Abstract: The traditional channel surveying and mapping information management and fusion technology is insufficient, and it is difficult to fully reflect the impact of the natural geographical environment, facilities and buildings on the water safety. Aiming at the problem of damage and missing of the reality 3D model of waterway, this paper introduces a multi-scale level set image segmentation method, that automatically initialized with the buffer image of hole, so as to obtain the accurate channel water area range by fast iterative segmentation, and further restrict the reality 3D model reconstruction and model singleization. This method is verified in the construction task of reality 3D channel map of Wangjiatan demonstration section of Yangtze River in Changshou District, Chongqing. Compared with the traditional model repairing and singleization method, the experimental results show that the technical method proposed in this paper is effective, which significantly improves the optimization efficiency of reality 3D model of waterway, and supports the safety management of waterway operation.

Key words: channel, reality 3D, level set, singleization, model reconstruction