Investigation of the effects of interactions of intersecting oblique fire lines with and without wind in a combustion wind tunnel
Andrew L. Sullivan
A D , William Swedosh B , Richard J. Hurley A , Jason J. Sharples C and James E. Hilton B
+ Author Affiliations
- Author Affiliations
A CSIRO, GPO Box 1700, Canberra, ACT 2601, Australia.
B CSIRO Data61, Private Bag 10, Clayton South, Vic. 3169, Australia.
C University of New South Wales Canberra, PO Box 7916, Canberra BC, ACT 2610, Australia.
D Corresponding author. Email: andrew.sullivan@csiro.au
International Journal of Wildland Fire 28(9) 704-719 https://doi.org/10.1071/WF18217
Submitted: 4 December 2018 Accepted: 20 June 2019 Published: 6 August 2019
Abstract
Quantification of the interaction of intersecting and non-intersecting fire perimeters over a range of shapes, sizes and orientations is essential to understanding the behaviour of high-intensity wildfires that have become discontiguous as a result of spot fires or effects of broken topography or fuels. One key configuration is that of the V-shaped fire where two individual lines of fire intersect at oblique angles. Previous work under calm conditions in pine needle litter and straw found the speed of propagation of the vertex of the intersection to increase non-linearly as the angle of intersection decreased. The present paper investigates this relation in dry eucalypt forest litter in both the absence and presence of wind (~1.0 m s−1) and found that the increase in vertex speed under calm conditions was no greater than would be expected due to the geometry of the configuration. Conversely, in the presence of wind, the increase in the vertex propagation speed was substantially greater than explained by the geometry alone. Although these results suggest that fire line interactions can influence the behaviour and spread of coalescing fire fronts, further research is required to both identify the precise mechanisms driving this behaviour and quantify the resultant effects.
Additional keywords: experiment, fire behaviour, fire spread, laboratory, Pyrotron, rate of spread, spot fire, wildfire.
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