【作者】 陈文辉；

【导师】 董朝霞；

【作者基本信息】 华中科技大学 ， 水利水电工程， 2004， 硕士

【摘要】 目前,计算机图形学领域的三维图形仿真技术有了长足的进步,大地域范围内的三维场景实时仿真已经成为可能。本文将仿真技术应用于洪水预报与演进领域,搭建起虚拟的洪水演进仿真环境,将现有洪水预报模型的预报预测结果以三维图形形式输出,为防洪决策制定提供强有力的支持。作为洪水仿真的重要模拟对象,水,在计算机图形学中有多种仿真手段。本文详细介绍了Gerstner Waves、快速傅立叶变换(FFT)及Perlin Noise这三种水体仿真模型,并对FFT模型进行了深入的分析及应用研究,结合流域洪水仿真的实际情况以及当前计算机的性能限制,提出了针对FFT水体模型的LOD、无缝拼接、裁剪及高程变化等一系列改造方案,通过实验比较,给出了适合于模拟流域洪水的模型参数。除了水体仿真,本文还简要介绍了目前大地形可视化仿真的方法及数据需求。介绍主要针对数字地面模型(DTM)展开,同时还涉及到地形场景多分辨率模型。在这些理论背景下,本文使用Vega三维仿真软件对清江流域洪水演进做了合理的应用。文中详细地阐述了该仿真环境的构架,功能及方案设计。对于实际项目实施过程中出现的关键问题给出了适当的解决方法。最后,本文对项目所做的实际工作予以总结,提出了系统的创新点及不足之处,对不足之处提出了改进意见,并对未来的数字流域洪水演进仿真系统予以展望。更多还原

【Abstract】 Nowadays, 3D simulation technology of the Science of Computer Graphics has been promoted quite much, and large area 3D terrain simulation for real-time rendering has been coming true. Simulation technology is integrated with flood forecast and flood routing in the thesis. A flood routing simulation application is implemented, which forecast results based on some forecast models are displayed in 3D ways, and can provide strong support for anti-flood decision.Water, the most important object of the flood simulation, can be emulated in several different ways in computer graphics. Gerstner Waves, FFT model and Perlin Noise are introduced in the thesis, and FFT model is particularly analyzed. Research has been made to adapt the FFT model to computer’s performance according to the conditions of valley flood including LOD, seamless stitching, cutting out and elevation varying. Some experiments have also been made to figure out the parameters of the model which are suitable for the simulation of valley flood.Besides the simulation of water, the method and data requirement of simulating the terrain of large areas are also introduced in the thesis. DTM is discussed, particularly, terrain multi-resolution representation is introduced.With all these theories, a project has been implemented based on Vega, 3D simulation software, to simulate the flood routing progress of the QingJiang River. The framework, design and functions of the project are described in details. Some problems that arose during the procedure of implementing are finally solved.A summarize for the work of the project is the final part of the thesis. Innovation and shortage are pointed out for later implementing of the project, prospect of simulation in the field of digital-drainage-area is also presented.更多还原