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Title: Atmosphere-fire simulation of effects of low-level jets on pyro-convective plume dynamics

Author: Simpson, Colin C.; Katurji, Marwan; Kiefer, Michael T.; Zhong, Shiyuan; Charney, Joseph J.; Heilman, Warren E.; Bian, Xindi.;

Date: 2013

Source: In: Piantadosi, J.; Anderssen, R.S.; Boland, J., eds. MODSIM2013, 20th International Congress on modelling and simulation; 2013 December 1-6; Adelaide, Australia. [Place of publication unknown]: Modelling and Simulation Society of Australia and New Zealand: 270-276.

Publication Series: Paper (invited, offered, keynote)

Description: Blow-up fire behaviour can be broadly defined as a rapid escalation in the intensity or forward rate of spread of a wildland fire, and is often accompanied by extreme pyro-convection associated with rapid smoke release and dispersion. Blow-up fire behaviour is difficult to predict and has been linked to firefighter fatalities, making it an important fire management hazard. Byram (1954) compiled the first observational dataset of categorised wind speed and direction profiles associated with blow-up fire behaviour. Low-level jets, varying in height between 30 and 1000 m above ground level (AGL), are a common feature in Byram's wind-profile types. Additional studies have qualitatively discussed how low-level jets can influence wildland fire behaviour and pyro-convective plume dynamics. However, there has been little quantitative testing and analysis of the physical processes linking low-level jets and blow-up fire behaviour. The principle aim of this study was to use the Advanced Regional Prediction System (ARPS) at high-resolution, with a 50 m horizontal grid spacing, to numerically simulate the sensitivity of the downwind pyro-convective plume dynamics to four of the Byram wind-profile types.

Keywords: Blow-up fire behaviour, atmosphere-fire numerical modelling, pyro-convective plume dynamics

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Simpson, Colin C.; Katurji, Marwan; Kiefer, Michael T.; Zhong, Shiyuan; Charney, Joseph J.; Heilman, Warren E.; Bian, Xindi. 2013. Atmosphere-fire simulation of effects of low-level jets on pyro-convective plume dynamics. In: Piantadosi, J.; Anderssen, R.S.; Boland, J., eds. MODSIM2013, 20th International Congress on modelling and simulation; 2013 December 1-6; Adelaide, Australia. [Place of publication unknown]: Modelling and Simulation Society of Australia and New Zealand: 270-276.

 


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