大范围流域内水体三维仿真研究

建设数字流域的一个重要方面是利用数字流域水文地理信息平台建立起洪水演进仿真模拟系统。文章以大范围流域内的水体仿真为研究对象,详细描述了三维水体仿真的快速傅立叶变换(FFT)模型,并给出FFT模型的计算机实现方法及流程。在水体的三维仿真方面,借鉴大地形仿真技术,提出了水体仿真的细节层次技术和无缝拼接技术,并最终将研究结果应用于清江流域的可视化仿真系统。

Research of Water Simulation in Large Drainage Area

One important aspect of constructing digital drainage area is to set up the flood routing simulation system based on the GIS platform of digital drainage area. This paper focuses on the simulation of the water in large area. The FFT model for 3D water simulation is described in detail, and the procedure of implementing the FFT model on computer is also given. Drawing lessons from the implementing of large scale terrain visualization, some technologies to render the 3D scene such as level of detail (LOD) and seamless stitching of units are presented and discussed together with test results. And these technologies are eventually applied to the 3D visual simulation of the Qingjiang drainage area.