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首页> 外文期刊>Natural hazards and earth system sciences >Resolving vorticity-driven lateral fire spread using the WRF-Fire coupled atmosphere-fire numerical model
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Resolving vorticity-driven lateral fire spread using the WRF-Fire coupled atmosphere-fire numerical model

机译：使用WRF-火耦合大气-火数值模型解决由涡度引起的横向火势蔓延

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Vorticity-driven lateral fire spread (VLS) is a form of dynamic fire behaviour, during which a wildland fire spreads rapidly across a steep leeward slope in a direction approximately transverse to the background winds. VLS is often accompanied by a downwind extension of the active flaming region and intense pyro-convection. In this study, the WRF-Fire (WRF stands for Weather Research and Forecasting) coupled atmosphere-fire model is used to examine the sensitivity of resolving VLS to both the horizontal and vertical grid spacing, and the fire-to-atmosphere coupling from within the model framework. The atmospheric horizontal and vertical grid spacing are varied between 25 and 90m, and the fire-to-atmosphere coupling is either enabled or disabled. At high spatial resolutions, the inclusion of fire-to-atmosphere coupling increases the upslope and lateral rate of spread by factors of up to 2.7 and 9.5, respectively. This increase in the upslope and lateral rate of spread diminishes at coarser spatial resolutions, and VLS is not modelled for a horizontal and vertical grid spacing of 90 m. The lateral fire spread is driven by fire whirls formed due to an interaction between the background winds and the vertical circulation generated at the flank of the fire front as part of the pyro-convective updraft. The laterally advancing fire fronts become the dominant contributors to the extreme pyro-convection. The results presented in this study demonstrate that both high spatial resolution and two-way atmosphere-fire coupling are required to model VLS with WRF-Fire.
机译：涡度驱动的横向火势蔓延（VLS）是动态火势的一种形式，在此过程中，野火在陡峭的背风斜坡上以与背景风垂直的方向迅速蔓延。 VLS通常伴随着活动火焰区域的顺风扩展和强烈的热对流。在这项研究中，WRF-Fire（WRF代表天气研究和预报）耦合的大气-火模型用于检验解析VLS对水平和垂直网格间距的敏感度，以及从内部进行火-气耦合模型框架。大气水平和垂直网格间距在25至90m之间变化，并且火对大气耦合已启用或禁用。在高空间分辨率下，火气耦合的加入分别使上升和横向扩展速率分别增加了2.7和9.5倍。在较粗的空间分辨率下，上坡和横向扩展速率的增加减小，并且对于水平和垂直网格间距为90 m，未对VLS进行建模。横向火势的蔓延是由火旋涡驱动的，火旋涡是由于背景风和作为热对流上升气流一部分在火锋侧面产生的垂直循环之间的相互作用而形成的。横向前进的火锋成为极端热对流的主要因素。这项研究中提出的结果表明，使用WRF-Fire建模VLS既需要高空间分辨率，又需要双向大气-火耦合。

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