| 基于粒子系统的滑坡灾害过程模拟仿真方法 |
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| 引用本文： | 杜志强,李静.基于粒子系统的滑坡灾害过程模拟仿真方法[J].地理信息世界,2017,24(2). |
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| 作者姓名： | 杜志强 李静 |
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| 作者单位： | 1. 武汉大学 测绘遥感信息工程国家重点实验室,湖北 武汉 430079;地球空间信息技术协同创新中心,湖北 武汉 430079;香港中文大学 太空与地球信息科学研究所,香港 999077;2. 武汉大学 测绘遥感信息工程国家重点实验室,湖北 武汉,430079 |
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| 基金项目： | 国家自然科学基金项目，国家高分辨率对地观测系统应用系统建设项目 |
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| 摘 要： | 传统滑坡模拟方法需要进行大量物理模拟计算,导致模拟效率低且模拟精度受制于所采用的力学模型。本研究在传统模拟方法的基础上引入PhysX物理引擎中的粒子系统模拟滑坡发生的整个过程,简化了传统模拟方法的大量物理模拟计算过程,提高了模拟效率。首先采用参数率定以及极限平衡分析方法计算滑坡灾害体的物理属性值及几何属性值,并将其转化为粒子属性,其次在物理引擎中通过控制模拟时间及粒子周期模拟滑坡灾害过程,最后通过粒子系统反馈回的滑坡粒子的几何位置、持续时间和个数等要素的统计计算得到滑坡灾害范围。选取浙江丽水市滑坡为典型案例,验证了本文方法的可行性与可靠性。
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| 关 键 词： | 粒子系统 滑坡 仿真 减灾 |
Landslide Disaster Simulation Method Based on Particle System of PhysX |
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| Abstract: | Traditional simulation method about landslide required a lot of physical calculations, resulting in low efficiency and uncertain simulation accuracy depended on the mechanical model used. This paper introduces the particle system of the PhysX to the traditional simulation method to simulate landslide, which simplifies physical calculation of traditional method and improves the efficiency of the simulation. Firstly, the physical properties values and the geometry of the landslide disaster are calculated based on the parameter calibration and the limit equilibrium method. Then convert them into the particle properties, the landslide in the PhysX system by controlling the simulation time and the lifetime of the particle are simulated. Finally, according to several elements such as the geometry position of a series of particles and the last time fed back by the particle system, some statistics to derive the time and the area of the landslide region are calculated. As a typical case, the simulation of Lishui landslide in Zhejiang province proved the feasibility and reliability of this method. |
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| Keywords: | particle system landslide simulation disaster reduction |
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