关键词: 桥群河段, 航道整治, 安全保障措施

Abstract: The layout of the bridge such as bridge site，the bridge spacing and span significantly affect navigation conditions of bridge group reach of the mountain river． The navigation environment of Caiyuanba Bridge group reach of Yangtze River is complex． Based on the model test，the flow condition for navigation，ship maneuvering characteristics are analyzed by the time when the bridges are completed． It is indicated that the effect of Shibanpo Bridge on the bridge group reach of Yangtze River is relatively greater，where the navigation condition is poor caused by the narrow and curved channel，as well as the insufficient navigation clearance． The main navigable hole of Caiyuanba Bridge pasts across the navigable waterway，but it is close to Shibanpo Bridge． So the descending vessels should promptly adjust the direction and position after through Caiyuanba Bridge to prepare for passing the next bridge． To ensure the safety of navigation，the security measures of bridge group should be considered overallly．

Key words: bridge group reach, waterway regulation, security measures