【摘要】 利用 1993年兰州市西固区域发展环境评价试验资料 ,求取低层大气平均风速与垂直扩散系数的分布 ,由此进一步计算了兰州市不同稳定度条件下扩散参数的值 ,并与 Pasquill扩散曲线方法的取值进行了比较 .结果发现 :兰州地区垂直扩散参数要比由 Pasquill扩散曲线求出的值高出0 .5～ 10倍 .更多还原

【Abstract】 The vertical diffusion parameter is an important one for calculating air pollutants. Over even lands, P asquill diffusion curves are used validly to get the parameter. Until now there has been no effective method for getting the diffusion parameter over complex te rrains or mountain areas. The no time dependent diffusion equation was used to calculate the vertical diffusion parameter, and field data(1993) in Xigu distric t, Lanzhou City were used to determine the contour of wind and coefficient of ve rtical dispersion, and then to get the vertical parameter. Through our study w e discovered that the vertical parameter was about twice as high as that calcula ted by pasquill diffusion curves in stable conditions, and one and a half as hig h in unstable conditions.更多还原