刚性植被密度对岸滩作用的数值模拟  

Numerical simulation of effect of rigid vegetation density on banks and beaches

作　　者：肖苡辀 张国志[1,2,3,4] 冯先导[1,2,3,4] 陈文峰 XIAO Yi-zhou;ZHANG Guo-zhi;FENG Xian-dao;CHEN Wen-feng(CCCC Second Harbor Engineering Co.,Ltd.,Wuhan 430040,China;Key Laboratory of Large-span Bridge Construction Technology,Wuhan 430040,China;Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure,Wuhan 430040,China;CCCC Highway Bridge National Engineering Research Centre Co.,Ltd.,Wuhan 430040,China)

机构地区：[1]中交第二航务工程局有限公司,湖北武汉430040 [2]长大桥梁建设施工技术交通行业重点实验室,湖北武汉430040 [3]交通运输行业交通基础设施智能制造技术研发中心,湖北武汉430040 [4]中交公路长大桥建设国家工程研究中心有限公司,湖北武汉430040

出　　处：《水运工程》2020年第12期33-37,52,共6页Port & Waterway Engineering

基　　金：中国博士后科学基金第61批面上资助项目(2017M612541)。

摘　　要：岸滩修复工程通常会利用植被来增加岸边的稳定性。为研究刚性植被对水流、床面形态的影响,以圆柱代替刚性植被进行了不同植被密度下的植被-水流-泥沙数值模拟研究,并分析了植株周围水流流速、床面切应力与植被密度的关系。结果表明:1)数值模拟流速结果与试验结果较为吻合。2)随着植被密度的增加,流速、床面切应力均呈现先增大后减小的规律。3)床面形态变化规律显示,当植被密度增加到一定程度时,整体形成沙脊的现象不那么明显,而是以单根植被下游近区的局域沙堆出现。Beach restoration projects often use vegetation to increase the shore stability.In order to study the influence of rigid vegetation on hydrodynamics and morphology,the cylinder is used instead of rigid vegetation to carry out a numerical simulation study of vegetation-flow-sediment under different vegetation densities,and the relationship of vegetation density with the velocity and bed shear stress is analyzed.The results shows that:1)The numerical simulation flow velocity is consistent with experimental data.2)With the increase of vegetation density,the velocity and bed shear stress increase first and then decrease.3)The bed morphology change law shows that the overall formation of sand ridge is not so obvious when the vegetation density increases to a certain degree,but appears as a local sand pile near the lower reaches of the single vegetation.

关 键 词：植被密度 泥沙 水力特性 数值模拟 

分 类 号：U655[交通运输工程—港口、海岸及近海工程]