兰州市近地层垂直扩散参数的研究  

A Study on Vertical Dispersion Parameter i n Surface Layer of Lanzhou City

作　　者：付培健[1] 王式功[1] 陈晋北[2] 

机构地区：[1]兰州大学资源环境学院大气科学系,甘肃兰州730000 [2]甘肃农业大学基础部,甘肃兰州730070

出　　处：《兰州大学学报（自然科学版）》2000年第3期180-184,共5页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金!(4 98750 0 4 );高等学校骨干教师资助计划资助项目

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 .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.

关 键 词：大气扩散 大气污染 兰州市 垂直扩散系数 近地层 

分 类 号：X169[环境科学与工程—环境科学] P404[天文地球—大气科学及气象学]