长江澄通河段汊道分流比变化规律  

Variation Law of Flow Partition Ratio within Branching Channels of the Chengtong Reach of the Yangtze River

作　　者：朱博渊 黄敏[1,2] 郑宇轩 秦剑豪 张春财 程永舟[1,2] ZHU Bo-yuan;HUANG Min;ZHENG Yu-xuan;QIN Jian-hao;ZHANG Chun-cai;CHENG Yong-zhou(School of Hydraulic and Environmental Engineering,Changsha University of Science&Technology,Changsha 410114,Hunan Province,China;Key Laboratory of Water-sediment Sciences and Water Disaster Prevention of Hunan Province,Changsha 410114,Hunan Province,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]水沙科学与水灾害防治湖南省重点实验室,湖南长沙410114

出　　处：《中国农村水利水电》2023年第2期80-87,共8页China Rural Water and Hydropower

基　　金：国家自然科学基金青年项目(52209079);湖南省教育厅科学研究项目—优秀青年项目(20B021);湖南省自然科学基金青年项目(2021JJ40607)。

摘　　要：为探究感潮型分汊河道水动力变化规律,以长江澄通河段为对象,利用2004年洪季和2005年枯季实测水文、地形资料,分析内部各水道两汊落、涨潮分流比随径潮强度的变化特征和机制。结果表明:同一径流流量下各水道两汊落、涨潮分流比随相对潮位的变化取决于潮流流速在两汊间的消长速度,同一相对潮位下各水道两汊落、涨潮分流比随径流流量的变化取决于不同径潮强度对比下落潮主流流路、沿岸节点挑流作用、涨潮水位和涨潮流速。In order to explore variation law of hydrodynamics in tidal branching channels,this paper investigates the changing features and mechanisms of ebb-tide and flood-tide partition ratios within two branches of waterways of the Chengtong reach of the Yangtze River under varying runoffs and tide forces by using measured hydrologic and topographic data during the wet season in 2004 and the dry season in 2005.Results show that variations of ebb-tide and flood-tide partition ratios in the two branches of the waterways under varying relative tidal level and a certain runoff discharge are determined by the decline-growth rates of tidal current velocities in the two branches,while the variations of the ebb-tide and flood-tide partition ratios in two branches of the waterways under varying runoff discharge and a certain relative tidal level depend on paths of ebb-flow axes,deflecting effects on the flow of alongshore nodes,flood tidal levels and flood tidal velocities under different confrontation strengths between runoffs and tides.

关 键 词：澄通河段 汊道 分流比 径潮动力 

分 类 号：TV143[水利工程—水力学及河流动力学]