林缘点烧火行为指标分析

ANALYSIS OF FIRE BEHAVIER INDEX FOR PRESCRIBED STRIP BURNING IN FOREST FRINGE

在林缘试点烧同时，测得当时天气条件下空气温度ｔ（℃）、相对湿度ｒ（％）、风速ｓ（ｍ／ｓ）３组主要因子和点烧后火蔓延到１０、２０、３０、４０ｍ处时线速度Ｖ（ｍ／ｍｉｎ），火焰高度Ｈ（ｍ），并估算了火强度Ｉ（ｋＷ／ｍ）。经相关分析，获得Ｖ、Ｈ、Ｉ与ｔ、ｒ、ｓ之间一元非线性和多元回归经验方程，结果与杨美和等￣［５］对林外干草地火行为指标回归分析趋势一致。

A series of prescribed strip burning experiments in forest fringe were carried out.In process of a strip burning experiment the flame linear velocity V(m/min) and flame height h(m) were recorded as soon as the fire spread to 10,20,30 and 40 meters away.At the same time,the temperature t(℃),relative humidity r(%) and wind velocity s(m/s) were also recorded.In order to find out the effection of t,r and s on V,H and estimated fire intensity I,several univariate nonlinar equations and mutivariate regression equations between V,H, I and t,r,s were obtained by correlation anylasis.The results were accordant with those derived from the same experiments in dry grass land outside forest stands by Yang Meihe.