森林特殊火行为格局的卫星遥感研究

由于多变的天气条件，复杂的地形和植被分布，引起火行为格局的变化，借助GIS和卫星遥感技术，以1987年大兴安岭5．6大火为对策，进行火行为变化规律和火行为的时空格局研究，环境风对火行为具有决定性作用，大风期间火强度极高，过火区为火蔓延的廓道，较大的山脉对林火有阻隔作用，森林采伐改变可燃物连续性，可以改变火行为，人类扑火对大火作用不明显，小地形可产生不同火烧强度的细微结构。

Study of the Pattern of Special Forest Fire Behavior by Using Satellite Remote Sensing

Satellite remote sensing data, i.e. NOAA AVHRR, are used to analyze fire regime and behavior, and their relationship with spatio temporal patterns of forest fire behavior is studied from the viewpoint of burned areas by means of multi scale technology. Documented fire data from 1987 1989 in Great Xing'an Mountain Area are used to show the fire regime of this area, and satellite images of the famous fire arising on May 6th, 1987 are used as a case to study the fire behavior. Large fire maps are produced to analyze the dynamic fire behavior. fire behavior is mainly determined by wind, and strong wind helps the fire to cause great damages of forest area. River can stop the fire by serving as the corridor of fire spread when the spread is along the river. Large mountain can obstruct the fire spread. Felling of forest trees creates fuel discontinuity and hereby changes the fire behavior. Fire fighting doesn't play a significant role in the control of large fires. Microtopegraphy leads to fine structures with different fire intensities.