摘要 长江下游河道以分汊河段为主,航道条件复杂且航道整治难度大,探究其汊道分流属性及分流比调整的驱动机制,对枯水期通航主汊道的选取具有重要意义。以长江下游东流水道为对象,剖析了东流水道近10 a来汊道分流比调整的驱动机制。结果表明:1999~2004年期间东港为洪水倾向型汊道,西港为枯水倾向型汊道;2005~2009年间,受航道整治一期工程的影响,东港分流比与流量的关系不显著,西港仍为枯水倾向型汊道;2010~2018年间,东、西港汊道属性发生转变。东流水道老虎滩左汊及西港的底沙输移强度高于老虎滩左汊及莲花洲汊道,进一步加速了东流水道汊道分流关系的调整趋势。 The lower reaches of the Yangtze River are dominated by branch reaches,which have complicated channel conditions and are difficult in channel regulation.The research on branch diversion characteristics and driving mechanism of diversion ratio adjustment is important to the determination of main navigation branch in dry season.based on the analysis of the characteristics of erosion and deposition in Dongliu reach of lower Yangtze River,the driving mechanism of diversion ratio adjustment in the past 10 years was discussed.The results showed that from1999 to 2004,the diversion ratio of Donggang branch increased in flood period,while that of Xigang branch increased in dry period;from 2005 to 2009,in the first phase of waterway regulation,the relationship between the diversion ratio of Donggang branch and the flow was not significant,and the diversion ratio of Xigang branch increased in dry period;from 2010 to 2018,the branch flow characteristics of Donggang and Xigang was reversed.The sediment transport intensity from the left branch of Laohu bar to Xigang was larger than that from the left branch of Laohu bar to Lianhuazhou branch,which further accelerated the adjustment trend of the diversion ratio.
机构地区 宜昌市水利技术推广服务站 长江航道规划设计研究院
出处 《水利水电快报》 2021年第4期29-34,41,共7页 Express Water Resources & Hydropower Information
关键词 汊道分流 分流比 调整机制 东流水道 通航条件 长江下游 branching flows diversion ratio adjustment mechanism Dongliu reach navigation condition lower Yangtze River
