摘要
林火扩展具有时间和空间特征。对火场模拟必须建立在空间背景数据库之上，即在地理信息系统和遥感技术的辅助下完成。森林火灾的发生发展有内在和外在因素的影响，内在因素包括了可燃物类型、可燃物湿度、地形，考虑这些因素形成了像元尺度植被燃烧基本历时图；外在因素主要是气候的影响，文中利用生成的植被起火概率图控制像元是否起火。在火场扩展中将Ｒｏｔｈｅｒｍｅｌ模型和经验模型结合使用，并考虑了坡度和风向带方向的因素的影响。最后利用迷宫算法在计算机上实现了火场在地理信息系统支持下的空间蔓延动态模拟。
It’s very important for the decision division to imitate fire behaviorquantitatively.Fire spread has the features of time and space.That means it mustbe established under space background data base and must be fulfiled by the helpof GIS and RS.The occurrence and development of forest fire are infuienced by someinternal and external factors Internal factors include fuel type,fuel moister and to-pography.By using these factors we created the time map of fire spread in pixel. External factors are mainly attributed to the infulence of climate. We determinedwhether the pixel would burn or not according to the map of burning probability.We used both Rothermel model and experiential model for fire spread Meanwhiledirectional factors such as slope and wind were also taken into account.Finally wecompleted the fire spread in microcomputer based on GIS.
出处
《环境遥感》
CSCD
1995年第2期81-88,T001,共9页
基金
国家自然科学基金
关键词
GIS
森林
火灾
林火蔓延
遥感
空间模拟
Fire spread,Geographic information system,Computer simulation,Remote sensed application
