长时间尺度珠江口河网水下地形演变过程三维可视化实现及分析  

3-D visualization and analysis for underwater terrain evolution ofthe Pearl River estuary networks in long-term span

作　　者：杜国明[1] 陈晓翔[1] 吴超羽[1] 刘秋海[1] 任杰[1] 

机构地区：[1]中山大学地理科学与规划学院,广东广州510275

出　　处：《水科学进展》2005年第2期181-184,共4页Advances in Water Science

基　　金：国家重点基础研究发展计划(973)资助项目(2002CB412407);中山大学青年教师科研启动基金资助项目;"985工程"GIS与遥感的地学应用科技创新平台~~

摘　　要：阐述了长时间尺度珠江口河网水下地形演变过程中的三维可视化实现过程及空间分析方法,进一步揭示了珠江口河网水下地形演变机理。将收集的地形图进行数字化,建立不规则三角网,实现三维可视化,并在此基础上进行剖面分析,为不同年份的地形比较从而揭示珠江河网水下地形演化过程奠定基础。针对遇到的高程值转换问题,介绍了零值线法,采用点射线法作为判断依据达到高程转换的目的,同时针对该方法工作量大等不足,提出了字段标识法这一行之有效的方法。In order to further show the underwater terrain terrain evolution mechanism of the Pearl River networks, we employ the techniques of 3-D visualization and spatial analysis. The comparison with 3-D data of different period will help to expose the underwater terrain evolution and forecast the trend of the evolution of the Pearl River estuary. In addition, in view of the problem of the elevation value rectified, we present the methods of zero-value-line and the field identification. The method of zero-value-line is based on that of point radial. But this method exists the disadvantages, such as the extra computation. The method of field identification is proved to be an efficient method.

关 键 词：三维可视化 高程值转换 零值线法 字段标识法 长时间尺度 地形演变 珠江口河网 

分 类 号：TV147[水利工程—水力学及河流动力学]