Table 4. --Values of burned area/initial area and final perimeter 1 ength/ i n i t i a 1 

 perimeter length when the suppression tactic is to build barriers ahead of 

 the fire as sketched in figure 4. Also, tabulated is the first barrier 

 distance ahead of the fire (a) divided by r^io) , the distance from the point 

 of ignition to the head of the fire. A is the rate of suppression, Vp the 

 forward rate of spread, and the flanking rate; n is a fire shape parameter 

 (see figure 2) 





* 





M i n i m urn 



val ues of 





First barrier 1 



ocation, a/r.^(o) 



X 





Burned area 



Pe rir 



ete r 1 



ena th 



Fo r m i n i m urn 



Fo r m i n i m um 





^ - 



initial a re a 



initial peri meter 



burned area 



perimeter I 



n n f" hi 

 city L 1 1 







n=] 



n=2 



n = 4 



n = l 



n = 2 



n = 4 



n = l 



n=2 



n=4 



n=l 



n = 2 



n = 4 





0. 1 



1.72 



1.54 



1.42 



1.36 



1 .25 



1.17 



0.04 



<.02 



<.02 



.06 



.05 



0.03 



2 



.2 



1.87 



1.67 



1.55 



1.41 



1 .30 



1 .22 



.04 



.04 



<.02 



.07 



.05 



.03 





. 3 



2.07 



1.85 



1.72 



1.48 



1.36 



1 .29 



.05 



.04 



<.02 



■ 



.07 



.06 



• 03 





. ] 



2. 15 



1 .81 



1.60 



1 .55 



1.36 



1.24 



. 10 



.07 



.04 



• 1 3 



.09 



.05 



1.5 



.2 



2.43 



2.04 



1.81 



1.64 



1 .44 



1 .32 



. 10 



.07 



.04 



.15 



. 10 



.06 





. 3 



2. 82 



2.35 



2.09 



1.75 



1.54 



1 .42 



1 



. 12 



.08 



.04 



.16 



.11 



.06 





. 1 



2.66 



2.10 



1.77 



1.75 



1.48 



1.31 



. 14 



.09 



.06 



. 19 



. 12 



.07 



1.25 



.2 



3- 1 1 



2.43 



2.07 



1.88 



1 .59 



1 .42 



. 15 



. 10 



.07 



.11 



■ 13 



.08 





.3 



3.78 



2.92 



2.48 



2.04 



1.73 



1.55 



.18 



.13 



.08 



.25 



.,5 



.08 





. 1 



3.96 



2. 70 



2.11 



2.19 



1 . 70 



1.44 



.34 



.20 



. 1 1 



. 39 



.23 



. 13 



1.0 



.2 



4.98 



3-32 



2.58 



2.42 



1 .87 



1 .59 



. 38 



.22 



. 1 3 



.44 



.25 



. 16 





. 3 



6.65 



4.28 



3.29 



2.75 



2. 10 



1.79 



.45 



.26 



.15 



.49 



.28 



.18 





. 1 



5.34 



3.21 



2.34 



2.57 



1.86 



; 1 .52 



.54 



.29 



. 15 



.59 



.31 



. 15 



0.9 



.2 



7. 13 



4.09 



2.96 



2.93 



2.08 



1.70 



.62 



.32 



.17 



.66 



.35 



.19 





. 3 



10.3 



5.54 



3.93 



3.44 



2.40 



1 .96 



.72 



.37 



.20 



.76 



.40 



.21 





. 1 



1 



9.44 



4.19 



2.73 



3.42 



2.14 



1 .64 



1 . 12 



.47 



.23 



1 . 12 



.47 



.24 



0.8 



.2 



14.3 



5.65 



3.60 



4. 14 



2.46 



1 .88 



1 .37 



.54 



.26 



1.37 



.55 



.27 





•3 



25.3 



8.31 



5.04 



5.37 



2.95 



2.22 



1.78 



.65 



.30 



1.78 



.65 



• 31 





. ] 



41.0 



6.88 



3.54 



7. 10 



2.73 



1.87 



3.50 



.90 



.40 



3.50 



.90 



.40 



0.7 



.2 



116.0 



10.5 



5.12 



11.7 



3.33 



; 2.23 



5.80 



1 . 10 



.50 



5.80 



1 . 10 



.50 





.3 





18.2 



7.89 





4.36 



1 



! 2.77 

 1 



>10 



1 .40 



.60 



1 



>10 



i 



1 .40 



.60 



For al 1 cases , V„/V,- = 0.5 



14 



