40 Scott and Burgan Fire Behavior Fuel Model (FBFM40) represents distinct distributions of fuel loading found among surface fuel components (live and dead), size classes, and fuel types.
This set contains more fuel models in every fuel type (grass, shrub, timber, slash) than Anderson's set of 13. The number of fuel models representing relatively high dead fuel moisture content increased, and fuel models with an herbaceous component are now dynamic, meaning that loads shift between live and dead (to simulate curing of the herbaceous component) rather than remaining constant.
LANDFIRE's (LF) FBFM40 was evaluated through a series of workshops held across the nation with fire and fuels specialists. Workshop participants reviewed and adjusted surface fuel model rulesets using unique combinations of Existing Vegetation Type (EVT), Existing Vegetation Cover (EVC), Existing Vegetation Height (EVH), and in some cases Biophysical Setting (BPS).
Annual Disturbance products were first incorporated into fuel production during LF 2008. The introduction of this information allowed for informed changes to the assigned fuel models from disturbance type, severity, and time since the disturbance.
LF Remap incorporates Fuel Vegetation Type, Fuel Vegetation Cover, and Fuel Vegetation Height in place of EVT, EVC, and EVH in fuel model assignment. The fuel vegetation products are pre-disturbance at disturbance locations and EVT at non-disturbance locations. The assignment of fuel models is informed by pre-disturbance vegetation and type, severity, and time since disturbance.
The FBFM40 product can serve as input to wildland fire prediction models.
LF Remap FBFM40 has "capable fuels" functionality, meaning FBFM40 is assigned using FDist capable fuels.
Modeling Dynamic Fuels with an Index System (MoD-FIS) - refined EVH classification based upon current estimates of EVC from Landsat imagery for the current growing season.