【摘要】 大气扩散研究中,K理论是很重要的一个研究方向,但如何将扩散系数K表示为可测气象参数和时空坐标的函数,仍没有公认的办法。本文从Donaldson以二阶闭合方法导出的污染物湍流脉动通量方程出发,求出了污染物湍流脉动通量与平均浓度梯度间关系的完整形式,与K理论相比,得到了扩散系数。更多还原

【Abstract】 In studies of atmospheric diffusion, K - theory is very important. However, there hasn’t been any generally accepted method to relate the turbulent diffusivityK to detectable meteorological, parameters, and space and time coordinates. Start -ing from the equations of pulsating fluxes of pollutants turbulence derived by C P.Donaldson using the second order closure, we get a complete expression formfor the relationship between the gradients of mean concentration and the fluxes. Comparing it with K-theory, we obtain the turbulent diffusion coefficient.更多还原