NFFL 4 |
|
|
|
|
|
Model Name: |
"Brush" |
|
|
Fuel Model Number: |
4 |
|
|
Source: |
NFFL Standard Model |
|
|
Reference: |
Anderson, 1982 |
|
|
Description: |
||
|
This model was eliminated from use in the Santa Monica Mountains fuels data because it seriously overpredicts the rate of spread observed during historical fires through chaparral. NFFL 4 is still useful as a worst-case measuring stick of fire behavior in chaparral during Santa Ana wind events. For more information on why NFFL 4 should not be used as an accurate indicator of fire spread outside of such extreme situations go here. |
||
|
FuelModelNum |
D1H |
D10H |
D100H |
LH |
LW |
DSAV |
LHSAV |
LWSAV |
FuelBedDepth |
MoistOfExtinct |
DHC |
LHC |
IsNFFL |
|
4 |
11.23 |
8.99 |
4.51 |
0.00 |
11.21 |
60.56 |
0.00 |
45.42 |
182.88 |
20 |
18608 |
18608 |
Yes |
|
FuelModelNum |
MODEL NUMBER IN COVERAGE - NFFL MODEL NUMBERS ARE STANDARDIZED |
- |
|
D1H |
ACCUMULATED DEAD 1 HOUR FUELS |
Mg/ha |
|
D10H |
ACCUMULATED DEAD 10 HOUR FUELS |
Mg/ha |
|
D100H |
ACCUMULATED DEAD 100 HOUR FUELS |
Mg/ha |
|
LH |
ACCUMULATED LIVE HERBACEOUS FUELS |
Mg/ha |
|
LW |
ACCUMULATED LIVE WOODY FUELS |
Mg/ha |
|
DSAV |
DEAD FUELS "CHARACTERISTIC" SURFACE AREA TO VOLUME RATIO |
cm2/cm3 |
|
LHSAV |
LIVE HERBACEOUS FUELS "CHARACTERISTIC" SURFACE AREA TO VOLUME RATIO |
cm2/cm3 |
|
LWSAV |
LIVE WOODY FUELS "CHARACTERISTIC" SURFACE AREA TO VOLUME RATIO |
cm2/cm3 |
|
FuelBedDepth |
FUEL BED DEPTH (70% of Average Stand Height) |
cm |
|
MoistOfExtinct |
MOISTURE OF EXTINCTION OF DEAD FUELS |
% |
|
DHC |
DEAD FUELS HEAT CONTENT |
kJ/kg |
|
LHC |
LIVE FUELS HEAT CONTENT |
kJ/kg |
|
IsNFFL |
IS THIS A STANDARD NFFL FUEL MODEL OR CUSTOM MODEL DEVELOPED FROM BEHAVE |
- |
|
|
|
|
Chaparral Environmental Regimes Used In Fire Spread Predictions
|
Property |
ModerateConditions |
ExtremeConditions |
|
Dead 1 Hour Fuel Moisture |
0.08 |
0.02 |
|
Dead 10 Hour Fuel Moisture |
0.09 |
0.04 |
|
Dead 100 Hour Fuel Moisture |
0.11 |
0.05 |
|
Live Herbaceous Fuel Moisture |
1.50 |
0.90 |
|
Live Woody Fuel Moisture |
1.10 |
0.70 |
|
|
||
|
Source: |
||
|
Notes: |
||
|
Fuel Moisture content values are given on a dry weight basis. |
||
|
Wind magnitude (speed) was varied from 0 m/s to 10 m/s. Magnitudes in the upper range are meant to mimic Santa Ana conditions. |
||
|
Slope was varied from 0% to 100%. At 100% slope there is a 1 meter change in vertical elevation for every 1 meter of horizontal distance. |
||
|
Wind magnitude (speed) in slope trials was set to 0 m/s. |
||
|
|