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Topographic Effects on Fire Behavior

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).

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Topographic Effects on Fire Behavior

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  1. Topographic Effects on Fire Behavior

  2. 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).

  3. Factors of Topography That Affect Spread of Fire Direction a slope faces. Aspect-- 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.

  4. ASPECT NORTH HEAVY FUELS SHADE MOIST SOUTH LIGHT FUELS SUNNY DRY

  5. STEEP SLOPES CAUSE RAPID FIRE SPREAD

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

  7. The Shape of the Country • Box Canyons • Narrow Canyons • Ridges • Saddles

  8. BOX CANYON & CHIMNEY EFFECT

  9. RADIANT HEAT ACROSS NARROW CANYON/VALLEY

  10. SPOTTING ACROSS NARROW CANYON/VALLEY

  11. LATERAL RIDGE TO CANYON/VALLEY

  12. MOUNTAINS CAUSE CHANNELING OF WIND

  13. ELEVATION TREES SHRUBS GRASS SEA LEVEL

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