Abstract: The rendering of flood evolvement simulate system includes 3D landform modeling and real-time rendering to landform and physiognomy. The key technology of the dynamic simulate of the original flood evolvement is the design of the self-control search model of the boundary of the watercourse’s drainage area. Using the breadth-first search(BFS) and the watercourse self-control search(WSS) as primary arithmetic, visual C++ 6.0 as platform and OpenGL as graphics program interface, and taking the process of lake water level rise for example, an original-flood evolvement simulate system based on the 3D landform sight is developed. The dynamic system can simulate the process of water level rise in lake basin and water overflow at the exit of lake basin during the period of water level of lake rising and boosting. Also it can simulate the flowing direction of water along watercourse after it overflows the exit of a lake basin.

Key words: flood evolvement, original flood, spreading flood, breadthfirst search(BFS), watercourse self-control search