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International Journal of Wildland Fire International Journal of Wildland Fire Society
Journal of the International Association of Wildland Fire
RESEARCH ARTICLE

Behaviour of slope and wind backing fires

Carlos G. Rossa A C D , David A. Davim A and Domingos X. Viegas A B
+ Author Affiliations
- Author Affiliations

A Associação para o Desenvolvimento da Aerodinâmica Industrial (ADAI)/Laboratório Associado de Energia, Transportes e Aeronáutica (LAETA), Rua Pedro Hispano 12, 3030-289 Coimbra, Portugal.

B Department of Mechanical Engineering, University of Coimbra, Rua Luís Reis dos Santos, 3030-788 Coimbra, Portugal.

C Present address: Centre for the Research and Technology of Agro-environmental and Biological Sciences (CITAB), University of Trás-os-Montes and Alto Douro, Apartado 1013, 5001-801 Vila Real, Portugal.

D Corresponding author. Email: carlos.g.rossa@gmail.com

International Journal of Wildland Fire 24(8) 1085-1097 https://doi.org/10.1071/WF14215
Submitted: 19 April 2013  Accepted: 3 August 2015   Published: 19 November 2015

Abstract

Laboratory experiments of backing fires with slope (–60 to 0°) and wind (–4.5 to 0 m s–1) were carried out in fuel beds of dead Pinus pinaster Ait. needles and straw at a 0.6-kg m–2 fuel load, evaluating rates of spread and flame geometry. Wind velocity measurements inside and above the fuel beds were also carried out. Increase in fuel moisture content decreased the ratio between downslope and level-ground rates of spread (ROS). The ROS decrease with slope angle followed by an increase agreed well with flame geometry data that provided an estimation of the amount of radiation reaching the fuel bed. Features of slope backing fire behaviour could be reasonably estimated based on no-slope fire spread rate. Evidence was found that fuel moisture influenced the ROS of backing fires with wind, despite with an effect opposite to that of slope. Reduced penetration of air into the fuel beds explains the small ROS variation and results suggest that for an increasingly deep fuel bed, the mean ROS tends asymptotically to the no-wind ROS.

Additional keywords: flame geometry, rate of spread, wind inside and above fuel bed.


References

Albini FA, Baughman RG (1979) Estimating wind speeds for predicting wildland fire behavior. USDA Forest Service, Intermountain Forest and Range Experiment Station, Research Paper INT-221. (Ogden, UT)

Almeida MB (2005) Caracterização da combustibilidade de leitos florestais heterogéneos. MSc thesis, Department of Environment and Planning, University of Aveiro, Portugal. [In Portuguese]

Anderson HE (1968) Fire spread and flame shape. Fire Technology 4, 51–58.
Fire spread and flame shape.Crossref | GoogleScholarGoogle Scholar |

Anderson HE (1969) Heat transfer and fire spread. USDA Forest Service, Intermountain Forest and Range Experiment Station, Research Paper INT-69. (Ogden, UT)

Anderson WR, Cruz MG, Fernandes PM, McCaw L, Vega JA, Bradstock R, Fogarty L, Gould J, McCarthy G, Marsden-Smedley JB, Matthews S, Mattingley G, Pearce G, Van Wilgen B (2015) A generic, empirical-based model for predicting rate of fire spread in shrublands. International Journal of Wildland Fire 24, 443–460.
A generic, empirical-based model for predicting rate of fire spread in shrublands.Crossref | GoogleScholarGoogle Scholar |

Balbi JH, Rossi JL, Marcelli T, Chatelon FJ (2010) Physical modelling of surface fire under non-parallel wind and slope conditions. Combustion Science and Technology 182, 922–939.
Physical modelling of surface fire under non-parallel wind and slope conditions.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3cXosFCrtrs%3D&md5=13ef339a458aa60ec8a7b2b66ac57808CAS |

Beaufait WR (1965) Characteristics of backfires and headfires in a pine needle fuel bed. USDA Forest Service, Intermountain Forest and Range Experiment Station, Research Paper INT-39. (Ogden, UT)

Boboulos M, Purvis MR (2009) Wind and slope effects on ROS during the fire propagation in east-Mediterranean pine forest litter. Fire Safety Journal 44, 764–769.
Wind and slope effects on ROS during the fire propagation in east-Mediterranean pine forest litter.Crossref | GoogleScholarGoogle Scholar |

Butler BW, Anderson WR, Catchpole EA (2007) Influence of slope on fire spread rate. In ‘The fire environment: innovations, management, and policy’, 26–30 March 2007, Destin, FL. (Comps BW Butler, W Cook) pp. 75–82. USDA Forest Service, Rocky Mountain Research Station, Proceedings RMRS-P-46CD. (Fort Collins, CO)

Çengel YA (2003) ‘Heat transfer: a practical approach’, 2nd edn. (McGraw-Hill: New York, NY)

Cheney NP (1981) Fire behaviour. In ‘Fire and the Australian biota’. (Eds AM Gill, RH Groves, IR Noble) pp. 151–175. (Australian Academy of Science: Canberra, ACT)

Cheney NP, Gould JS, Catchpole WR (1998) Prediction of fire spread in grasslands. International Journal of Wildland Fire 8, 1–13.
Prediction of fire spread in grasslands.Crossref | GoogleScholarGoogle Scholar |

Cruz MG, McCaw WL, Anderson WR, Gould JS (2013) Fire behaviour modelling in semi-arid mallee-heath shrublands of southern Australia. Environmental Modelling & Software 40, 21–34.
Fire behaviour modelling in semi-arid mallee-heath shrublands of southern Australia.Crossref | GoogleScholarGoogle Scholar |

Dupuy JL (1995) Slope and fuel load effects on fire behaviour. International Journal of Wildland Fire 5, 153–164.
Slope and fuel load effects on fire behaviour.Crossref | GoogleScholarGoogle Scholar |

Dupuy JL, Maréchal J, Portier D, Valette JC (2011) The effects of slope and fuel bed width on laboratory fire behaviour. International Journal of Wildland Fire 20, 272–288.
The effects of slope and fuel bed width on laboratory fire behaviour.Crossref | GoogleScholarGoogle Scholar |

Fernandes PM, Botelho HS, Rego FC, Loureiro C (2009) Empirical modelling of surface fire behaviour in maritime pine stands. International Journal of Wildland Fire 18, 698–710.
Empirical modelling of surface fire behaviour in maritime pine stands.Crossref | GoogleScholarGoogle Scholar |

Gonçalves JC (2000) Experiências de propagação de frentes de fogo em leitos porosos homogéneos e inclinados. MSc thesis, Department of Mechanical Engineering, University of Coimbra, Portugal. [In Portuguese]

Kobayashi C, Tamai K, Hattori S, Nishiyama Y (1991) The spread rate of forest fires: influence of degree of slope and forest floor fuels. Journal of the Japanese Forestry Society 73, 73–77. . [In Japanese]

Luke RH, McArthur AG (1978) ‘Bushfires in Australia.’ (Australian Forestry and Timber Bureau: Canberra, ACT)

McArthur AG (1962) Control burning in eucalypt forests. Australian Forestry and Timber Bureau, Leaflet No. 80. (Canberra, ACT).

McArthur AG (1967) Fire behaviour in eucalypt forests. Australian Forestry and Timber Bureau, Leaflet No. 107. (Canberra, ACT)

Mendes-Lopes JM, Ventura JM, Amaral JM (2003) Flame characteristics, temperature–time curves, and rate of spread in fires propagating in a bed of Pinus pinaster needles. International Journal of Wildland Fire 12, 67–84.
Flame characteristics, temperature–time curves, and rate of spread in fires propagating in a bed of Pinus pinaster needles.Crossref | GoogleScholarGoogle Scholar |

Quinn GR, Keough MJ (2002) ‘Experimental design and data analysis for biologists’, 1st edn. (Cambridge University Press: Cambridge, UK)

Rossa CG, Fernandes PM, Pinto A (2015) Measuring foliar moisture content with a moisture analyzer. Canadian Journal of Forest Research 45, 776–781.
Measuring foliar moisture content with a moisture analyzer.Crossref | GoogleScholarGoogle Scholar |

Rothermel RC (1972) A mathematical model for predicting fire spread in wildland fuels. USDA Forest Service, Intermountain Forest and Range Experiment Station, Research Paper INT-115. (Ogden, UT)

Rothermel RC, Anderson HE (1966) Fire spread characteristics determined in the laboratory. USDA Forest Service, Intermountain Forest and Range Experiment Station, Research Paper INT-30. (Ogden, UT)

Roussopoulos PJ (1978) An appraisal of upland forest fuels and potential fire behavior for a portion of the Boundary Waters Canoe Area. PhD thesis, Michigan State University, East Lansing, MI.

Sullivan AL (2009) Wildland surface fire spread modelling; 1990–2007. 1: Physical and quasi-physical models. International Journal of Wildland Fire 18, 349–368.
Wildland surface fire spread modelling; 1990–2007. 1: Physical and quasi-physical models.Crossref | GoogleScholarGoogle Scholar |

Thomas JC (2012) Experiments for determining the density of Pinus resinosa needles. (Fire Protection Engineering Department, Worcester Polytechnic Institute: Worcester, MA)

Van Wagner CE (1968) Fire behaviour mechanisms in a red pine plantation: field and laboratory evidence. Canadian Forest Service, Forestry Branch Departmental Publication No. 1229. (Ottawa, OT)

Van Wagner CE (1988) Effect of slope on fires spreading downhill. Canadian Journal of Forest Research 18, 818–820.

Viegas DX (2004) On the existence of a steady-state regime for slope and wind driven fire. International Journal of Wildland Fire 13, 101–117.
On the existence of a steady-state regime for slope and wind driven fire.Crossref | GoogleScholarGoogle Scholar |

Weise DR, Biging GS (1996) Effects of wind velocity and slope on flame properties. Canadian Journal of Forest Research 26, 1849–1858.
Effects of wind velocity and slope on flame properties.Crossref | GoogleScholarGoogle Scholar |

Weise DR, Biging GS (1997) A qualitative comparison of fire spread models incorporating wind and slope effects. Forest Science 43, 170–180.

Wengert EM, Donnelly DM, Markstrom DC, Worth HE (1985). Wood utilization. In ‘Aspen: ecology and management in the Western United States’. (Eds NV DeByle, RO Winokur) pp. 169–180. USDA Forest Service, Rocky Mountain Research Station, General Technical Report RM-119. (Fort Collins, CO)

Willmott CJ (1982) Some comments on the evaluation of model performance. Bulletin of the American Meteorological Society 63, 1309–1313.
Some comments on the evaluation of model performance.Crossref | GoogleScholarGoogle Scholar |

Wolff MF, Carrier GF, Fendell FE (1991) Wind-aided fire spread across arrays of discrete fuel elements II: experiment. Combustion Science and Technology 77, 261–289.
Wind-aided fire spread across arrays of discrete fuel elements II: experiment.Crossref | GoogleScholarGoogle Scholar |

Wotton BM, McAlpine RS, Hobbs MW (1999) The effect of fire front width on surface fire behaviour. International Journal of Wildland Fire 9, 247–253.
The effect of fire front width on surface fire behaviour.Crossref | GoogleScholarGoogle Scholar |

Xu F, Guo W, Xu W, Wang R (2008) Habitat effects on leaf morphological plasticity in Quercus acutissima. Acta Biologica Cracoviensia. Series Botanica 50, 19–26. . Available at http://www2.ib.uj.edu.pl/abc/pdf/50_2/019-026-XU.pdf [Verified 11 August 2015]