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一、引言烟羽平面照相法因其原理简单、操作方便和价廉等优点,因而在国内外的大气扩散实验中被广泛地用来确定大气垂直扩散参数σ_z。由于受到地形条件和释放高度的限制,以及国内航空摄影尚有困难,故此法很少用于确定水平扩散参数σ_y。在1984年2月间的古交大气扩散实验中,我们利用102m气象铁塔,在塔顶释放大型或小型烟幕弹,仰视拍摄一组烟羽照片,获得姻羽的时间平均扩散σ_y和瞬时扩散σ_(y1)。
I. INTRODUCTION The plume imaging method is widely used to determine atmospheric vertical diffusion parameters σ_z in the atmospheric diffusion experiments at home and abroad for its simple principle, convenient operation and low cost. The method is seldom used to determine the horizontal diffusion parameter σ_y because of the constraints of terrain conditions and release height and the difficulty of domestic aerial photography. During the experiment of atmospheric diffusion in ancient times in February 1984, we used the 102m meteorological tower to release large or small smoke bombs on the top of the tower. Looking up a set of photos of plume, we obtained the time-averaged diffusion σ_y and instantaneous diffusion σ_y y1).