【摘要】 本文基于VC++和三维视景软件包OpenGVS开发了汶川地震灾区堰塞湖溃决洪水淹没过程三维可视化系统。探讨了事件动态对象的建模方法和河道边界的搜索算法,并设计了可视化仿真平台与水动力学模型交互的数据接口。采用三维地形生成软件Terra Vista和Multigen Creator,集成DEM、遥感影像、矢量数据生成了灾区大范围三维场景,对重点水利工程和堰塞湖区域进行了精细建模。系统集成二维溃坝水流模型和在线监测数据,实现了实时遥感影像的三维可视化和堰塞湖的空间分布显示、唐家山堰塞湖的蓄水过程的模拟及溃决洪水演进过程的可视化动态仿真。结论表明,该系统形象直观地展现了堰塞湖的蓄水过程和洪水演进的三维效果,而且对流场进行了虚拟表达,为检验水流模型的准确性提供了参考和依据,也为下游城市进行科学的防洪决策提供了崭新思路和可靠的技术支持。更多还原

【Abstract】 A three-dimensional(3-D) visual simulation system of outburst flood propagation is developed for the Tangjiashan barrier lake in the Wenchuan earthquake stricken areas based on VC + + and OpenGVS.Several key techniques,including methods of dynamic modeling,algorithm for searching river borders,and designation of data interactive interface between the hydrodynamic model and visual simulation platform,are used in the system.This system generates a virtual environment for the earthquake areas by using software Terra Vista and Multigen Creator to integrate the digital elevation model,remote sensing images and vector data,and finely models the key water conservancy projects and the barrier lake regions.By integrating the two-dimensional shallow water model and the on-line monitoring data,it achieves the real-time 3-D visualization of remote sensing images and the spatial distribution of barrier lakes.It presents a visual dynamic simulation of the water impounding and the outburst flood in the Tangjiashan barrier lake.Conclusions show that the system can visually display the details of water impounding and can realize 3-D visual simulation of the outburst flood dynamic behaviors,and that it can also represent the flow field in its virtual environment.Thus it provides a useful tool for accuracy test of hydrodynamic model,and also a new approach or reliable technical support to flood control and warning for the downstream cities.更多还原