坡度对林火蔓延的影响  

Influences of Slope on Forest Fire Spread

作　　者：朱家进[1] 周汝良[1] 高仲亮[1] 龙腾腾[1] 施绍军[1] 徐博达[1] 

机构地区：[1]西南林业大学土木工程学院,云南昆明650224

出　　处：《农业灾害研究》2012年第4期80-83,共4页Journal of Agricultural Catastrophology

基　　金：云南省教育厅大学生科技创新项目(50106010);云南省教育厅科学研究基金项目(2011C133);云南省重点学科"森林保护学"项目(XKZ200905)

摘　　要：选取云南省安宁市林地为标准样地,室内完成林下可燃物含水率测定和林火蔓延模拟试验。以不同坡度采集的样本在相对应的坡度上进行燃烧试验,在火焰边缘5cm处采集辐射热,在燃烧床以平均10cm处记录燃烧时间,采用红外手持温度仪来回扫描,记录显示的最高温度。结果表明,随着坡度的增加,辐射热增加,燃烧时间减少,火焰高度增高,燃烧区温度增高,林火蔓延速度加快。Woodland in Anning City of Yunnan Province was taken as the standard plot, moisture capacity of underwood inflammable materials was measured and forest fire spread simulation experiment was carried out in laboratory. Samples were taken from different slopes and burning tests carried out on the corresponding slopes, radiant heat collected 5 cm away from the flame fringe, burning time recorded at the points 10 cm on average from the burn- ing bed, portable infrared thermometer used and the highest temperatures recorded. The results showed that radiant heat increased with the increasing slope, but burning time declined, flame height increased, temperature in the burning area rose, and forest fire spread faster.

关 键 词：林火蔓延 坡度 辐射热 温度 蔓延速度 火焰高度 

分 类 号：S762[农业科学—森林保护学]