槽形态变化分析  

Analysis of Flow and Sediment Diversion at Three Outlets and Changes on Flat Beach Channel Morphology of Jingjiang River under the Condition of Fresh Water and Sediment

作　　者：周才金 沈健 熊慧 杜兴强 ZHOU Caijin;SHEN Jian;XIONG Hui;DU Xingqiang(Yangtze River Engineering Consulting Co.,Ltd.(Hubei),Wuhan 430014,China;Jingjiang Bureau of Hydrology and Water Resources Survey,Changjiang Water Resources Commission,Jingzhou 434000,China)

机构地区：[1]扬子江工程咨询有限公司(湖北),湖北武汉430014 [2]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：《人民珠江》2020年第6期22-26,共5页Pearl River

基　　金：国家重点研发计划课题(2016YFC0402303/05)。

摘　　要：长江中游荆江河段通过三口洪道与中国第二大淡水湖泊洞庭湖相连,形成了复杂的江湖关系,同时,三峡工程的运用,改变了荆江河段的水沙过程。对三口口门上、下游河段而言,沿程的水沙条件并不一致,导致河床演变特性存在一定差异。为此,以三口口门为界,将荆江划分为4个河段,分别统计2002-2017年各河段水沙特征,计算各河段冲淤量及年均冲刷强度,采用基于河段尺度的平滩河槽形态计算方法,得到各河段平滩水深、河宽及面积。分析结果表明:研究时段内四河段的平滩河宽总体变化很小;除枝城-松滋口河段外,平滩水深持续增加,河床有继续深化的趋势。The Jingjiang section at the middle reaches of the Yangtze River is connected to Dongting Lake,the second largest freshwater lake in China through three-outlet channels,forming a complex relationship between rivers and lakes.At the same time,the application of the Three Gorges Project has changed the water and sediment process of the Jingjiang section.As far as the upper and lower reaches of there-outlet entrance are concerned,the water and sediment conditions along the river are not consistent,leading to some differences in the evolution characteristics of the riverbed.To this end,this paper divides the Jingjiang Riverinto four river sections with the three-outlet entrance as the boundary,summarizes the water and sediment characteristics of each river section from 2002 to 2017,calculates the erosion and sedimentation amount and the average annual erosion intensity of each river section,and obtains the water depth,river width and area of the flat beach in each reach based on the calculation method of the flat beach channel morphology.The analysis results show that the overall changes on width of the flat beaches in the four river sections during the study period is small;and except for the Zhicheng-Songzi river section,the water depth of the flat bench continues to increase,and the river bed continues to deepen.

关 键 词：分流分沙 河道演变 三口洪道 三峡工程 

分 类 号：TV147[水利工程—水力学及河流动力学]