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引用本文:方娟娟,付菁,杨云平,许慧,贾梦琳,王建军,熊慧.长江下游仪征河段汊道分流属性及航道滩槽演变机制.湖泊科学,2022,34(4):1335-1346. DOI:10.18307/2022.0424
Fang Juanjuan,Fu Jing,Yang Yunping,Xu Hui,Jia Menglin,Wang Jianjun,Xiong Hui.Diversion attribute of the branch channels and shoal-channel evolution mechanism in the Yizheng section of the lower reaches of the Yangtze River. J. Lake Sci.2022,34(4):1335-1346. DOI:10.18307/2022.0424
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长江下游仪征河段汊道分流属性及航道滩槽演变机制
方娟娟1, 付菁2, 杨云平3, 许慧4, 贾梦琳3, 王建军3, 熊慧2
1.武汉大学水资源与水电工程科学国家重点实验室, 武汉 430072;2.长江水利水电开发集团(湖北)有限公司, 武汉 430010;3.工程泥沙交通运输行业重点实验室交通运输部天津水运工程科学研究所, 天津 300456;4.水利部交通运输部国家能源局南京水利科学研究院, 南京 210029
摘要:
长江下游仪征河段处于枯季潮流界的上边界,揭示其汊道分流属性及滩槽联动演变机制,对河势控制工程及深水航道工程实践具有重要意义.本研究收集了1955—2021年水文泥沙及地形等资料,在汊道分流关系及调整成因上:世业洲右汊的分流属性为枯水倾向型汊道,即低流量时期分流比大于高流量时期;1959—2021年期间,世业洲右汊分流比经历了“稳定-下降-上升”的调整过程,上游河段滩槽格局调整及流域来沙减少引起的汊道间不均衡冲刷是分流关系调整的主因;流域流量过程调整、河道崩岸等综合影响引起1959—2017年期间世业洲右汊分流比为减小态势,航道工程实施起到了调控汊道关系的功能,世业洲右汊分流比为增加态势.在滩槽联动演变关系上:仪征河段进口段以展宽为主,世业洲左汊展宽程度大于右汊,左汊河床形态变化与进口段滩槽形态的一致性关系优于右汊,即上游进口段滩槽演变、流域来沙量减少等综合作用会加速了左汊发展;2015年南京以下12.5 m深水航道二期工程建设以来,工程区域淤积且洲体完整性增强,且深槽冲刷及河槽容积增大,表明航道工程已实现汊道分流关系及滩槽调控的功能.
关键词:  汊道分流属性  流量过程  滩槽演变  驱动机制  长江下游  仪征河段
DOI:10.18307/2022.0424
分类号:
基金项目:国家重点研发计划项目(2018YFB1600400)和国家自然科学基金项目(51809131)联合资助.
Diversion attribute of the branch channels and shoal-channel evolution mechanism in the Yizheng section of the lower reaches of the Yangtze River
Fang Juanjuan1, Fu Jing2, Yang Yunping3, Xu Hui4, Jia Menglin3, Wang Jianjun3, Xiong Hui2
1.State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, P. R. China;2.Changjiang Water Resources and Hydropower Development Group (Hubei) Co., LTD., Wuhan 430010, P. R. China;3.Key Laboratory of Engineering Sediment Transportation Industry, Tianjin Research Institute for Water Transport Engineering, Ministry of Transport, Tianjin 300456, P. R. China;4.Nanjing Hydraulic Research Institute, National Energy Administration, Ministry of Transport, Ministry of Water Resources, Nanjing 210029, P. R. China
Abstract:
The Yizheng section at downstream of the Yangtze River is at the upper section of the tidal current boundary in the dry seasons, revealing its attributes of branch channels diversion and the linkage evolution mechanism of shoal-channel, which is of great significance to river regime control engineering and deep-water channel engineering practice. In this study, hydrological, sedimental and topographic data from 1955 to 2021 were collected. In terms of the diversion attribute and adjustment causes of the branches:the diversion attribute of the Shiyezhou branch is characterized by low flow tendency, that is, the diversion ratio in low flow period is higher than that in high flow period. From 1959 to 2021, the right-branch flow split ratio of Shiyezhou experienced a process of "stable-descending-rising", and the main reason for the adjustment of the distributary relationship is the regulation of the shoal-channel pattern in the upstream of the river and the unbalanced scouring between the branches caused by the decrease of the incoming sediment. The adjustment of the flow process and channel collapse reduced the diversion ratio of the right branch from 1959 to 2017. The implementation of the waterway projects can control the channel relationship and make the diversion ratio of the right branch of the river increase. In the development of linkage relationship of the shoal-channel:the entrance section of Yizheng section is mainly widened, while the width of the left branch of Shiyezhou is larger than that of the right branch, the consistency between the changes of the riverbed morphology of the left branch and shoal-channel morphology of the inlet section is better than that of the right branch. The development of the left branch is accelerated by the evolution of the channel and the decrease of sediment transport in the upstream inlet section. Since the second phase of the following 12.5 m deep-water waterway project in Nanjing (2015), the area is silted up, the integrity of the continent is enhanced, and the deep channel is scoured and channel volume increase, showing that the channel engineering has realized the function of distributary relation and regulation of shoal-channel.
Key words:  Diversion attribute of the inlet  discharge process  shoal-channel evolution mechanism  driving mechanism  Yizheng section  lower reaches of the Yangtze River
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