Low heat of combustion varies so little from fuel to fuel, roughly *lo% (Van Wagner 1972b), that it can (generally) be thought of as a constant. Fuel consumption varies over a fairly narrow range (ca. 10-fold),whereas rate of spread may vary 100-fold (Van Wagner1965a). Thus, frontal fire intensity may vary by more than 1000-fold or, according to Byram (1959), from approximately 15 to at least 100000 kW/m, largely because of the potential variation in rate of fire spread. Such extremes have been documented in Canadian forests (e.g., Kiil and Grigel 1969; Methven and Murray
1974) and elsewhere. However, fire intensities seldom exceed 50 000 kW/m and most crown fires fall within the range of 10 000 - 30 000 kW/m.
Low heat of combustion varies so little from fuel to fuel, roughly *lo% (Van Wagner 1972b), that it can (generally) be thought of as a constant. Fuel consumption varies over a fairly narrow range (ca. 10-fold),whereas rate of spread may vary 100-fold (Van Wagner1965a). Thus, frontal fire intensity may vary by more than 1000-fold or, according to Byram (1959), from approximately 15 to at least 100000 kW/m, largely because of the potential variation in rate of fire spread. Such extremes have been documented in Canadian forests (e.g., Kiil and Grigel 1969; Methven and Murray1974) and elsewhere. However, fire intensities seldom exceed 50 000 kW/m and most crown fires fall within the range of 10 000 - 30 000 kW/m.
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