Dead Man Zone 5


Dead Man Zone 5 : Project Vesta: They include: (1) Traditional tables of forest fire behaviour, which have been in use for guiding fire management decisions since the mid 1960, were found to under-predict the potential rate of fire spread in dry forests at higher wind speeds by a factor of up to 3-fold. This information is critical to decision-making during situations of high fire danger. (2) Lines of fire longer than 100 m and aligned perpendicular to the prevailing wind, while taking time to build up flame dimensions, reach the potential rate of spread immediately. This finding has important implications for fire-fighter safety (inasmuch as the so-called Dead Man Zone then manifests), and has already been incorporated into national training programs. (3) A new relationship between the wind speed and the rate of fire spread has been described and this will provide more reliable extrapolation to the very high wind speeds experienced during extreme weather. (4) A method has been developed for describing fuel structure that is robust and easy for field operators to apply to a range of different fuel types, and which is effective for predicting fire behaviour and relative suppression difficulty. (5) The temperature structure of a flame front, an important variable for fire prediction purposes, has been analysed and described. (6) A statistical measure of the variation of the wind structure within a forest, describing the error associated with a prediction of fire spread that is caused by wind variability alone, has been developed. Such error determinations are crucial for risk assessment during decision-making
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