洞庭湖出流对荆江河段洪水位顶托影响分析  

Flood water level variation of Jingjiang reach caused by backwater effect of Dongting Lake

作　　者：江磊 曾子悦 JIANG Lei;ZENG Ziyue(Changjiang Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430010,China;Water Resources Department,Changjiang River Scientific Research Institute,Wuhan 430010,China)

机构地区：[1]长江勘测规划设计研究有限责任公司,湖北武汉430010 [2]长江科学院水资源综合利用研究所,湖北武汉430010

出　　处：《水利水电快报》2024年第10期8-11,共4页Express Water Resources & Hydropower Information

基　　金：国家重点研发计划项目(2023YFC3209503)。

摘　　要：荆江河段洪水位受洞庭湖出流顶托的影响,研究顶托影响的幅度和范围有助于深入认识长江干流荆江河段的防洪形势。基于实测水文资料设计了长江干流与洞庭湖不同的洪水遭遇组合,通过建立长江干流宜昌—大通的一维河网数学模型,分析了不同洪水遭遇组合下洞庭湖出流对荆江河段洪水位顶托壅高幅度及壅高影响范围。结果表明:荆江河段洪水位顶托壅高幅度与城陵矶出流强度呈正相关,顶托影响随着上游距离的增大而逐渐减小;荆江河段洪水位顶托影响范围与城陵矶出流强度呈正相关,考虑最不利的遭遇情况,对上游河段的影响范围至少到沙市。The flood water level of Jingjiang reach was influenced by the backwater of Dongting Lake.Study on backwater effect amplitude and scope can help to understand the flood control situation of Jingjiang reach deeply.Based on the measured hydrological data,different combinations of flood encounters in Dongting Lake were designed.The 1D unsteady flow network hydrodynamic numerical model from Yichang to Datong was developed,and backwater effect amplitude and scope of Jingjiang reach were studied by using the 1D model.The results indicated that backwater effect amplitude was positively related to the intensity of coming water from Dongting Lake and backwater effect decreased with the increase of the distance from upstream.The backwater effect scope was also positively related to the intensity of coming water from Dongting Lake.Under the most unfavourable meeting together of flood,the farthest backwater effect scope can reach to Shashi.

关 键 词：水位顶托 荆江河段 洞庭湖 城陵矶 江湖关系 宜昌—大通河段 

分 类 号：TV877[水利工程—水利水电工程]