长江老海坝段河床形态对抛石护岸的响应研究  

Study on the Response of River Bed Morphology to Riprap Revetment in the Laohaiba Reach of the Yangtze River

作　　者：朱昊 王茂枚 赵钢 蔡军 姜果 ZHU Hao;WANG Mao-mei;ZHAO Gang;CAI Jun;JIANG Guo(Jiangsu Provincial Hydraulic Research Institute,Nanjing 210017,China)

机构地区：[1]江苏省水利科学研究院,江苏南京210017

出　　处：《水电能源科学》2022年第5期118-122,117,共6页Water Resources and Power

基　　金：江苏省水利科技项目(2017009,2020007);国家自然科学基金项目(51520105014);江苏省“333”工程科技资助项目(BRA2020363)。

摘　　要：为研究长江下游抛石护岸工程实施对河床形态变化的影响,基于实测资料分析了工程河段的泥沙运动特征,采用Delft3D软件建立二维水沙动力地貌数值模型,通过模拟不同时间段工程前后河床演变情况,分别对河床冲淤变化、河床形态变化、河道断面变化等进行对比分析。结果表明,无工程时,河道南岸由于深槽贴近且受水流顶冲严重,年最大冲深达12 m,工程实施后,抛石区内冲刷态势有所抑制,部分区域改为缓慢淤积,工程区外侧深槽发生带状冲刷;从等深线变化来看,工程后,-20 m等深线最大偏移量从90 m大幅减小至20 m,河床平面形态变得较为稳定;从断面变化来看,除了冲刷严重区域工程后深泓线向离岸侧有所偏移,其余断面深泓线变化工程影响较小。所得结果可为抛石护岸的定期监测和维护提供参考。In order to study the impact of the implementation of the rubble revetment project on the riverbed mor-phol ogychange in the lo wer reaches of the Yangtze River, the hydrodynamic and sediment characteristics of the engineer-ingreach were analyzedbased on the measured data. The Delft3 D software was used to establish a two-dimensional nu-meric al model of hydrodynamic and sediment topography. By simulating the riverbed evolution before and after the pro-ject,the riverbed erosion and deposition change, riverbed morphology change, and river section change were compared andanaly zed. The results show that when there is no project, the south bank of the river is close to the deep groove and seriouslyimpacted by the water flow, and the maximum erosion depth is up to 12 m. After the implementation of theproject, the erosion situation in the arubble nnuaarea lis inhibited, and some areas are changed to slow deposition, and the dee p groove outside the project area has zonal erosion. From the change of contour, after the project, the maximum offset of-20 m contour decreases significantly from 90 m to 20 m, and theriverbed plane morphology becomes more stable. Fro mthe perspective of cross-section change, except that the thalweg line of fsets to the offshore side after the project in thes everely scour ed area, the change of thalweg line in other sections is lessaffected by the project. The results can pro-videreference forregular monitoring and maintenance of rubble revetment.

关 键 词：长江下游 抛石护岸 河床形态 水沙特征 

分 类 号：TV85[水利工程—水利水电工程]