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首页> 外文期刊>International Journal of Wildland Fire >Examination of the wind speed limit function in the Rothermel surface fire spread model
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Examination of the wind speed limit function in the Rothermel surface fire spread model

机译：在Rothermel地面火势蔓延模型中检查风速限制功能

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摘要

The Rothermel surface fire spread model includes a wind speed limit, above which predicted rate of spread is constant. Complete derivation of the wind limit as a function of reaction intensity is given, along with an alternate result based on a changed assumption. Evidence indicates that both the original and the revised wind limits are too restrictive. Wind limit is based in part on data collected on the 7 February 1967 Tasmanian grassland fires. A reanalysis of the data indicates that these fires might not have been spreading in fully cured continuous grasslands, as assumed. In addition, more recent grassfire data do not support the wind speed limit. The authors recommend that, in place of the current wind limit, rate of spread be limited to effective midflame wind speed. The Rothermel model is the foundation of many wildland fire modelling systems. Imposition of the wind limit can significantly affect results and potentially influence fire and fuel management decisions.
机译：Rothermel地面火势蔓延模型包括一个风速极限，高于该极限时，预计的蔓延速率是恒定的。给出了作为反应强度的函数的风极限的完全推导，以及基于变化假设的替代结果。有证据表明，原始的和修改后的风向限制都过于严格。风力极限部分基于1967年2月7日塔斯马尼亚草原大火收集的数据。对数据的重新分析表明，如假定的那样，这些大火可能没有在完全固化的连续草原上蔓延。此外，最近的草火数据不支持风速限制。作者建议，代替当前的风速限制，将扩散速度限制为有效的中焰风速。 Rothermel模型是许多野外火灾建模系统的基础。施加风速限制会严重影响结果，并可能影响火警和燃料管理决策。

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