A simple physics-based mathematical model is developed for prediction of the propagation of a grass-fire front driven by an ambient wind and by entrainment winds generated from one or moreburning structures. This model accounts for the heterogeneous nature of the burning in a particular wildland-urban-interface (WUI) setting, where the entrainment from fundamentally three-dimensional structure-fire plumes can change the propagation of a two-dimensional ground-fire front. Data on grass and structure fires are presented and compared to justify the model. Scaling effects on the fire-front propagation-speed are given as afunction of the location of the front, of the heat release rate of a single burning structure, of the total number of burning structures and of the burning-structure density. Also, detailedfront propagation changes due to a single and multipleburning-house scenarios are presented.
Citation: Canadian Journal of Forest Research-Revue Canadienne De Recherche Forestiere
Pub Type: Journals
burning structures, fire research, grass fires, heterogeneous burning, mathematical model, model of fire propagation, physics-based model, plume-entrainment wind, wildland-urban interface