A study on the estimation of threshold of crown fire transition with the slope conditions
As simultaneous and massive forest fires are rapidly increasing along with climate change such as winter abnormally high temperatures, the need for systematic research and development of management technology to reduce fire damage from large-scale forest fires is emerging. Because the main mechanism of large fire is crown fire and spot fire in the coniferous forests vulnerable to forest fires, the understanding of fire behavior must take precedence in order to fire damage reduction. However, fire behavior research has mostly been developed based on empirical knowledge due to limitations in the scale of experimental equipment, which makes research data somewhat less accurate to show the characteristics of fire behavior at actual sites. In this work, we tried to physically observe the characteristics of crown fire behavior accompanying large forest fires through indoor combustion experiments with minimal exposure to environmental variables. Using large wind tunnel equipment, crown fire transition phenomenon from the surface fire was simulated, and the slope conditions and crown base height(CBH) thresholds of crown fire transition under Korean pine forest conditions were presented through items such as spread rate, flame characteristics, mass loss rate, and ignition. According to the results of this study, the rate of fire spread increased as the slope angle increased, the rate of firespread of slope angle 30° was 14 times faster than slope angle 0°. Measured fire intensity ranged from 246.73 kW/m, ~ 2,602.96 kW/m, the fire intensity increased as the slope angle increases. The flame height and flame tilt decreased as the slope angle increased, the length of flame increased as the slope angle increased. The measured combustion rate decreased as the slope angle increased. The moisture content of canopy fuel measured higher as the crown base height increases under the same slope conditions, so the risk of forest fire ignition is determined to below. The results of this study can be used as basic data to fire behavior with the slope conditions. Keywords: crown fire transition, fire behavior, surface fire, crown base height, fuel moisture content ID: 3623685
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| Format: | Article biblioteca |
| Language: | English |
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FAO ;
2022
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| Online Access: | https://openknowledge.fao.org/handle/20.500.14283/CC1185EN http://www.fao.org/3/cc1185en/cc1185en.pdf |
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