An Analysis of Dodge's Escape Fire on the 1949 Mann Gulch Fire in ...

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Calculations <strong>of</strong> Flame Front Dimensions Flame front residence time: 5-155 seconds for grass Rate <strong>of</strong> fire spread: 360 ft/min or 6 ft/sec Available fuel load: 1.56 tons/acre or 0.072 lb/ft 2 Mid-flame wind speeds: 15-20 mph Flame depth = 5 sec x 6 ft/sec = 30 ft to 15 sec x 6 ft/sec = 90 ft Byram’s s (1959) <strong>Fire</strong>line Intensity = Fuel Heat Content (7444 Btu/lb) x 0.072 lb/ft2 x 6 ft/sec = 3333 Btu/sec-ft Equivalent to a Flame Length <strong>of</strong> 19 ft Nelson & Adkins (1986) Flame Height vs. Flame Length and Mid-flame Wind Speed model prediction: 12.5 ft
Maclean (1992): Flames “would have been thirty feet tall”. Butler & Cohen (1998): “Flames were 10 m [33 ft] high (Rothermel 1993)”. Rothermel (1993): Flames would have “ranged from 10 to 40 ft long” Rothermel & Brown (2000): “flame lengths might have reached 40 feet”
Page 1 and 2: An An</str
Page 3 and 4: Mann Gulch Fire Su
Page 5 and 6: Norman Maclean
Page 7 and 8: The story of the M
Page 9 and 10: Dodge’s s Escape
Page 11 and 12: General Approach to the Problem Pri
Page 13 and 14: The Fire Environme
Page 15 and 16: The “Power of th
Page 17 and 18: Starr Jenkins was a Missoula smokej
Page 19 and 20: Rothermel (1993) on Dodge’s s esc
Page 21 and 22: Wag Dodge’s s Board of</s
Page 23 and 24: Forward Spread Distance based Dodge
Page 25 and 26: Length-to to-Breadth (L/B) Ratio vs
Page 27: Q2: How tall were the flames <stron
Page 31 and 32: Other photos from NWCG website conv
Page 33: Cheney and Sullivan (2008) Empirica
Page 36 and 37: Simulation of the
Page 38 and 39: Maximum Heat Flux During Flame Fron
Page 40 and 41: Maximum Heat Flux During Flame Fron
Page 42 and 43: EPILOGUE: Did Dodge really get lift
Page 44: In Summary It’s s estimated that

An Analysis of Dodge's Escape Fire on the 1949 Mann Gulch Fire in ...

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