The effects of humus moisture content on underground fires in a Larix gmelinii plantation
The effects of humus moisture content on underground fires in a Larix gmelinii plantation
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DOI：
10.1007/s11676-021-01377-x
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发表时间：
2021-07
影响因子：
3
通讯作者：
Xiyue Han;Hening Xu;Tiantian Wang;Sainan Yin;Bo Gao;Ya-Jun Wang;Yanlong Shan
中科院分区：
文献类型：
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作者：
Xiyue Han;Hening Xu;Tiantian Wang;Sainan Yin;Bo Gao;Ya-Jun Wang;Yanlong Shan
地下火灾是一种阴燃燃烧，蔓延速度慢，温度低，无火焰。它们可以持续几天到几个月，甚至可以成为越冬的火。它们很难找到，导致对森林造成相当大的破坏。可燃燃料的含水率是地下森林火灾发生和持续的重要因素。大兴安岭是中国地下火灾多发地区。通过室内模拟燃烧实验，研究了不同含水率对地下火灾特性的影响。研究表明，不同湿度下腐殖质的峰值温度和扩散速率波动随腐殖质深度的增加而增加。不同深度腐殖质的峰值温度和扩散速率波动随水分的增加而减小；腐殖质含水率和深度对峰值温度和扩散速率波动有显著影响；不同深度的峰值温度随湿度的增加而降低；上层铺展速率随含水量的增加而增加，下层铺展速率随含水量的增加而降低。
Underground fires are a smoldering combustion with a slow spread rate, low temperatures and no flame. They can last from days to several months, and can even become overwintering fires. They are difficult to find, leading to considerable damage to the forests. The moisture content of combustible fuels is an important factor in the occurrence and persistence of underground forest fires. The Daxing’an Mountains are a hot spot for underground fires in China. This paper looks at the influence of different moisture contents on underground fire characteristics using simulation combustion experiments in the laboratory. The study showed that peak temperature and spread rate fluctuation of humus at different moisture levels increased with humus depth. Peak temperature and spread rate fluctuation of humus at different depths decreased with increased moisture; moisture content and depth of humus had a significant effect on peak temperature and spread rate fluctuation; peak temperature at different depths decreased with increased moisture; the spread rate in upper layers increased with moisture content, while the spread rate in the lower layers decreased with increased moisture content.