Figure 2 - uploaded by Bryan Quaife
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Visual (top) and infrared (bottom) camera frames at four time steps spaced approximately 10 s apart. The frames of the individual cameras are not perfectly synchronized.
Source publication
Most wildland and prescribed fire spread occurs through ground fuels, and the rate of spread (RoS) in such environments is often summarized with empirical models that assume uniform environmental conditions and produce a unique RoS. On the other hand, representing the effects of local, small-scale variations of fuel and wind experienced in the fiel...
Contexts in source publication
Context 1
... sampled at approximately 10 s intervals from the visual and infrared videos are shown in Figure 2. In the visual images, the black, apparently burnt areas are still undergoing combustion underneath a superficial char layer. ...
Context 2
... IR camera reveals these high temperatures of the fuel surface and hot gases emanating from the combustion layer. Note that the remnant charred fuels in Figure 2 have attained their maximum surficial temperature and have only just begun cooling according to their temperature time series. ...
Citations
... Changes in these parameters directly affect the transfer of gaseous combustion products, smoke, and aerosol. Research in this area is carried out using both experimental methods [17,[19][20][21][22] and mathematical models [23][24][25]. ...
The article is concerned with the experimental study of the crown fire effect on atmospheric transport processes: the formation of induced turbulence in the vicinity of the fire source and the transport of aerosol combustion products in the atmosphere surface layer at low altitudes. The studies were carried out in seminatural conditions on the reconstructed forest canopy. It was established that the structural characteristics of fluctuations of some atmosphere physical parameters in the case of a crown fire practically coincide with the obtained earlier values for a steppe fire. The highest concentration of aerosol combustion products was recorded at a height of 10–20 m from the ground surface. It was found that the largest number of aerosol particles formed during a crown fire had a particle diameter of 0.3 to 0.5 µm. As a result of experimental data extrapolation, it is concluded that an excess of aerosol concentration over the background value will be recorded at a distance of up to 2000 m for a given volume of burnt vegetation. It is of interest to further study these factors of the impact of wildfires on atmosphere under the conditions of a real large natural wildfire and determine the limiting distance of aerosol concentration excesses over background values.
