The effects of humus moisture content on underground fires in a Larix gmelinii plantation
2022
Han, Xiyue | Xu, Hening | Wang, Tiantian | Yin, Sainan | Gao, Bo | Wang, Yajun | Shan, Yanlong
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.
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