水沙条件对大湖口河冲淤特性的影响  

Influence of water and sediment conditions on scouring and silting characteristics of Dahukou River

作　　者：常留红[1,2] 覃瓶山 郑景琦 刘晓群 孙文硕 汤薇 CHANG Liuhong;QIN Pingshan;ZHENG Jingqi;LIU Xiaoqun;SUN Wenshuo;TANG Wei(School of Hydraulic and Environmental Engineering,Changsha University of Science&Technology,Changsha 410114,China;Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province,Changsha 410114,China;Hunan Institute of Water Resources and Hydropower Research,Changsha 410007,China)

机构地区：[1]长沙理工大学水利与环境工程学院,湖南长沙410114 [2]洞庭湖水环境治理与生态修复湖南省重点实验室,湖南长沙410114 [3]湖南省水利水电科学研究院,湖南长沙410007

出　　处：《水利水电科技进展》2022年第4期15-20,共6页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(51809022);湖南省水利科技项目(XSKJ2018179-41)。

摘　　要：为了解水沙条件变化对大湖口河冲淤特性的影响,基于二维水沙数学模型,模拟了典型年份洪、中、枯不同水沙条件下该河段冲淤情况,分析泥沙冲淤及河势变化。结果表明:大湖口河原始冲淤表现为第一、二、四段淤积,第三段冲刷,但水沙条件的变化,使得大湖口河河床冲淤整体呈现出上淤下冲的态势,河道断面冲淤表现为左淤右冲,冲淤程度进一步加强。随着上游来水来沙的变化,大湖口河将逐渐向单一、弯曲性河道演变,从而对大湖口河的防洪产生一定的影响。To understand the influence of water and sediment conditions on scouring and silting characteristics of the Dahukou River,based on a two-dimensional numerical model of water and sediment,the scouring and silting of the river reach under different water and sediment conditions in typical years of flood,normal and dry were simulated,and the changes of sediment scouring and silting and river morphology variation were analyzed.The results show that the original scouring and silting of the Dahukou River is represented by the first,second and fourth sections of silting,and the third section of scouring.The change of water and sediment conditions makes the riverbed scouring and silting of the Dahukou River generally show the trend of silting upstream and scouring downstream.The scouring and silting of the river section are characterized by silting along the left bank and scouring along the right bank with enhanced degree of scouring and silting.With the change of incoming water and sediment in the upstream,the Dahukou River gradually evolves into a single and curved channel,which may have certain impacts on the flood control.

关 键 词：水沙条件 河势变化 河道冲淤 大湖口河 

分 类 号：TV122[水利工程—水文学及水资源]