1987年5月大兴安岭森林大火的烟团扩散参数及热释放率的估计

本文叙述了1987年5月8日大兴安岭森林火灾烟羽形成的气象背景,由卫星烟羽照片计算了行走时间在6×10~4s以内的瞬时烟羽扩散参数。计算结果表明长度为100km的烟流瞬时扩散较接近线性律,更长的烟流则对3/2律符合得更好些,此外还用烟团抬升公式估计了5月7至8日大火的热释放量,计算值能与现场调查值在量级上相一致。

THE DIFFUSION PARAMETERS AND THE HEATRELEASING RATE OF THE FOREST-FIRE PLUME IN NORTHEAST OF CHINA IN 7TH-8TH MAY 1987

In this paper the meteorology background of the forming plume of the forest fire in Northeast of China in 7 th-8 th May 1987 is stated. The long range instantaneous diffusion parameters are calculated using the satellite photograph of the plumes with the lengthes ranged from 100 to more than 500 km. The results of the calculation show that the relations between the instantaneous diffusion parameters and travel time (up to 6×10⁴s) obey the law of linear and 3/2 power. In other hand the heat releasing from the fire in 7th-8th May estimated by puff rising formula at the same order can meet the value gained from a field survey.