Ignition Pattern 2
Ignition Pattern 2 : The manner in which a prescribed burn, backfire, or burnout, is set, determined by weather, fuel, ignition system, topographic and other factors having an influence on fire behaviour and the objective of the burn. Several methods are commonly used: Angled Strip Ignition: The setting of a number of lines of fire on an area at an angle to the wind. The effect is to create lines of fire with attributes of both a head fire and a flank fire. Somewhat similar to maple leaf ignition, except that the angled strip method is normally used on flat or uniform terrain whereas the maple leaf method is intended for hilly areas. Area Ignition: The setting of a number of individual fires throughout an area either simultaneously or in quick succession and so spaced that they soon coalesce, influence, and support each other to produce a hot, fastspreading fire throughout the area. Area Grid Ignition: The setting of a number of individual fires throughout an area so spaced that they will spread independently over most of the area before finally reinforcing one another. (In Ontario referred to as spot ignition). Backfire Ignition: The setting of a line of fire so that it will burn away from a control line against the wind or downhill. (In Ontario referred to as a single strip backfire). Note: Strip Fire Ignition. Centre Fire Ignition (Centre Firing): The setting of fires in the centre of an area or concentrated to create a central convection column with additional fires set progressively and less concentrated near the outer control lines. As indrafts develop they draw the fire toward the centre. Syn: Convection Burning. Flank Fire Ignition: The setting of a line of fire along a line parallel to the wind with the fire spreading at right angles to the wind or across a slope. (In Ontario referred to as a single strip flank fire). Note: Strip Fire Ignition. Head Fire Ignition: The setting of a line of fire so that it will burn with the wind or upslope away from a control line. (In Ontario referred to as a single strip head fire). Note: Strip Fire Ignition. Maple Leaf Ignition: The setting of lines of fire progressively from the apex of a ridge point and proceeding downhill. Used in hilly areas to burn knolls or ridges where slope is the main influence on fire spread. The effect is to have flank fires radiating from the central hilltop. (In Ontario referred to as a radial strip flank fire). Syn: Chevron Ignition (used mainly in the United States). Note: Angled Strip Ignition and Strip Fire Ignition. Perimeter Fire Ignition (Perimeter Firing): The setting of a series of fires or a line of fire around the perimeter of an area and allowing the fire(s) to burn toward the centre of the area. May or may not involve centre firing. Typically, fires are set first on the downwind side to produce a backfire, then along the sides of the area to produce flank fires, and then on the upwind side to produce a head fire. Strip Fire Ignition: The setting of successive parallel strips of fire (progressing outward toward the perimeter of the area), each one burning adjacent to the strip previously burned. May be used for backfires, flank fires, or head fires. (In Ontario referred to as multiple strip backfire, multiple strip flank fire, or multiple strip head fire)
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