Introduction to FuelModels S 390 classroom module

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Introduction to the 40

Fire Behavior Fuel

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Three-part naming

convention used for the 40

Fire Behavior Fuel Models

1. Fuel model code

NB

(Timber Understo ry)

TL

(Timber Litter)

SB

(Slash Blowdo wn)

NB1 GR1 GS1 SH1 TU1 TL1 SB1

NB9 GR5 SH5 TU5 TL5

GR6 SH6 TL6

GR7 SH7 TL7

GR8 SH8 TL8

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Three-part naming convention used for the

40 Fire Behavior Fuel Models

1. Fuel model code 2. Fuel model number

Fuel Type Fuel Model Number Block

Used in original or new set

Reserved for future standard fuel

models

Available for custom fuel

models

1-13 1-13

14-89 14-89

NB 90-99 91-93, 98-99 94-95 90,96-97

GR 100-119 101-109 110-112 100,113-119

GS 120-139 121-124 125-130 120-131-139

SH 140-159 141-149 150-152 140,153-159

TU 160-179 161-165 166-170 160,171-179

TL 180-199 181-189 190-192 180,

193-199

SB 200-219 201-204 205-210 200,

211-219

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models

1-13 1-13

14-89 14-89

NB 90-99 91-93, 98-99 94-95 90,96-97

GR 100-119 101-109 110-112 100,113-119

GS 120-139 121-124 125-130 120-131-139

SH 140-159 141-149 150-152 140,153-159

TU 160-179 161-165 166-170 160,171-179

TL 180-199 181-189 190-192 180,

193-199

SB 200-219 201-204 205-210 200,

211-219

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models

1-13 1-13

14-89 14-89

NB 90-99 91-93, 98-99 94-95 90,96-97

GR 100-119 101-109 110-112 100,113-119

GS 120-139 121-124 125-130 120-131-139

SH 140-159 141-149 150-152 140,153-159

TU 160-179 161-165 166-170 160,171-179

TL 180-199 181-189 190-192 180,

193-199

SB 200-219 201-204 205-210 200,

211-219

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models

1-13 1-13

14-89 14-89

NB 90-99 91-93, 98-99 94-95 90,96-97

GR 100-119 101-109 110-112 100,113-119

GS 120-139 121-124 125-130 120-131-139

SH 140-159 141-149 150-152 140,153-159

TU 160-179 161-165 166-170 160,171-179

TL 180-199 181-189 190-192 180,

193-199

SB 200-219 201-204 205-210 200,

211-219

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models

1-13 1-13

14-89 14-89

NB 90-99 91-93, 98-99 94-95 90,96-97

GR 100-119 101-109 110-112 100,113-119

GS 120-139 121-124 125-130 120-131-139

SH 140-159 141-149 150-152 140,153-159

TU 160-179 161-165 166-170 160,171-179

TL 180-199 181-189 190-192 180,

193-199

SB 200-219 201-204 205-210 200,

211-219

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models

1-13 1-13

14-89 14-89

NB 90-99 91-93, 98-99 94-95 90,96-97

GR 100-119 101-109 110-112 100,113-119

GS 120-139 121-124 125-130 120-131-139

SH 140-159 141-149 150-152 140,153-159

TU 160-179 161-165 166-170 160,171-179

TL 180-199 181-189 190-192 180,

193-199

SB 200-219 201-204 205-210 200,

211-219

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Example of how fuel model code and fuel model number are applied in a

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Three-part naming convention used for the 40 Fire Behavior Fuel Models

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Fuel Model Code

Fuel Model Number

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Dynamic fuel

models

• _{Allocation of herbaceous}

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Dynamic fuel

models

7 5

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Dynamic fuel models

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Dynamic fuel

models

• _{Allocation of herbaceous}

load to live and dead

• _{Dead herbaceous load}

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Dynamic fuel

models

• _{Allocation of herbaceous}

load to live and dead

• _{Dead herbaceous load}

takes on dead 1-hr MC

• _{Increases ability (and}

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Let’s look at the Fuel Model codes used in

the 40 Fire Behavior Fuel Model naming

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Non-burnable Fuel Type Models (NB)

In all non-burnable fuel models there is no fuel load – wildland fire will not spread. These NB fuel models were developed to provide

consistency in how the non-burnable portions of the landscape are displayed on a fuel model map.

NB1 = Urban Developed

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Grass Fuel Type Models (GR)

The primary carrier of fire in the GR fuel models is grass. Fire behavior varies from moderate spread rate and low flame length in the sparse grass to extreme spread rate and

flame length in the tall grass models. Fuel bed depth may range between 1 foot and 2.5 feet deep.

GR1 = Short, Sparse Dry Climate Grass

(Dynamic)

GR2 = Low Load, Dry Climate Grass

(Dynamic)

GR3 = Low Load, Very Coarse, Humid Climate

Grass (Dynamic)

GR4 = Moderate Load, Dry Climate Grass

(Dynamic)

GR5 = Low Load, Humid Climate Grass

(Dynamic)

GR6 = Moderate Load, Humid Climate Grass

(Dynamic)

GR7 = High Load, Dry Climate Grass

(Dynamic)

GR8 = High Load, Very Coarse, Humid

Climate Grass (Dynamic)

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Grass-Shrub Fuel Type Models (GS)

The primary carrier of fire in the GS fuel models is grass and shrubs combined; both components are important in determining fire behavior. The effect of live fuels and their

current moisture content on spread rate and intensity is strong and depends on the relative amount of grass and

shrub load in the fuel model.

GS1 – Low Load, Dry Climate Grass-Shrub (Dynamic)

GS2 – Moderate Load, Dry Climate Grass-Shrub (Dynamic)

GS3 – Moderate Load, Humid Climate Grass-Shrub (Dynamic)

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Shrub Fuel Type Models (SH)

The primary carrier of fire in the SH fuel models is live and dead shrub twigs and foliage in combination with dead and down shrub litter. A small amount of herbaceous fuel may be present, especially in SH1 and SH9. The effect of

live herbaceous moisture content on spread rate and flame length can be strong in the dynamic SH models.

SH1 – Low Load, Dry Climate Shrub (Dynamic)

SH2 – Moderate, Load Dry Climate Shrub

SH3 – Moderate Load, Humid Climate Shrub

SH4 – Low Load, Humid Climate Timber-Shrub

SH5 – High Load, Dry Climate Shrub SH6 – Low Load, Humid Climate Shrub SH7 – Very High Load, Dry Climate Shrub

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Timber-Understory Fuel Type Models (TU)

Primary carrier of fire in the TU fuel models is forest litter in combination with herbaceous or shrub fuels. TU1 and TU3 contain live herbaceous load

and are dynamic.

TU1 – Low Load Dry Climate Timber-Grass-Shrub (Dynamic)

TU2 – Moderate Load, Humid Climate Timber-Shrub

TU3 – Moderate Load, Humid Climate Timber-Grass-Shrub (Dynamic)

TU4 – Dwarf Conifer with Understory

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Timber Litter Fuel Type Models (TL)

The primary carrier of fire in the TL fuel models is dead and down woody fuel. Live fuel, if

present, has little effect on fire behavior.

TL1 – Low Load Compact Conifer Litter

TL2 – Low Load Broadleaf Litter

TL3 – Moderate Load Conifer Litter

TL4 – Small Downed Logs TL5 – High Load Conifer Litter

TL6 – Moderate Load Broadleaf Litter

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Slash-Blowdown Fuel Type Models

(SB)

SB1 – Low Load Activity Fuel

SB2 – Moderate Load Activity Fuel or Low Load Blowdown

SB3 – High Load Activity Fuel or Moderate Load Blowdown

SB4 – High Load Blowdown

The primary carrier of fire in the SB fuel models is activity fuel or blowdown. Forested areas with heavy

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• _GTR-153

–

_{Photos, descriptions, selection guide,}

crosswalk, fire behavior charts

–

_{Electronic and printed formats}

• _{http://www.frames.gov}

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Helpful Tools

• _GTR-153

• _{Help file}

–

_{Searchable, hyperlinked}

–

_{GTR-153 content included}

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Helpful Tools

• _{Printed GTR}

• _{Help file}

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Two-step process

• _{Initial selection}

–

_{Selection guide}

–

_Crosswalk

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Two-step process

• _{Initial selection}

–

_{Selection guide}

–

_Crosswalk

–

_{Rule/algorithm}

–

_Experience

• _{Fire behavior simulation}

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Now we’ll work through some examples of various

fuel models.

(Note - Trying to focus on and be similar to the classroom module in 390 that already exists for the 13 fuel models – showing picture examples as

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