植被覆盖地表空气动力学粗糙度与零平面位移高度的模拟分析  

Simulation Analysis of Vegetation Covered Surface's Aerodynamics Roughness Length and Zero Displacement

作　　者：张雅静[1] 申向东[1] 

机构地区：[1]内蒙古农业大学水利与土木建筑工程学院,内蒙古呼和浩特010018

出　　处：《中国沙漠》2008年第1期21-26,共6页Journal of Desert Research

基　　金：国家自然科学基金项目(10262001);重大基础研究前期研究专项项目(2002ccc03400)资助

摘　　要：空气动力学粗糙度、零平面位移高度是植被覆盖地表的两个重要的空气动力学特征参数,利用数值计算的方法,运用Matlab软件编程,对内蒙古四子王旗草地地表的空气动学粗糙度、零平面位移高度进行模拟计算、绘图及分析。得到了在8种植被密度和6种植被高度情况下摩阻速度、空气动学粗糙度、零平面位移高度与风速的关系,并与野外实验数据进行对比分析,发现模拟值可以很好的反映空气动力学参数的性质。进而分别得到了包括植被密度的风速与摩阻速度、空气动学粗糙度的关系式和包括植被高度的风速与摩阻速度、空气动学粗糙度的关系式,这有助于进一步研究该地区草地风沙运动机理,以及床面与近地层气流相互作用的力学性质。Aerodynamic roughness length （ARL） and zero displacement height are important aerodynamic parameters of vegetation covered surface. By the numerical method and the Mathematics Software Matlab the aerodynamic roughness length and displacement height of vegetation covered surface in Siziwangqi of Inner Mongolia was simulated. The relations of aerodynamic parameters with wind velocity under 8 kinds of vegetation density and 6 kinds of vegetation height have been gotten, and the result has been compared with the field experimental data. For details, the following models have been given in simulation： relation models of wind speed with friction speed and aerodynamic roughness length under different vegetation density and different vegetation height. These models could be used to estimate the aerodynamic parameters. The research conclusion has profound significance in further studying about sandstorm movement mechanism over vegeta- tion covered surface and about the mechanical characteristics on interaction between vegetation covered surface and boundary layer air.

关 键 词：植被覆盖 空气动力学 MATLAB软件 模拟 

分 类 号：O357.4[理学—流体力学]