Abstract: Xuejiadao area in Tsingdao city in July 1993 and in Changping suburban, Beijing in April 1994. The instrument used for observation is three-component anemonmeter. Following Draxler′s empirical formula, the diffusion parameters of Tsingdao area and Changping area are calculated. Meanwhile the calculation formula suitable for the two areas is put forward and the results are compared with Pasquill′s. It is found that the diffusion parameter of coastal area of Tsingdao is a little lower than the inland ones. Moreover, because of the different roughness of underlying surface and thermodynamic conditions, the diffusion characters are distinctly different between coastal area and inland, as well as between off-sea wind and off-shore wind.

Key words: three-component anemometer, turbulence intensity, stability conditions, diffusion parameters

摘要： 根据1993年7月在青岛市薛家岛地区和1994年4月在北京昌平市郊利用三分量风速仪测得的2次野外观测资料，分别计算了不同稳定度下的湍流度，同时参考 R.R.Draxler的经验公式，并将计算结果与F.Pasquill和G.A.Briggs的结果作了比较，发现青岛沿海地区扩散参数系统比F.Pasquill和G.A.Briggs的小，而内陆昌平地区略为偏高。同时还比较了沿海与内陆，向岸流与离岸流的扩散特征。因为下垫面粗糙度与热力条件的差异，两者有明显差别。研究结果有可靠的理论基础和应用价值。

关键词: 三分量风速仪, 湍流度, 稳定度, 扩散参数