摘要
边界层的各向异性研究对于了解实际大气的湍流特性和经典理论的适用范围均具有较大的意义。利用室内水槽实验模拟了实际大气边界层,使用小波变换方法分析了对数光强起伏谱的特征,将获得的标度指数与理论值进行比较,结果表明混合层在水平方向较为接近各向同性,而垂直方向则呈现一定的各向异性。
The study of boundary layer inhomogeneous is of great importance in studying the characteristic of atmospheric turbulence and the applicability of the classic theory. In this paper, the development of atmosphere boundary layer is simulated in a laboratory simulation tank, and beam patterns of mixed layer are recorded. Using wavelet transform method to determine the scaling region of the power spectrum of log-intensity from beam patterns in horizontal and vertical directions, the scaling exponents can be fitted and compared with the classic value of 8/3. The result shows that the mixed layer is quite homogeneous in horizontal direction and a little inhomogeneous in vertical direction.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2006年第3期372-376,共5页
High Power Laser and Particle Beams
基金
国家自然科学基金资助课题(40475009
40575005)
中国科学院安徽光机所大气光学重点实验室科学基金资助课题(2002-1)
关键词
大气边界层
各向异性
室内水槽模拟
对数光强功率谱
标度指数
Atmospheric boundary layer
Inhomogeneity
Laboratory tank simulation
Power spectrum of the log-intensity
Scaling exponent
