2019 Wildfire Conference. Adressing the Challenges of Bushfire Management
Presentations Notes 2019: DAY 1 (Day 2 - Wednesday Nov. 13th, 2019).
The role of fire geometry in the development of violent pyroconvectio.
R. L. Badlan and J. J. Sharples (Applied and Industrial Mathematics Group, School of Science, UNSW Canberra)
J. E. Evans (Climate Science Research Centre, UNSW, Sydney)
R. H. D. McRaez (Australian Capital Territory Emergency Services Agency, Canberra)
Violent ﬁre-driven convection can manifest as towering pyrocumulus or pyrocumulonimbus clouds, which spread erratically and are not generally suppressible. Their occurrence is increasing and they impact both the environment and society. Research into violent pyroconvection has mainly focused on the atmospheric processes, or on surface ﬁre weather and associated fuel conditions, with comparatively less attention paid to the role of the ﬁre itself in these coupled ﬁre-atmosphere events. This paper draws upon recent insights into dynamic ﬁre propagation and extreme wildﬁre development to investigate how the geometry of the ﬁre inﬂuences the occurrence of violent pyroconvective events.
The analyses indicate that geometry of the ﬁres can be critical in driving the development of pyroconvective plumes, and uses the ratio of the ﬁre perimeter to area, as a useful metric for both solid and annular ﬁres. This ﬁnding may provide the potential to improve forecasting of blow up ﬁre events.