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fire spreading
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  fire spreading
The time to ignition of a second object and fire spreading distances were estimated from post-visual observations and temperature measurements.
      
Full-scale hot smoke tests are then performed to study the cabin fire spreading to large-space building at different air change rates (ACH).
      
The time scales for tree growth and for forest cluster burning down are quite separated, so the fire spreading process finished in a time step.
      
The fire spreading rates also depend largely on biomass composition.
      
The crucial fact may be that most mechanisms for fire spreading lead to expanding fronts.
      
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Dicranopteris is the plant indicator for acid soils.They grow profusely on the land of the thirteen provinces situating in the south of the Yangtze River They are very resistant to environmental stress.They grow profusely and soon spread all over the hilly districts.They occupied almost the same area as cultivated lands.They are of very little economic value,and on the contrary do a lot of damage.Dicranopteris catches fire easily in dry season and the fire spreads to destroy the forest.So it...

Dicranopteris is the plant indicator for acid soils.They grow profusely on the land of the thirteen provinces situating in the south of the Yangtze River They are very resistant to environmental stress.They grow profusely and soon spread all over the hilly districts.They occupied almost the same area as cultivated lands.They are of very little economic value,and on the contrary do a lot of damage.Dicranopteris catches fire easily in dry season and the fire spreads to destroy the forest.So it is important to remove them by burning and replanting the forage grasses.The aboriginal forage grasses grow quickly and take only one season to flourish the forage land with the Dicranopteris entirely destroyed.This method is convenient and economical,and is quick in obtaining results.So far as we know,this is the best way for eradicating successfully indivisible Dicranopteris on the lands to the South of the Yangtze River,also preventing soil erosion in the hilly regions.Such is the way well recommended for extension.

芒箕骨是酸性土指示植物,繁殖快,抗逆性强。芒箕骨草在我国长江以南13个省、市、自治区的山区和丘陵地带所占的面积几乎与耕地相等;在我省约占山丘总面积的60%左右,在闽西北、闽中红壤山区中占地达70~80%。目前,其经济价值除少量可入药外,仅能作为农家燃料,经济产值甚微。同时,芒箕骨草易引起火烧山。实有改造的必要。根据芒箕骨生长的特点,本文提出改造的方法。先采用烧、垦办法,予以清除;再用植物种间竞争以草制草综合治理,抑制其生产,一季即可将芒箕骨草山改造成人工草场。这种方法,经济简便,收效较快,是改造芒箕骨草山的一种创举,也是防止山区水土流失的一种办法,值得推广。

On the basis of 35 sets of fire spread data, taken from prescribed burning of grassland for constructing firebreaks in Greatxingan Mountains, the effects of wind speed, fuel moisture content, air temperature, relative humidity, and dry weight of biomass on fire spread were analysed using multiple liner regression. A simple model, R=0.3370+0.9660V-0.0052M, based on wind speed (V) and fuel moisture content(M) was developed for predicting rate of grassland fire forward spread(m/s). It is...

On the basis of 35 sets of fire spread data, taken from prescribed burning of grassland for constructing firebreaks in Greatxingan Mountains, the effects of wind speed, fuel moisture content, air temperature, relative humidity, and dry weight of biomass on fire spread were analysed using multiple liner regression. A simple model, R=0.3370+0.9660V-0.0052M, based on wind speed (V) and fuel moisture content(M) was developed for predicting rate of grassland fire forward spread(m/s). It is recommended to be used in planning prescribed fire and controlling and managing wildfira on grassland in forest areas.

根据1981~1983年在大兴安岭地区测得的草塘沟火烧试验数据,对影响草甸火蔓延的几个重要因子(风速、可燃物含水率、大气温度、相对湿度和可燃物干重量)进行了多元线性回归分析。分析结果表明,风速(V)和可燃物含水率(M)对火蔓延起决定性作用。据此,利用该二项因子V和M进行了二元线性回归,建立草甸火顺风蔓延速度预测模型:R=0.3370+0.0660V-0.0052M。复相关系数R_0=0.818。此模型可为大兴安岭林区火烧防火线安全用火,合理调配点火与扑火力量提供科学参考依据。

Based on the research of the Forest Burning Links published in thc Journal of Northeast Forestry University in 1987, this paper continues to study thc theory of forest burning. Fire behaviour has been divided into two important parts in this paper. One is the combustibility and fire spread, and the other is the fire intensity. The combustibility and fire spread have been divided into three grades as the following: A: to burn difficultly and spread slowly; B: to burn possibly and...

Based on the research of the Forest Burning Links published in thc Journal of Northeast Forestry University in 1987, this paper continues to study thc theory of forest burning. Fire behaviour has been divided into two important parts in this paper. One is the combustibility and fire spread, and the other is the fire intensity. The combustibility and fire spread have been divided into three grades as the following: A: to burn difficultly and spread slowly; B: to burn possibly and burn in middle degree; C: to burn easily and spread fast. The burning degrees of fire have been divided into four as the following: Ⅰ: light burning; Ⅱ: medium burning; Ⅲ: intense burning; Ⅳ: severe burning. The part of combustibility and fire spread can be put as ordinate and the post of fire intensity can be put as abscissa. Then the network of forest burning links has been formed by twelvc forest burning links. In the network, the relationship, the law of distribution and the variation of different forest burning links can be shown clearly. The studies of the distribution and effect of fuel types, topography, site and fire kinds in the network can provide the basic theory for fire management.

本文在森林燃烧环研究的基础上,将林火行为的两大主要特征(着火蔓延和燃烧强度)分为不同的等级,即着火蔓延序列分为A:难燃、蔓延缓慢;B:可燃、蔓延中等;C:易燃、蔓延快三级,把燃烧强度序列分为Ⅰ:轻度燃烧;Ⅱ:中度燃烧;Ⅲ高度燃烧;Ⅳ:强度燃烧四级,然后以着火蔓延序列为纵向,以燃烧强度序列为横向,构成森林燃烧环网,以此来研究各燃烧环之间的相互关系,分布规律及变型,影响森林燃烧的主要因子是可燃物类型、地形、立地条件、可燃物数量和火灾种类,研究它们在环网上的分布和作用,可为林火管理和估测各燃烧环的火行为特征提供依据。

 
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