耦合Rothermel模型与粒子系统的林火蔓延模拟方法北大核心CSCD

科学准确地模拟分析森林火灾蔓延动态对防灾减灾救灾工作具有重要意义。现有的林火蔓延模拟方法在林火蔓延计算和可视化表达上,耦合程度低且难以将动态物理模型计算结果实时可视化表达。针对这一问题,本文在综合考虑国内外各种火灾蔓延模型优缺点的基础上,选取应用广泛的Rothermel模型作为物理模型。通过惠更斯理论优化了火灾演进范围边界点割裂的不足,采取着火点密度阈值控制种子点数量与模拟可视化效率的平衡;利用布尔运算提高多着火点蔓延范围计算效率,将火灾模型与Open Scene Graph的粒子系统进行紧密耦合,完成火灾演进可视化表达。本文方法实现了对森林火灾蔓延的精确计算和实时、逼真模拟,为灾害应急部门提供信息化支撑。

A forest fire spread simulation method of coupling Rothermel model and particle system

The scientific and accurate simulation of forest fire spreading process is of great significance for disaster prevention, mitigation and relief work.Existing simulation algorithms for forest fire spread has low coupling degree in calculation of fire spread and visualization expression method, and it is difficult to visually express the calculation results of dynamic physical model in real time.In response to this question, this paper comprehensively considers the advantages and disadvantages of various fire spread models, and selects Rothermel model which is the widely used as the physical model.The Huygens theory is used to optimize the boundary points in fire evolution range and the ignition density threshold is used to control the balance between the number of seed points.Using Boolean operation to improve the calculation efficiency of multiple ignition point spread range, the fire model is closely coupled with the particle system of Open Scene Graph to complete the visual expression of fire evolution.It realized the accurate calculation and real-time, realistic simulation of forest fire spread, and provides information support for disaster emergency departments.