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Journal of the International Association of Wildland Fire
RESEARCH ARTICLE

Firebrand characteristics of the stringy bark of messmate (Eucalyptus obliqua) investigated using non-tethered samples

P. F. M. Ellis
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CSIRO Ecosystem Sciences and CSIRO Climate Adaptation Flagship GPO Box 1700, Canberra, ACT 2601, Australia. Email: peter.ellis@csiro.au

International Journal of Wildland Fire 22(5) 642-651 https://doi.org/10.1071/WF12141
Submitted: 24 August 2012  Accepted: 6 November 2012   Published: 29 January 2013

Abstract

The fragile, fibrous bark of messmate (Eucalyptus obliqua) has been implicated in Victorian bushfires in which significant loss of life and property occurred. The airflow of a vertical wind tunnel was modified in order to allow the observation of non-tethered samples. The duration of flaming combustion (flameout time) and total combustion time during flight (burnout time), and mass at burnout, were measured for 192 samples between 0.4 and 8.3 g, and impact with the walls subjectively categorised. Of 146 samples not significantly affected by impact, 55 had flameout times between 30 and 70 s (maximum 75 s) and 131 had burnout times ≤180 s (maximum 420 s). Eleven samples had significantly longer burnout times apparently because combustion occurred internally or from one end, and 18 reflamed during their latter, glowing phase, one more than 4 min after ignition. This in-flight combustion behaviour, and the quantities of loosely attached, weathered flakes on long-unburnt trunks, is consistent with the species notoriety for intense spotting to distances of a few kilometres. Modification of wind tunnel airflow in order to study non-tethered firebrands and sample reflaming during flight has not been previously reported.


References

Almeida M, Viegas DX, Miranda AI, Reva V (2011) Effect of particle orientation and flow velocity on the combustibility of Pinus pinaster and Eucalyptus globulus firebrand material. International Journal of Wildland Fire 20, 946–962.
Effect of particle orientation and flow velocity on the combustibility of Pinus pinaster and Eucalyptus globulus firebrand material.Crossref | GoogleScholarGoogle Scholar |

Borgor GG (1976) The optimisation of wind tunnel contractions for the subsonic range. National Aeronautical and Space Administration, Technical Translation NASA TT F-16899. (Washington, DC) [Translation of ‘Optimierung von Windkanalduesen fur den Unterschallbereich’, Ruhr-Universitat, Fakultat fur Maschinebau und Konstructiven Ingenieurbau, PhD dissertation, 1973.]

Cheney NP, Bary GAV (1969) The propagation of mass conflagrations in a standing eucalypt forest by the spotting process. In ‘Mass Fire Symposium’, 10–12 February 1969, Canberra, ACT. Paper A6. (Defence Standards Laboratories: Melbourne)

Clements HB (1977) Lift-off of forest firebrands. USDA Forest Service, Southeastern Forest Experiment Station, Research Paper SE-159. (Ashville, NC)

Clogg CC, Petkova E, Haritou A (1995) Statistical methods for comparing regression coefficients between models. American Journal of Sociology 100, 1261–1293.
Statistical methods for comparing regression coefficients between models.Crossref | GoogleScholarGoogle Scholar |

Cruz MG, Sullivan AL, Gould JS, Sims NC, Bannister AJ, Hollis JJ, Hurley RJ (2012) The anatomy of a catastrophic wildfire: the Black Saturday Kilmore East fire in Victoria, Australia. Forest Ecology and Management 284, 269–285.
The anatomy of a catastrophic wildfire: the Black Saturday Kilmore East fire in Victoria, Australia.Crossref | GoogleScholarGoogle Scholar |

Ellis PF (2000) The aerodynamic and combustion characteristics of eucalypt bark – a firebrand study. PhD thesis, Australian National University.

Ellis PFM (2010) The effect of aerodynamic behaviour of flakes of jarrah and karri bark on their potential behaviour as firebrands. Journal of the Royal Society of Western Australia 93, 21–27.

Ellis PFM (2011) Fuelbed ignition potential and bark morphology explain the notoriety of the eucalypt messmate ‘stringybark’ for intense spotting. International Journal of Wildland Fire 20, 897–907.
Fuelbed ignition potential and bark morphology explain the notoriety of the eucalypt messmate ‘stringybark’ for intense spotting.Crossref | GoogleScholarGoogle Scholar |

Ganteaume A, Lampin-Maillet C, Guijarro M, Hernando C, Jappiot M, Fonturbel T, Pérez-Gorostiaga P, Vega JA (2009) Spot fires: fuel bed flammability and capability of firebrands to ignite fuel beds. International Journal of Wildland Fire 18, 951–969.
Spot fires: fuel bed flammability and capability of firebrands to ignite fuel beds.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1MXhsFaqtLzO&md5=ba0faa6f83eb77fbcbffe952e9adc603CAS |

Hodgson A (1968) Control burning in eucalypt forests in Victoria, Australia. Journal of Forestry 66, 601–605.

Knight IK (2001) The design and construction of a vertical wind tunnel for the study of untethered firebrands in flight. Fire Technology 37, 87–100.
The design and construction of a vertical wind tunnel for the study of untethered firebrands in flight.Crossref | GoogleScholarGoogle Scholar |

Knight IK, Ellis PFM, Sullivan AL (2001) The CSIRO vertical wind tunnel. CSIRO Forestry and Forest Products, Technical Report Number 133. (Yarralumla, ACT)

Lee SL, Hellman JM (1969) Study of firebrand trajectories in a turbulent swirling natural convection plume. Combustion and Flame 13, 645–655.
Study of firebrand trajectories in a turbulent swirling natural convection plume.Crossref | GoogleScholarGoogle Scholar |

Luke RH, McArthur AG (1978) ‘Bushfires in Australia.’ (CSIRO Division of Forest Research, Australian Government Printing Service: Canberra)

McArthur AG (1967) Fire behaviour in eucalypt forests. Commonwealth of Australia, Forestry and Timber Bureau, Leaflet Number 107. (Canberra, ACT)

McArthur AG (1969) The Tasmanian bushfires of 7th February, 1967, and associated fire behaviour characteristics. In ‘Mass Fire Symposium’, 10–12 February 1969, Canberra, ACT. Paper A7. (Defence Standards Laboratories: Melbourne)

Mehta RD, Bradshaw P (1979) Design rules for small, low speed wind tunnels. Aeronautical Journal 83, 443–449.

Morgan PG (1960) The stability of flow through porous screens. Journal of the Royal Aeronautical Society 64, 359–362.

Muraszew A (1974) Firebrand phenomena. The Aerospace Corporation, Aerospace Report ATR-74(8165–01)-1. (El Segundo, CA)

Muraszew A, Fedele JB (1976) Statistical model for spot fire hazard. The Aerospace Corporation, Aerospace Report ATR-77(7588)-1. (El Segundo, CA)

Muraszew A, Fedele JB, Kuby WC (1975) Firebrand investigation. The Aerospace Corporation, Aerospace Report ATR-75(7470)-1. (El Segundo, CA)

Muraszew A, Fedele JB, Kuby WC (1976) Investigation of fire whirls and firebrands. The Aerospace Corporation, Aerospace Report ATR-76(7509)-1. (El Segundo, CA)

R Core Development Team (2011) The R Project for Statistical Computing, Version 2.13.2. Available at www.r-project.org [Verified 30 September 2011]

Rawson RP, Billing PR, Duncan SF (1983) The 1982–83 forest fires in Victoria. Australian Forestry 46, 163–172.

Sullivan AL, Ball R (2012) Thermal decomposition and combustion chemistry of cellulosic biomass. Atmospheric Environment 47, 133–141.
Thermal decomposition and combustion chemistry of cellulosic biomass.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3MXhs1KrtbzI&md5=a60d0b6abe012a3a2fdecfa7c3fc3e28CAS |

Tarifa CS, del Notario PP, Moreno FG (1965) On the flight paths and lifetimes of burning particles of wood. Symposium (International) on Combustion 10, 1021–1037.
On the flight paths and lifetimes of burning particles of wood.Crossref | GoogleScholarGoogle Scholar |

Tarifa CS, del Notario PP, Moreno FG, Villa AR (1967) Transport and Combustion of Firebrands. Aeronautical Institute of Madrid for USDA, Final Report of Grants FG-SP-114 and FG-SP 146

Teague B, McLeod R, Pascoe S (2009) Fire Behaviour. In ‘Victorian Bushfires Royal Commission – Interim Report’. State Government of Victoria, pp. 45–82. (Melbourne)

Tolhurst KG, Flinn DW, Loyn RH, Wilson AAG, Foletta IJ (1992) Ecological effect of fuel reduction burning in a dry sclerophyll forest: a summary of principal research findings and their management implications. Department of Conservation and Environment. Victoria. (Melbourne)

Wilson AAG (1992) Eucalypt Bark Hazard Guide. Department of Conservation and Environment. Victoria, Fire Management Branch, Research Report Number 32. (Melbourne)

Woycheese JP (2000) Brand lofting and propagation from large-scale fires. PhD dissertation, University of California, Berkeley.

Woycheese JP (2001) Wooden disk combustion for spotfire spread. In ‘The Ninth International Fire Science and Engineering Conference (INTERFLAM)’, 17–19 September 2001, Edinburgh, Scotland. pp. 101–112. (Interscience Communications: London, UK)