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Fuel Moisture Thresholds in the Flammability of Calluna vulgaris

机译:寻常型Calluna易燃性中的燃料水分阈值

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摘要

Managed and wild fires play a significant role in the ecology of heathlands in the UK but we currently have little ability to forecast fire behaviour or the likelihood of accidental wildfires. Like many shrubland fuel types, heathlands display significant structural complexity and the role of different fuel components in governing flammability has not been clear. Using a series of small, field-based ignition tests, we demonstrate the critical importance of the moisture content of dead fine fuels in the lower canopy for determining when sustaining fires in the vegetation canopy can develop. At moisture contents above c. 70% both spot and line ignitions failed but where moisture contents were less than c. 60% fires developed rapidly. The initial rate of spread of successful ignitions was primarily controlled by the moisture content of the lower canopy and the moss/litter layer. Models that predict the moisture content of elevated dead fuels and the moss litter layer are urgently needed in order to protect heathlands from wildfire and to allow forecasts of the suitability of conditions for prescribed burning to be developed.
机译:人工林和野火在英国的荒地生态中起着重要作用,但我们目前尚无能力预测火灾行为或意外野火的可能性。与许多灌木丛燃料类型一样,石南丛生草显示出显着的结构复杂性,并且不清楚各种燃料成分在控制可燃性中的作用。通过一系列基于现场的小型点火测试,我们证明了较低的机盖中死微细燃料的水分含量对于确定何时可以在植被的机盖中产生持续的火灾至关重要。水分含量高于c。 70%的点点火和管道点火均失败,但水分含量低于c。 60%的火灾迅速发展。成功点火的初始扩散速率主要由下部冠层和苔藓/垃圾层的水分含量控制。为了保护荒地免于野火,并允许对指定燃烧条件的适用性进行预测,迫切需要能够预测升高的死燃料和苔藓凋落物的水分含量的模型。

著录项

  • 来源
    《Fire Technology》 |2011年第2期|p.421-436|共16页
  • 作者

    G.Matt Davies; Colin J.Legg;

  • 作者单位

    Centre for the Study of Environmental Change and Sustainability, School of GeoSciences, The University of Edinburgh, Crew Building, King's Buildings, West Mains Road, Edinburgh EH9 3JN, UK,School of Forest Resources, University of Washington, Merrill Hall, Box 354115, Seattle, WA 98195-4115, USA;

    Centre for the Study of Environmental Change and Sustainability, School of GeoSciences, The University of Edinburgh, Crew Building, King's Buildings, West Mains Road, Edinburgh EH9 3JN, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    fire behaviour; fire sustainability; heathland; ignition; logistic regression; managed burning; rate of spread; wildfire;

    机译:火行为防火可持续性;荒地点火;逻辑回归管理燃烧;传播速度;野火;
  • 入库时间 2022-08-18 00:12:59

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