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Article << Previous     |     Next >>   Contents Vol 22(5)

Large eddy simulation of atypical wildland fire spread on leeward slopes

Colin C. Simpson A D , Jason J. Sharples A , Jason P. Evans B and Matthew F. McCabe C

A School of Physical, Environmental and Mathematical Sciences, University of New South Wales at Canberra, Canberra, ACT 2600, Australia.
B Climate Change Research Centre, Faculty of Science, University of New South Wales, Sydney, NSW 2052, Australia.
C School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
D Corresponding author. Email: colin.c.simpson@gmail.com

International Journal of Wildland Fire 22(5) 599-614 http://dx.doi.org/10.1071/WF12072
Submitted: 10 May 2012  Accepted: 12 December 2012   Published: 25 March 2013


 
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Abstract

The WRF-Fire coupled atmosphere–fire modelling system was used to investigate atypical wildland fire spread on steep leeward slopes through a series of idealised numerical simulations. The simulations are used to investigate both the leeward flow characteristics, such as flow separation, and the fire spread from an ignition region at the base of the leeward slope. The fire spread was considered under varying fuel type and with atmosphere-fire coupling both enabled and disabled. When atmosphere–fire coupling is enabled and there is a high fuel mass density, the fire spread closely resembles that expected during fire channelling. Specifically, the fire spread is initially dominated by upslope spread to the mountain ridge line at an average rate of 2.0 km h–1, followed by predominantly lateral spread close to the ridge line at a maximum rate of 3.6 km h–1. The intermittent rapid lateral spread occurs when updraft–downdraft interfaces, which are associated with strongly circulating horizontal winds at the mid-flame height, move across the fire perimeter close to the ridge line. The updraft–downdraft interfaces are formed due to an interaction between the strong pyro-convection and the terrain-modified winds. Through these results, a new physical explanation of fire channelling is proposed.



References

Allen T, Brown AR (2002) Large-eddy simulation of turbulent separated flow over rough hills. Boundary-Layer Meteorology 102, 177–198.
CrossRef |

Anderson HE (1982) Aids to determining fuel models for estimating fire behaviour. USDA Forest Service, Intermountain Forest and Range Experiment Station, General Technical Report INT-122. (Ogden, UT)

Ayotte KW (2008) Computational modelling for wind energy assessment. Journal of Wind Engineering and Industrial Aerodynamics 96, 1571–1590.
CrossRef |

Clark TL, Jenkins MA, Coen J, Packham D (1996a) A coupled atmosphere–fire model: convective feedback on fire-line dynamics. Journal of Applied Meteorology 35, 875–901.
CrossRef |

Clark TL, Jenkins MA, Coen JL, Packham DR (1996b) A coupled atmosphere–fire model: role of the convective Froude number and dynamic fingering at the fireline. International Journal of Wildland Fire 6, 177–190.
CrossRef |

Clark TL, Coen J, Latham D (2004) Description of a coupled atmosphere–fire model. International Journal of Wildland Fire 13, 49–63.
CrossRef |

Coen JL (2005) Simulation of the Big Elk fire using coupled atmosphere–fire modeling. International Journal of Wildland Fire 14, 49–59.
CrossRef |

Countryman CM (1971) Fire whirls... why, when, and where. USDA Forest Service, Pacific Southwest Forest and Range Experiment Station, Technical report (Berkeley, CA)

Cunningham P, Linn RR (2007) Numerical simulations of grass fires using a coupled atmosphere–fire model: dynamics of fire spread. Journal of Geophysical Research 112, D05108
CrossRef |

Cunningham P, Goodrick SL, Yousuff Hussaini M, Linn RR (2005) Coherent vortical structures in numerical simulations of buoyant plumes from wildland fires. International Journal of Wildland Fire 14, 61–75.
CrossRef |

Ding L, Calhoun RJ, Street RL (2003) Numerical simulation of strongly stratified flow over a three-dimensional hill. Boundary-Layer Meteorology 107, 81–114.
CrossRef |

Doyle JD, Durran DR (2002) The dynamics of mountain-wave-induced rotors. Journal of the Atmospheric Sciences 59, 186–201.
CrossRef |

Doyle JD, Durran DR (2007) Rotor and subrotor dynamics in the lee of three-dimensional terrain. Journal of the Atmospheric Sciences 64, 4202–4221.
CrossRef |

Heilman WE (1992) Atmospheric simulations of extreme surface heating episodes on simple hills. International Journal of Wildland Fire 2, 99–114.
CrossRef |

Heilman WE, Fast JD (1992) Simulations of horizontal roll vortex development above lines of extreme surface heating. International Journal of Wildland Fire 2, 55–68.
CrossRef |

Hertenstein RF, Kuettner JP (2005) Rotor types associated with steep lee topography: influence of the wind profile. Tellus 57A, 117–135.

Katurji M, Zhong S, Zawar-Reza P (2011) Long-range transport of terrain-induced turbulence from high-resolution numerical simulations. Atmospheric Chemistry and Physics 11, 11793–11805.
CrossRef | CAS |

Kirkil G, Mirocha J, Bou-Zeid E, Chow FK, Kosovic B (2012) Implementation and evaluation of dynamic subfilter-scale stress models for large-eddy simulation using WRF. Monthly Weather Review 140, 266–284.
CrossRef |

Klemp JB, Dudhia J, Hassiotis AD (2008) An upper gravity-wave absorbing layer for NWP applications. Monthly Weather Review 136, 3987–4004.
CrossRef |

Linn R, Reisner J, Colman JJ, Winterkamp J (2002) Studying wildfire behaviour using FIRETEC. International Journal of Wildland Fire 11, 233–246.
CrossRef |

Linn R, Winterkamp J, Edminster C, Colman JJ, Smith WS (2007) Coupled influences of topography and wind on wildland fire behaviour. International Journal of Wildland Fire 16, 183–195.
CrossRef |

Mandel J, Beezley JD, Kochanski AK (2011) Coupled atmosphere–wildland fire modeling with WRF 3.3 and SFIRE 2011. Geoscientific Model Development 4, 591–610.
CrossRef |

McRae R (2004) Breath of the dragon – observations of the January 2003 ACT bushfires. In ‘Proceedings of Earth, Wind and Fire: Fusing the Elements’, 25–28 May 2004, Adelaide, SA. (Department for Environment, Water and Natural Resources) Available at http://www.environment.sa.gov.au/files/26a7a88d-16af-49c3-b1ad-9e3300b2a9a0/the_breath_of_the_dragon_v2.pdf [Verified 17 January 2013]

Mell W, Jenkins MA, Gould J, Cheney P (2007) A physics-based approach to modelling grassland fires. International Journal of Wildland Fire 16, 1–22.
CrossRef |

Mirocha JD, Lundquist JK, Kosovic B (2010) Implementation of a nonlinear subfilter turbulence stress model for large-eddy simulation in the Advanced Research WRF model. Monthly Weather Review 138, 4212–4228.
CrossRef |

Pathirana A, Yamaguchi M, Yamada T (2003) Idealized simulation of airflow over a mountain ridge using a mesoscale atmospheric model. Annual Journal of Hydraulic Engineering 47, 31–36.
CrossRef |

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)

Schär C, Durran DR (1997) Vortex formation and vortex shedding in continuously stratified flows past isolated topography. Journal of the Atmospheric Sciences 54, 534–554.
CrossRef |

Sharples JJ (2009) An overview of mountain meteorological effects relevant to fire behaviour and bushfire risk. International Journal of Wildland Fire 18, 737–754.
CrossRef |

Sharples JJ, McRae RHD (2011) Atypical bushfire spread driven by the interaction of terrain and extreme fire weather. In ‘Proceedings of Bushfire CRC & AFAC 2011 Conference Science Day’, 1 September 2011, Sydney. (Ed. RP Thornton) (Bushfire CRC: Melbourne)

Sharples JJ, McRae RHD, Weber RO (2010a) Wind characteristics over complex terrain with implications for bushfire risk management. Environmental Modelling & Software 25, 1099–1120.
CrossRef |

Sharples JJ, Viegas DX, Rossa CG, McRae RHD (2010b) Small-scale observations of atypical fire spread caused by the interaction of wind, terrain and fire. In ‘Proceedings of the VI International Conference on Forest Fire Research’, 15–18 November 2010, Coimbra, Portugal. (Ed. DX Viegas) (University of Coimbra: Coimbra, Portugal)

Sharples JJ, Viegas DX, McRae RHD, Raposo JRN, Farinha HAS (2011). Lateral bushfire propagation driven by the interaction of wind, terrain and fire. In ‘MODSIM2011, 19th International Congress on Modelling and Simulation’, 12–16 December 2011, Perth, WA. (Eds F Chan, D Marinova, RS Anderssen) pp. 235–241. (Modelling and Simulation Society of Australia and New Zealand: Sydney)

Sharples JJ, McRae RHD, Wilkes SR (2012) Wind-terrain effects on the propagation of wildfires in rugged terrain: fire channelling. International Journal of Wildland Fire 21, 282–296.
CrossRef |

Sheridan PF, Vosper SB (2005) Numerical simulations of rotors, hydraulic jumps and eddy shedding in the Falkland Islands. Atmospheric Science Letters 6, 211–218.
CrossRef |

Skamarock WC, Klemp JB, Dudhia J, Gill DO, Barker DM, Duda MG, Huang XY, Wang W, Powers JG (2008) A description of the Advanced Research WRF Version 3, NCAR technical note 475 edition. Available at http://www.mmm.ucar.edu/wrf/users/docs/ [Verified 17 January 2013]

Sun R, Krueger SK, Jenkins MA, Zulauf MA, Charney JJ (2009) The importance of fire–atmosphere coupling and boundary-layer turbulence to wildfire spread. International Journal of Wildland Fire 18, 50–60.
CrossRef |


   
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