三峡水库变动回水区胡家滩滩段阶梯状整治建筑物设计方案

Stepped navigation regulation structures design of Hujiatan beach in fluctuating backwater area of the Three Gorges reservoir

三峡工程175 m蓄水运行后,重庆主城区胡家滩河段成为变动回水区上段。受枢纽调蓄影响,该河段走沙期从枯水期调整为汛后蓄水前和三峡水库消落期,冲刷历时缩短,冲刷能力减弱。在本河段航道整治工程方案研究过程中,为充分利用消落期不同流量冲刷能力,论证整治建筑物头部2.5 m和3 m两级高程,最终以2.5 m和3 m的两级阶梯式坝体为推荐方案。物理模型系列年试验成果表明,方案实施后可保持胡家滩新挖航槽的稳定和合理的上滩指标。

Hujiatan beach becomes the upper reach of the fluctuating backwater area after the Three Gorges reservoir＇s running with 175 m water level, and the period of river bed evolution changes a lot and becomes shorter. During study of the regulation engineering scheme, the 2.5 m and 3 m spur dike head levels are demonstrated in order to take full advantage of the scouring ability of different flow. A new stepped dam of 2.5 m and 3 m head level is the recommended. The physical model test results show that the new dredged channel can be maintained and keep reasonable indicators on the beach after the program is implemented.