Topographic Effects on Fire Behavior. Objectives §Describe how slope affects fire spread. §List five factors of topography that affect fire behavior.

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Presentation transcript:

Topographic Effects on Fire Behavior

Objectives §Describe how slope affects fire spread. §List five factors of topography that affect fire behavior. §Describe the dangerous conditions that can develop in a box canyon and steep narrow canyons (valleys).

Factors of Topography That Affect Spread of Fire Aspect--Direction a slope faces. Slope-- Steepness Position of Fire-- Top, middle, or bottom of slope. Shape of Country-- Narrow canyons/valleys and boxed canyons/valleys. Elevation-- Relates to curing of fuels, precipitation, length of fire, season, etc.

ASPECT NORTH HEAVY FUELS SHADE MOIST SOUTH LIGHT FUELS SUNNY DRY

STEEP SLOPES CAUSE RAPID FIRE SPREAD

POSITION OF FIRE ON SLOPE SLOPE FIRE NEAR TOP OF SLOPE FSDefaultUser:

The Shape of the Country §Box Canyons §Narrow Canyons §Ridges §Saddles

BOX CANYON & CHIMNEY EFFECT

RADIANT HEAT ACROSS NARROW CANYON/VALLEY

SPOTTING ACROSS NARROW CANYON/VALLEY

LATERAL RIDGE TO CANYON/VALLEY

MOUNTAINS CAUSE CHANNELING OF WIND

ELEVATION SEA LEVEL GRASS SHRUBS TREES