一、引言烟羽抬升高度的确定,对于地面污染物浓度的估算具有重要意义。抬升高度本身还对烟囱的设计、空气污染模式的应用及环境危害的评价有实际应用价值。烟羽从烟囱中排出后,一方面受平均风的作用向下风向迁移,另方面,又因其自身的动量和浮力特性而不断向上抬升。初期,由于烟羽的相对运动、平均风作用和烟羽对空气的卷吸效应,从而对抬升的抑制具有很大的影响;随后,主要是湍流混合最终耗尽烟羽的动力和浮力,使烟羽的迁移达到一个基本稳定的高度,也就是说,烟羽中心线的坡度变化接近最 I. INTRODUCTION The height of plume uplift is of great significance for estimating the concentration of pollutants on the ground. The height of the lift itself also has practical value for the design of chimneys, the application of air pollution modes and the evaluation of environmental hazards. After being discharged from the chimney, the plume migrates downwind on the one hand by the action of the mean wind and on the other hand rises upward due to its own momentum and buoyancy characteristics. Initially, due to the relative motion of the plume, the mean wind effect and the entrainment effect of the plume on the air have a great influence on the suppression of the ascent, followed by the turbulent mixing and finally the exhaustion of the plume’s momentum and buoyancy, The migration of plume reaches a basically stable height, that is to say, the gradient of plume center line changes close to the most