Abstract: After the construction of Three Gorges Reservoir，river-crossing bridges in construction at the reservoir area become more and more. In order to reduce or avoid the ship-bridge collision，the mathematic model of ship’s off-course influenced by the wind and stream in bridge navigable waters is established，from the perspectives of ship driving and collision avoiding. Zhongxian Yangtze River Bridge located in Shi-Zhong highway is taken as the research object and the ship controlling theory is used in this model. And the ship motion track in the bridge navigable waters is simulated by the simulation technology，which shows three-dimensional view of ship getting through the bridge. The proposed mathematic model provides theoretic basis for river-crossing bridges in Three Gorges Reservoir area to take the initiative measures to prevent collision.

Key words: ship, bridge navigable waters, motion model, simulation

摘要： 三峡成库后，库区在建跨河桥梁日渐增多，为避免或减少船桥碰撞事故，从船舶驾驶与避碰的角度，以石忠高 速公路忠县长江大桥为研究对象，运用船舶操纵理论，建立船舶在桥区水域受风、流影响偏航数学模型，并通过仿 真技术模拟船舶在桥区河段运动航迹，显示船舶通过大桥上下行三维视景，为研究三峡库区跨河桥梁主动防撞提 供理论依据。

关键词: 船舶, 桥区河段, 运动模型, 仿真