Treatments and methods to manipulate stand structure suitable for fuel reduction.
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Transcript of Treatments and methods to manipulate stand structure suitable for fuel reduction.
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Treatments and methods to manipulate stand structure suitable for fuel
reduction
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Objectives
Review the terminology used in fuels management.
Common understanding of how to modify fuels to change fire behavior.
Describe the tools utilized for fuels reduction
Discuss the Constraints and Challenges to implement prescribed Fire.
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FUELS MANAGEMENT - the manipulation, modification,
and reduction of flammable vegetation to meet fire protection and land management goals. (SAF Forestry Handbook, 1984)
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• VALUES (at risk to wildfire)
• RISK (potential to ignite)
• HAZARD (potential to burn)
Factor that need to be evaluated in Fuels Management
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Rothermal Fire Spread Equation
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Surface Fuels
(Canopy Base Height)
Crown Bulk Density
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Assessment for the Potential Of Crown Fire Activity
1) Surface Fuel Loading
2) Ladder Fuels Average height from the surface fuel to the lowest crownsof trees. (canopy base height)
3) Volume of crown fuel present (crown bulk density)
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Surface fuels need to produce enough heat intensity while burning to ignite the lowest portion of the crowns to initiate crown fire.
Material <3” in diameter influence rate of spread
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Larger fuels influence duration and intensity
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Rate of spread? intensity? duration?
With this fuel loading – need a crown fire to damage a stand?
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Rate of spread, intensity, duration?
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The lowest portion of the canopy (canopy base height) and its relationship to the surface fuels is critical in the initiation phase of a crown fire (torching).
Ladder Fuels
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The fuel volume in the crowns (crown bulk density) is a factor for sustaining crown fire over a given distance.
- slope & wind are other factors that influence crown fire
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Tools for Managing:
Surface Fuel Loading
Average height from the surface fuel to the lowest crownsof trees.
Volume of crown fuel present
*
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Commercial Thinning
Thinned removing the smallest diameter trees.
Increases Tree vigor.
Reduces crown bulk density and some of the available ladder fuels.
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Commercial Thinning – removes >8” dbh
Non-Commercial Thinning removes < 8“ dbh (ladder fuels)
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Density Management & Fuels Reduction in CHU
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Commercial Thinning
Have a reduction in aerial fuels (crown bulk density)
Have a reduction in ladder fuels (crown base height) (along with precommercial thinning)
Increase in surface fuels (may have to treat)
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Treatment of surface fuels
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Reduce surface fuels & some ladder fuels
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Time of year will determine the fuel size that is consumed.
Time of year will impact cost and potential for escape.
Ecological impacts
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Manual Treatment
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Handpiling:Treats fuel: <6” in diameter and 2’ and longer
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Manual Treatments: (Ave. Costs)• Thinning(<8”dbh) $459 / acre• Slashbuster $400 / acre• Pile & Cover $575 / acre
Burning Treatments: (Ave Costs)• Pile Burn $ 50 / ac•Underburn $250 / ac
Example of Average Unit Cost (manual treatment):Thin + Pile + Pile Burn = $1,084 / acre
Why not just underburn?
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Constraints and Challenges
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Smoke Management
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– Local Considerations (outside designated areas)
-Type of Burning impacts emissions
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Stand Objectives
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Survey and managed Species
Seasonal Constraints – may conflict with a burn window
Costs to conduct surveys
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Survey and Managed Species
Manual treatment
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Size of Landscape Treatments
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Strategy
Size of treatment?
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Accountability
GAO
Are we treating high priority areas? WUI vs. high values at risk outside of the WUI.
Are treatments effective?Are we compromising effective treatments to meet other objectives?
Are we treating in the WUI?
Reporting System (Targets)
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Political Aspects
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Fires of 2000
National Fire Plan
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Fires of 2002
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San Diego 2003
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Healthy Forests Restoration Act
• Passed on November 21, 2003
• 20 million acres federal land at high risk of catastrophic wildfire
• Authorize $760 million for tree-thinning projects (half in WUI)
• Requires federal courts to balance environmental consequences of thinning vs. the no- action.
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Field Trip
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