地表火蔓延的真实感仿真

Surface fire spreading simulation with realistic impression

地表火蔓延的计算机仿真在火灾的扑救、预防及评估等方面具有重要的应用价值。现有的研究大多偏重于火焰蔓延的数值模拟和简单可视化,影响了人们对火灾蔓延的直观认识和临场感。提出了一种基于图形绘制技术的地表火蔓延的真实感仿真技术。首先,根据地表火蔓延的物理规律,并考虑到地形、气候和可燃物等因素的影响,提出了一种基于Rothermel模型的地表火随时间变化蔓延的建模方法。然后,采用基于GIS地形数据和高程图绘制相结合的方法绘制场景地形。再改进传统的粒子系统绘制技术对火焰进行真实感绘制。该方法可以通过变化不同的参数而富有真实感地再现不同环境条件下地表火蔓延场景,能够为灭火决策提供依据。最后,文中给出了不同条件下地表火场景的绘制结果。

Simulation of fire spreading can be found to have wide applications in disaster rescue,prevention and assessment,etc.Previous works focused on the numerical analysis of fire spreading,which was not realistic and influenced the user＇s understanding of this phenomenon.This paper proposes a novel method for realistic simulation of fire spreading based on computer graphics techniques.First,the spreading of fire on terrain is simulated based on Rothermel model considering the impact factors of the terrain,weather conditions,and so on.Then,terrain gragh was obtained based on GIS data and elevation map.3D fire is displayed by improving the classical method of particle systems.This method can be used for realistic simulation of surface fire spreading scenes under different environment conditions.The paper gave various graph results to illustragte the method.