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Analysis on Downwind Distribution of Firebrands Sourced from a Wildland Fire

机译:荒地火灾产生的火标顺风分布分析

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Generation of firebrands from a wildland fire and their distribution downwind are studied using an analytical approach. The processes considered include emission of firebrands, wind-driven transport and the associated spot ignition. Emission of the firebrands from a fire front is treated as a stochastic process reflecting the interaction between gas flow plume and the burning fuel debris formed, with the emission rate being dominated by the rate of fuel consumption, emission factor and a function of firebrand sizes. Analogous to the random distribution of non-burning windborne particles, the transient distribution of firebrands downwind is described by a statistical pattern of Rayleigh form. Number and mass of firebrands landed downwind within the maximum travel distance are then determined by integration over the entire impact period during fire spread and burning-out processes. Application of the model to the bushfire occurred in Canberra, Australia in 2003 indicates that this model provides reasonable prediction in the distribution of firebrands downwind, and quantitatively exhibits the role of ember attack in massive destruction of houses at urban interface.
机译:使用分析方法研究了野火产生的火斑及其顺风分布。所考虑的过程包括散发火种,风驱动运输和相关的点燃。从火锋发出的火brand被视为一种随机过程,反映了气流羽流与所形成的燃烧的燃料残渣之间的相互作用,其排放率主要由燃料消耗率,排放因子和火brand大小的函数决定。类似于不燃烧的风载颗粒的随机分布,顺时针方向上火星的瞬时分布由瑞利形式的统计模式描述。然后,通过在火势蔓延和燃尽过程中的整个影响期内的积分,确定在最大行驶距离内顺风降落的火警棒的数量和质量。该模型在2003年澳大利亚堪培拉发生的森林大火中的应用表明,该模型为顺风向的火星分布提供了合理的预测,并定量显示了炭烬袭击在城市界面房屋大规模破坏中的作用。

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