n. Heat flux
available for fire front propagation.
Propagating flux is the amount of heat (per
unit area and per unit time) available for fire front propagation. It
is a term in the Rothermel (1991) fire spread model.
Units for propagating flux are the same as those
for reaction intensity. In the original model, propagating flux is given
in BTU/(ft2-min), but BTU/(ft2-sec) are also common. Preferred metric
units are kW/m2.
Propagating flux conversion
Systems for Environmental Management