长江如皋沙群河段近期河道演变及其影响因素  

Analysis on recent river channel evolution and its influencing factors in Rugao sand shoals reach of Changjiang River

作　　者：尹大聪 卢金友[2] 渠庚[1] 柴朝晖[1] YIN Dacong;LU Jinyou;QU Geng;CHAI Chaohui(River Research Department,Changjiang River Scientific Research Institute,Wuhan 430010,China;Changjiang River Scientific Research Institute,Changjiang Water Resources Commission of the Ministry of Water Resources,Wuhan 430010,China)

机构地区：[1]长江科学院河流研究所,湖北武汉430010 [2]长江水利委员会长江科学院,湖北武汉430010

出　　处：《人民长江》2022年第3期13-20,共8页Yangtze River

基　　金：国家自然科学基金项目(51679011);国家重点研发计划项目(2018YFC0407802)。

摘　　要：如皋沙群河段位于长江下游澄通河段,其河道宽阔多汊,滩槽冲淤演变规律复杂,开展河道演变及其影响因素分析对该河段治理和保护具有重要意义。利用1977~2018年实测资料对如皋沙群河段的冲淤、深泓、滩槽以及典型断面的近期变化进行了系统分析,并在此基础上对河道演变的主要影响因素进行了探讨。结果表明:如皋沙群河段近年来河床总体呈冲刷发展趋势,深泓总体向左侧偏移,其中在如皋右汊最大偏移幅度达900 m;双涧沙防护部分左右缘小幅淤积,民主沙沙尾小幅下移,横港沙滩面淤积明显,2011~2018年横港沙在九圩港以上-5 m等高线以上河床平均淤积抬高0.62 m,深槽和典型横断面变化幅度趋小,总体呈缓慢刷深的态势,平面上表现为深槽的上提下挫;如皋沙群河段整体稳定性受河道边界条件、大洪水、来水来沙及人类活动的影响,其中人类活动影响较大,相关整治工程的实施使得该段总体河势趋于稳定。Rugao sand shoals reach is located in Jiangyin-Nantong reach of Changjiang River.The channel is wide and multi-branched,and the scouring and silting law in the shoal is complex.It is of great significance to study the channel evolution and its influencing factors for the treatment and protection of this reach.Based on the measured data from 1977 to 2018,we systematically analyzed the recent changes of erosion and deposition,thalweg,shoal channel and typical cross-sections of Rugao sand shoals reach and discussed the main factors of the channel evolution in the reach.The results showed that in recent years,the river bed of Rugao sand shoals reach had shown a general trend of scouring development,and the thalweg had shifted to the left generally,especially the maximum deviation range in the right branch of Rugao reach had reached 900 m.The left and right edges of Shuangjian shoal protection part were slightly silted,the end of Minzhu shoal slightly moved down,and the beach surface of Henggang shoal was obvious silted.From 2011 to 2018,the average siltation elevation of Henggang shoal in the riverbed above-5 m of Jiuweigang increased by 0.62 m,the variation range of deep grooves and typical cross-sections tended to be smaller,showing a trend of slowly scouring deep,and rise and deepening of deep grooves in plain view.The overall stability of Rugao sand shoals reach was affected by river boundary conditions,flood,incoming water and sediment,and human activities,among which human activities had a greater impact.The implementation of relevant regulation projects made the overall river regime of the section stable.

关 键 词：分汊河道 河床演变 河势 如皋沙群河段 

分 类 号：TV147[水利工程—水力学及河流动力学]