数字长江河道试验---以南京以下长江河道为例

Digital Changjiang River Course is the primary part of digital Changjiang River Basin. The solution of construction of Digital Changjiang River Course relates to lots of issues such as fast data collection of Digital Changjiang River, construction of 3D simulation models on the water dynamic model, Sand trasportation model and Geomorphological Change model in the rivercaouse, integration of these models and GIS, 3D visualization of the river course, and creation of virtual environment system based on Internet etc. This research emphasizes in detecting the application of satellite remote sensing technology in monitoring the changes of the depth and the bank of the Changjiang River, building a underwater-terrain database of 10-phase of the Changjiang River Course. In this research, we have a deep quantitive research into terrain changes of the Changjiang River Course since last 50 years, build a evolvement model on the Changjiang River Course based on Geospatial statistic method. In addition, we make several models on 3D water dynamic model, water quality diffusion and sand transpotation model, solve the problem of grid automatic creation based on GIS, make the rectangle grid creator, restricted unit grid creator and cross-curve grid creator, work out some key techniques in the integration of GIS and distributed geographical models, adopt the idea of web service to create the virtual GIS on the base of Web GIS, set up a simulation support system, which has the interactive functions to regulate the conditions of the boundary, hydrology and sand and man-made engineerings.

利用我国资源卫星数据完善南京以下长江河道数据库，研究长江枯水期利用小卫星数据进行河道地形快速更新的方法。在GIS的支持下研究长江河道及岸线的演变规律，建立基于时间蛄泻退ρУ暮拥姥荼淠Ｐ停唇ê拥篮樗涨椋ㄌ丁⒐苡浚┯氚断弑浠魇圃げ獾男槟夥抡婊肪常迪諫IS、分析模型、科学计算可视化与虚拟现实系统的集成，再现过去长江洪水险情场景和河道变化的动态过程，预测不同边界条件、水沙条件和人工控制条件下可能出现洪水险情的位置以及对岸线变化的影响。利用虚拟实验室技术，通过Internet 实现对碛布褪莸墓蚕怼