| 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。 |
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| DETERMINING DIFFUSION COEFFICIENT USING THE SECOND ORDER CLOSURE THEORY |
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Hu Zhenglin
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Dept. of Atmospheric Sciences Z hong shan Universit y
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| 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. Starting 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. |
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