阶梯形丁坝局部冲刷特性数值模拟  

Numerical simulation of local scour characteristics of step-shaped spur dike

作　　者：李国际 钟亮[1,2] 姜彤[1] 姜利 LI Guo-ji;ZHONG Liang;JIANG Tong;JIANG Li(National Engineering Research Center for Inland Waterway Regulation,Chongqing Jiaotong University,Chongqing 400074,China;Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学,国家内河航道整治工程技术研究中心,重庆400074 [2]重庆交通大学,水利水运工程教育部重点实验室,重庆400074

出　　处：《水运工程》2021年第8期93-100,189,共9页Port & Waterway Engineering

基　　金：重庆市基础科学与前沿技术研究项目(cstc2017jcyjAX0278)。

摘　　要：阶梯形丁坝局部冲刷特性研究对河道整治工程方案设计具有重要意义。应用平面二维水流泥沙数学模型,研究来流条件及丁坝尺度对阶梯形丁坝局部冲刷的影响。结果表明:在清水恒定流作用下,冲刷达到平衡所需历时主要受来流条件影响,而受丁坝几何尺度的影响相对较小;随着弗劳德数Fr的增大,冲刷坑面积A、最大冲深hs总体均呈线性增加,Fr≤0.565时平均冲深h随Fr增长较慢,Fr> 0.565时h随Fr增长相对较快;一级丁坝高度、二级丁坝长度对局部冲坑形态及冲深发展的影响具有一定的等效性;hs与h均随一级丁坝相对高度ψ的增加而增大,当ψ> 0.7时其增幅趋于平缓。The study of local scour characteristics of step-shaped spur dike is of great significance to the design of river channel regulation projects. We study the effects of inflow condition and spur dike size on local scour of step-shaped spur dike by using a 2 D flow and sediment mathematical model. The results show that under the constant flow of clear water, the time required for scour to reach equilibrium is mainly affected by the inflow condition, while the geometric scale of spur dike has relatively fewer impacts. With the increase of Froude number Fr,both the area of scouring pit A and the maximum scours depth hsincrease linearly. The mean scour depth h increases slowly with Fr when Fr ≤ 0.565,and h increases relatively faster with Fr when Fr > 0.565. The height of the first step spur dike and the length of the second step spur dike have a certain degree of equivalence in the influence of the local scour pit shape and scour depth development. Both hs and h increase with the relative height of the first step spur dike ψ,and the growth tend to be flat when ψ > 0.7.

关 键 词：阶梯形丁坝 冲刷过程 冲坑形态 数值模拟 

分 类 号：TV863[水利工程—水利水电工程] U617[交通运输工程—船舶及航道工程]