基于ADCP的感潮型分汊河道径流变化研究

Study on Runoff Variation of Tidal Branching Channel Based on ADCP

经历汛期高水位后,长江局部河势出现变化,水流贴岸顶冲部位调整,崩岸时有发生。以长江芜湖河段大拐段潜洲为研究对象,通过对比2023年枯水期和丰水期的实测水文资料和地形资料,基于ADCP的水文测验成果,分析感潮型分汊河道的径流变化规律。结果表明,潜洲分汊河道从枯水期进入丰水期后,径流流速提高1.6~2.6倍,流向与断面垂线夹角变小,主汊分流比占比下降,支汊分流比占比提高且冲深加剧。研究结果可为河演分析和护岸工程实施提供依据。

After experiencing high water levels during the flood season,local river regimes of the Yangtze River in Anhui have undergone changes,with changes to areas where the flow is bank-bounding and top-cutting,and bank collapses occurring intermittently.Taking the island Qianzhou at Wuhu Daguai reach as the research object,this paper analyzes the runoff change of tidal branching channels by comparing the measured hydrological data and topographic data in the dry season and the wet season of 2023,and based on the hydrological test results of ADCP.The results show that the flow velocity in the Qianzhou bifurcation channel increases by 1.6 to 2.6 times when the wet season comes,the angle between the flow direction and the vertical line decreases,and the branching ratio increases significantly,leading to intensified erosion.The research results provide a reference for analyzing river evolution trends and implementing engineering measures.