Mapping the distance between fire hazard and disaster for communities in Canadian forests

Area of Science:

• Environmental Science
• Forestry
• Risk Management

Background:

• Canadian wildland communities face escalating threats from larger, more frequent wildfires.
• Effective wildland fire risk reduction requires identifying fireshed sources and spread pathways to communities.

Purpose of the Study:

• To map firesheds, fire pathways, corridors, and spread distances for 1980 Canadian communities.
• To analyze spatial patterns and directional trends of simulated wildfire spread.

Main Methods:

• Utilized fire simulation model outputs, including fire polygons and rate of spread.
• Mapped firesheds, pathways, corridors, and spread distances for numerous communities across Canada's forested regions.
• Applied Rayleigh Z test to assess directional fire trends.

Main Results:

• Fireshed sizes were larger in northern Canada, with mean distances to ecumene exceeding 10 km.
• Significant directional fire trends were observed, particularly in the Boreal Plains and Shields.
• Average fire spread distances were approximately 5, 12, and 18 km within 1, 2, and 3 days, respectively, increasing with latitude.
• Shortest spread distances were found in the Pacific Maritime, Atlantic Maritime, and Boreal Plains Ecozones.

Conclusions:

• Wildfire spread dynamics vary significantly across Canadian ecozones.
• Factors beyond fuel, such as fire weather and ignition patterns, critically influence fire behavior and direction into communities.
• Findings are vital for developing targeted community protection and risk-reduction strategies against wildland fires.