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Table 3 Characteristics of observed and randomly located re-burns by size class for each study area. Size class thresholds reflect the common fire size classes as recognized by the NWCG (2006). The numbers for the random values reflect the average of the 50 simulations.

From: Characterizing Fire-on-Fire Interactions in Three Large Wilderness Areas

    Re-burn size class (ha)
    40 to 121 121 to 405 >405 Total
Bob Marshall Observed Frequency 11 6 12 29
Proportion of total occurrence (%) 38 % 21 % 41 % 100 %
Total area re-burned (ha) 698 1 593 13 853 16 144
Average size of re-burn (ha) 63 266 1 154 557
Random Average frequency 8 10 18 36
Proportion of total occurrence (%) 22 % 28 % 18 % 100 %
Average total area re-burned (ha) 606 2 413 36 078 39 098
Average size of re-burn (ha) 73 237 2 025 1 075
Selway-Bitterroot Observed Frequency 13 8 5 26
Proportion of total occurrence (%) 50 % 31 % 19 % 100 %
Total area re-burned (ha) 925 2 070 5 942 8 937
Average size of re-burn (ha) 71 259 1 188 344
Random Average frequency 8 11 7 26
Proportion of total occurrence (%) 31 % 42 % 27 % 100 %
Average total area re-burned (ha) 572 2 702 6 317 9 591
Average size of re-burn (ha) 73 240 880 366
Frank Church Observed Frequency 85 63 80 228
Proportion of total occurrence (%) 37 % 28 % 35 % 100 %
Total area re-burned (ha) 6 040 15 535 150 099 171 674
Average size of re-burn (ha) 71 247 1 876 753
Random Average frequency 54 72 118 244
Proportion of total occurrence (%) 22 % 30 % 48 % 100 %
Average total area re-burned (ha) 3 968 17 775 251 656 273 399
Average size of re-burn (ha) 74 247 2 134 1 122