基于计算机图形技术的林火蔓延模型

目前用于模拟林火蔓延的模型主要是相邻单元模型和波传播模型,他们的优缺点具有明显的互补性.本文基于计算机图形技术,考虑已有模型的优点,设计了一个新的蔓延模型.本文介绍了新模型的设计方案与实现方法,以及影射变换,拓扑关系的解决方案.研究了它们的优缺点以及火线的失真等问题.通过理论分析和案例研究,新模型大大改进了林火蔓延的计算机模拟过程,因此本模型可不受地理环境和火行为复杂性的限制,提供林火发展的实时全景图象.

A Spread Model for Forest Fire Based onComputer Graphic Techniques

Two spread models frequently used for forest fire simulation, namely the contiguous cellular model and the wave propagation model, strongly complement each other in their advantages and disadvantages, this is utilized in this paper to design a spread model based on computer graphic techniques, assimilating the advantages of the former on the basis of the latter. The paper presents design scheme and implementation method of the new model, including solutions to topology relation and projection transformation. Its advantages and disadvantages on performance, including effect on local distortion and aberration of the fire line, are studied. By theoretical analysis and a case study, it is deduced that the new model greatly improves the performance of computer simulation for forest fire spread so that it can provide forest fire fighters with precise, overall diagrams of fire development in real time, unrestricted by complexities of fire behaviors or geographical elements.