论文部分内容阅读
结合火场能量平衡的半经验模型与地面温度场的物理模型，为火场扩展提供实用描述工具．森林火场扩展形势取决于燃烧物特性和气象气候因子以及地形的作用．森林可燃物本身（表面积）无特征尺度，而林火的扩展过程具有自复制性，这两者使火场扩展具有自相似性，因而火行为可用分形几何进行描述．研究中选取大兴安岭林区五岔沟林火作为试验区，在低分辨率的ＮＯＡＡ－ＡＶＨＲＲ图像上发现火场，在相应高分辨率的ＴＭ图像上进行火场扩展模拟，这是一种新的信息融合尝试．在遥感和地理信息系统的支持下，采用描述生长现象的有限扩展集聚（ＤＬＡ）方法来模拟林火动态扩展过程，用标度律对森林火场的模拟结果进行形态控制．模拟火场与实际火场在形态上体现了自相似，火场面积在数量上也十分接近．
Combining the semi-empirical model of the energy balance of the fire field and the physical model of the ground temperature field, a practical description tool for the expansion of the fire field is provided. The expansion of forest fires depends on the characteristics of the flammables and meteorological and climatic factors as well as the role of the terrain. Forest fuel itself (surface area) has no characteristic scale, while the expansion process of forest fire is self-replicating. Both of them make self-similarity of fire extension, so the fire behavior can be described by fractal geometry. In the study, Wuchagulin forest fire in Daxinganling forest area was chosen as the experimental area, fire scene was found on low resolution NOAA-AVHRR image and fire propagation simulation was performed on corresponding high-resolution TM image, which was a new information fusion try. With the support of remote sensing and geographic information system, the DLA method is used to simulate the dynamic expansion of forest fires and the scale control law is used to control the simulation results of forest fires. Simulated fire and the actual scene in the fire reflects the self-similar, the fire area is also very close in number.