Abstract:

The process of forest combustion was very complex. The characters of the forest fuel were showed through fire behavior. In the world, there are a lot of researchers to study fire behavior for many years, and they have made a great progresses on some aspects, such as fire spot range (perimeter or area),flame characters, fire intensity and fire spreading. Fire intensity, flame height and fire spreading are basic characters of the fire behavior. The fire environment directly affects fire behavior.Fire behavior of forest burning was a series of reactions from catching fire, spread to weakening and dying. Fire behavior was the result of all reactions, and it was showed with the fire spreading, fire area enlarging (perimeter or area), fire intensity amplifying and other extreme forest fire behavior, such as spot fire, high intensity fire (thre- dimension). Fire intensity, flame height and the speed of fire spreading were main indexes of fire behavior characters. Fire behavior, flammability and number of the fire spots were also influenced by fire environment.

Key words: Forest fire, Fire behavior, Flame, Fire intensity, Fire spread