摘要
本文分析了作者以前得到的一种扩散系数的某些结果,认为这种扩散系数解释了垂直湍流和风切变的联合作用使水平扩散增大的实验观测结果;建立了与雷诺应力间的函数关系,在简化情况下,与泰勒理论得到的结论类似。在边界层低层,湍流扩散系数与粘性系数是不相等的,有时会有较大差别。
Some results of the atmospheric diffusivity that the author has derived are discussed. This diffusivity explains the experimental observation that the vertical turbulence and wind shear increase the horizontal diffusivity, and gives the function between the diffusivity and the Reynolds stresses and in the simple form is similar with that derived from G. I. Taylor's theory. In the lower part of the planetary boundary layer(PBL), the turbulent diffusivity is different from the turbulent visco sity.
出处
《重庆环境科学》
1991年第1期20-24,共5页
Chongqing Environmental Science
关键词
湍流扩散
二阶闭合理论
分析
turbulent diffusion coefficient
turbulent viscosity
velocity correlation coefficint
second order closure theory
