Radiant flux density, energy density and fuel consumption in mixed-oak forest surface fires

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Contents Vol 21(6)

doi:10.1071/WF10143

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Radiant flux density, energy density and fuel consumption in mixed-oak forest surface fires

R. L. Kremens ^A ^D, M. B. Dickinson ^B and A. S. Bova ^A ^B ^C

^A Rochester Institute of Technology, Center for Imaging Science, 54 Lomb Memorial Drive, Rochester, NY 14623 USA.
^B US Forest Service Northern Research Station, 359 Main Road, Delaware, OH 43015, USA.
^C Current address: Bova Consulting, 323 Northridge Road, Columbus, OH 43214, USA.
^D Corresponding author. Email: kremens@cis.rit.edu

International Journal of Wildland Fire 21(6) 722-730 http://dx.doi.org/10.1071/WF10143
Submitted: 3 February 2011 Accepted: 16 December 2011 Published: 28 June 2012





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Abstract

Closing the wildland fire heat budget involves characterising the heat source and energy dissipation across the range of variability in fuels and fire behaviour. Meeting this challenge will lay the foundation for predicting direct ecological effects of fires and fire–atmosphere coupling. In this paper, we focus on the relationships between the fire radiation field, as measured from the zenith, fuel consumption and the behaviour of spreading flame fronts. Experiments were conducted in 8 × 8-m outdoor plots using preconditioned wildland fuels characteristic of mixed-oak forests of the eastern United States. Using dual-band radiometers with a field of view of ~18.5 m² at a height of 4.2 m, we found a near-linear increase in fire radiative energy density over a range of fuel consumption between 0.15 and 3.25 kg m^–2. Using an integrated heat budget, we estimate that the fraction of total theoretical combustion energy density radiated from the plot averaged 0.17, the fraction of latent energy transported in the plume averaged 0.08, and the fraction accounted for by the combination of fire convective energy transport and soil heating averaged 0.72. Future work will require, at minimum, instantaneous and time-integrated estimates of energy transported by radiation, convection and soil heating across a range of fuels.

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