Automatic modeling and visual analysis of fluvial evolution in virtual environment

The 3 D virtual simulation technology has changed the way to traditional sense of the world and provided a friendly and high degree of immersion for experts and scholars.It is introduced together with the scientific visualization technology into the sediment research to propose the overall framework of the 3 D visualization system of sediment erosion and deposition based on virtual reality technology.The system realizes the virtual representation of the real watershed,4 D temporal and spatial changes of large-scale river erosion and deposition process in virtual environment and visual analysis of cross-section form change.Several techniques,including the river boundary identification,automatically adaptive modeling of river channel evolution,seamlessly nested modeling between dynamic river and the surrounding watershed scene,Levels of Detail(LOD) of river channel and seamlessly tiling of LOD patches,display mode and control mode for temporal and spatial visualization,interacting with dynamic river channel,extracting the section based on local interpolation,et al.,used in the system are proposed and studied.These techniques are proved to be practicability and feasibility with the Three Gorges Project as an example.