树冠火(crown fire)是指林冠层着火的森林火灾。火势很猛,能使树干烧伤或枯死。烟深灰色,树冠上的火浪常在地面火浪的前方,延烧速度随风速和地形而异,每小时为5—25公里。阻止其蔓延的方法是结合天然障碍物(河流、小溪、道路、区划线等)开辟防火线。
当地面火遇到大风时,或树干上缠绕着爬蔓植物和有低垂下来的树枝,火便上升到树冠,成为树冠火。
The wind, or fire meet tree-trunk enwinds climbing plants and have lowered down the branches of the tree and fire up to become crown fire.
通过数值分析,得到树冠火蔓延速度特性曲线,研究水份蒸发和有机物热解对树冠火蔓延速度的影响。
The effects of moisture vaporization and organic matter pyrolysis on crown fire spreading are discussed, and the characteristic curves are obtained by numerical calculation.
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