三峡变动回水区广阳坝河段河床演变及整治方案

广阳坝河段是三峡变动回水区朝天门—涪陵河段通航卡口河段之一，消落期需实施通行控制方能保障航行安全，严重制约了该段航道通过能力。针对广阳坝河段在消落期航道条件差的问题，采用实测地形对比的方法，对其河床演变进行分析，并对碍航特性进行论述。在此基础上，提出改善航道条件、提高航道尺度的整治方案，并分析其整治效果，可为提升朝天门—涪陵河段航道尺度提供支撑。

Riverbed evolution and waterway regulation scheme of Guangyangba reach in fluctuating backwater area of the Three Gorges Reservoir

Guangyangba reach is one of the navigable bayonet reaches from Chaotianmen to Fuling reach in the fluctuating backwater area of the Three Gorges. Traffic control is required to ensure navigation safety during the ebb and flow period, which seriously restricts the passage capacity of this section. Aiming at the problem of poor channel condition in fluctuation period of Guangyangba reach, the riverbed evolution is analyzed by using the method of real measured topography comparison, and the navigation-obstructing characteristics are discussed. On this basis, the regulation scheme to improve the channel condition and the channel dimensions is put forward, and the regulation effect is analyzed, which can provide support for improving the channel dimensions of Chaotianmen to Fuling river channel.