长江老海坝抛石护岸工程对河势的影响研究
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摘要
为研究洪水期抛石护岸工程对河势的影响,采用MIKE21平面二维水沙数学模型,对长江老海坝有无抛石护岸工程两种工况下的水流特性和深泓线的变化进行对比分析。结果表明,工程对抛石护岸区附近的水流特性影响较大,距近岸起点越远,断面水位和平均流速变化越小。抛石护岸工程区距近岸起点0~600 m范围内水位壅高明显,最大壅高0.028 m,0~400 m范围内断面平均流速明显减小,最大减小0.2 m/s。工程后,澄通河段区域水位及流速变化不大,深泓线总体走势不变,深泓摆动不大,在浏海沙水道深泓有所左移,有利于局部河势稳定。
Two-dimensional numerical model of flow and sediment in MIKE 21 software was used to study the effects of riprap revetment on river regime during flood period. The paper analyzes the differences of the characteristics of flow and thalweg between with and without riprap revetment conditions along Laohaiba reach of the Yangtze River. The results indicate that the water levels and velocities change obviously in the area of riprap revetment. The farther away from the starting point is,the smaller the impact on the flow characteristics.Water level increases greatly in the range from the starting point 0 to 600 m,the maximum increase value is0. 028 m. Mean velocity decreases in the range of 0 to 400 m,and the maximum decrease value is 0. 2 m/s.The water level and velocity don't change significantly in the large range of Cheng-Tong Reach. The overall trend of the thalweg is stable,and there is a little swing of thalweg to the left in Luihai shoal waterway,which is beneficial to the stability of river regime.
Two-dimensional numerical model of flow and sediment in MIKE 21 software was used to study the effects of riprap revetment on river regime during flood period. The paper analyzes the differences of the characteristics of flow and thalweg between with and without riprap revetment conditions along Laohaiba reach of the Yangtze River. The results indicate that the water levels and velocities change obviously in the area of riprap revetment. The farther away from the starting point is,the smaller the impact on the flow characteristics.Water level increases greatly in the range from the starting point 0 to 600 m,the maximum increase value is0. 028 m. Mean velocity decreases in the range of 0 to 400 m,and the maximum decrease value is 0. 2 m/s.The water level and velocity don't change significantly in the large range of Cheng-Tong Reach. The overall trend of the thalweg is stable,and there is a little swing of thalweg to the left in Luihai shoal waterway,which is beneficial to the stability of river regime.
引文
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[2]潘庆燊.长江河流研究进展[J].人民长江,2010,41(9):64-68.
[3]张明进,张华庆,白玉川.我国河流水流泥沙数值模拟技术进展与应用[J].水道港口,2011,32(5):329-335.
[4]Razak Z,Zuhairi A,Shahbudin S,et al.2-Dimensional hydrodynamic patterns of Pahang River Estuary,Pahang,Malaysia during northeast and southwest monsoon[C]//Diterbitkanoleh,International Symposium on Sustainability Science and Management.Terengganu:UMT,2012:1357-1371.
[5]枚龙.基于MIKE模型在内河航道整治中应用研究[D].重庆:重庆交通大学,2014:31-43.
[6]王增钦.MIKE21 FM在桥梁壅水分析中的应用[J].中国农村水利水电,2015(3):161-163.
[7]张大茹.基于Mike21FM的山区小流域涉水工程防洪影响研究[D].北京:中国水利水电科学研究院,2015:45-68.
[8]陈颂伟.浅析长江老海坝九龙港以下近岸河床冲刷成因[J].中国水利,2002(11):69-70.
[9]张玮,杨松,许才广,等.长江张家港老海坝段水动力及冲刷分析研究[J].水道港口,2016,37(2):147-153.
[10]姚仕明,卢金友,周宜林.长江中下游护岸工程技术与防护效果研究[C]//中国水利学会第三届青年科技论坛论文集.郑州:黄河水利出版社,2007:442-446.
[11]罗秋实,黄鑫,李洪良,等.基于二维水沙模型的涉水建筑物防洪影响计算[J].人民长江,2010,41(10):52-55.
[12]黄颖,李义天.维持通航建筑物口门水深的护底加糙措施研究[J].水利学报,2005,36(2):141-146,154.
[13]褚明华,黄先龙.2016年长江中下游崩岸应急整治思考[J].中国水利,2016(21):10-11+16.