基于温度场动态变化的林火蔓延模型研究

为了提高林火蔓延模型的准确性和通用性,文中把火场看作一个动态温度场,并从火场上任一微元体任一时刻温度变化状态出发,应用能量守恒定律,建立火灾区域温度场动态变化模型.经差分处理,得到进行模拟计算的一组温度场计算方程;由边界点条件,求出边界点的集合后,拟合得出火线函数,积分后可得到时刻火场的过火总面积、火线长度和火场形状,同时进一步证实了对流传热方式是影响林火蔓延的主要因素.从广州市8宗森林火灾的蔓延模拟结果看,过火面积的模拟精度约90%,能较准确地模拟林火发生时的过火面积和火线长度.

Study of Forest Fire Spreading Model Based on Dynamic Temperature Field

In order to increase the accuracy and the widely use of fire spreading model,the paper base on the change state of temperature of the calculus on fire area,use the law of energy conservation,it can give the change of the temperature field's Mathematical model on the fire area.The model can be made into difference equation of the temperature field that can be used to simulate calculation;then we can get the set of edge point,and we can have the function of the fire line, and we can also have the burned area,the length of fire line and the space of fire area;it also come to the conclusion that the main factor of forest fire is convection heat transfer.From the result of simulate calculation the Guangzhou's eight times forest fire,the accuracy of simulated fire area is more than 90 percent,so the model can simulate the fire area and the length of the fire accuracy.