Physical Modelling of Leaf Scorch Height From Prescribed Fires in Young Eucalyptus Sieberi Regrowth Forests in South-Eastern Australia
Physical Modelling of Leaf Scorch Height From Prescribed Fires in Young Eucalyptus Sieberi Regrowth Forests in South-Eastern Australia
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澳大利亚东南部西伯利亚幼树再生林规定火灾引起的叶子烧焦高度的物理模型
DOI：
10.1071/wf9970007
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
A. Sullivan
中科院分区：
文献类型：
--
作者：
J. Gould;I. Knight;A. Sullivan
在澳大利亚新南威尔士州东南部的年轻沿海银顶灰（桉树）再生林中，记录了56次实验规定的火灾的天气、燃料和火灾行为的信息。在其中14起火灾中测量了火灾上方的热环境。现有的羽流模型，基于均匀燃烧的线火的假设，被发现预测不足的空气上升到树冠的温度。基于非均匀可燃物中的火灾不是均匀燃烧的线状火灾这一事实，利用标准羽流上升方程建立了轴对称羽流模型。这个模型，称为零星轴向模型（SAM），使用一个火灾的数据进行校准。该模型可以由已知的环境温度和拜拉姆火线强度来预测焦烧高度。SAM模型表明，在平静条件下燃烧的规定火灾的烧焦高度将大于在强风条件下燃烧的相同强度的规定火灾。
Information on weather, fuel and fire behaviour were recorded on 56 experimental prescribed fires in young coastal silvertop ash (Eucalyptus sieberi) regrowth forest in south-east New South Wales, Australia. The thermal environment above the fire was measured in 14 of those fires. Existing plume models, based on the assumption of a uniformly burning line fire, were found to under-predict the temperature of the air rising into the canopy. An axially symmetric plume model, based on the observation that fires burning in non-uniform fuels are not uniformly burning line fires, was developed using standard plume rise equations. This model, called the Sporadic Axial Model (SAM), was calibrated using data from one fire. This model can be used to predict scorch height from known ambient temperature and Byram's fire line intensity. The SAM model suggests that scorch height will be greater for prescribed fires burnt under calm conditions than prescribed fires of the same intensity burnt under stronger wind conditions.