Effect of Small-Scale Wildfires on the Air Parameters near the Burning Centers

Atmosphere

Pavel Martynov¹  Konstantin Orlov¹  Veronika Tarakanova¹  Egor Loboda¹  Kirill Savin¹  Andrey Dutov¹  Denis Kasymov¹  Yuliya Loboda¹  Mikhail Agafontsev¹  Yevgeniy Gordeev²  Vladimir Reyno² 

[1] Department of Physical and Computational Mechanics, National Research Tomsk State University, 634050 Tomsk, Russia;Laboratory of Wave Propagation, E. Zuev Institute of Atmospheric Optics of the Siberian Branch of the Russian Academy of Science, 634055 Tomsk, Russia;

关键词: wildfire;    atmosphere;    IR thermography;    combustion;    turbulence;   

DOI  :  10.3390/atmos12010075

来源: DOAJ

【 摘 要 】

The results of seminatural experiments on the study of steppe and field wildfires characteristic of the steppe and forest-steppe zones of Western Siberia are presented. Using infrared (IR) thermography methods, the main thermal characteristics of the fire front are derived, the flame turbulence scale is estimated, and changes in the structure function of the air refractive index are analyzed in the vicinity of a fire. The effect of a model fire on the change of meteorological parameters (wind velocity components, relative air humidity, and temperature) is ascertained. Large-scale turbulence is observed in the front of a seminatural fire, which is absent in laboratory conditions. The predominance of large-scale turbulence in a flame results in turbulization of the atmosphere in the vicinity of a combustion center. Strong heat release in the combustion zone and flame turbulence increase the vertical component of the wind velocity and produce fluctuations in the air refractive index, which is an indicator of atmospheric turbulization. This creates prerequisites for the formation of a proper wind during large fires. Variations in the gas and aerosol compositions of the atmosphere are measured in the vicinity of the experimental site.

【 授权许可】

Unknown