梯级水利枢纽生态调度对库区航道影响案例分析

针对汉江梯级枢纽首次生态调度实施以后,汉江兴隆枢纽常年库区新河口河段航道弯曲出浅的问题,对水文条件、河床演变和航道尺度进行分析,探究汉江梯级枢纽生态调度对兴隆枢纽库区航道的影响,预测库区航道发展趋势。结果表明,汉江梯级枢纽首次生态调度期间,兴隆枢纽库区水位陡落陡涨,水流比降流速大,兴隆枢纽库区马良—沙洋河段过渡段航道稳定性差,调度历时短导致过渡段航槽缺乏足够的水流冲刷而出现碍航情况。预测远期马良—沙洋段过渡段均可能存在航道摆动的现象,且河槽将呈淤积趋势,航道条件可能进一步恶化。

Case study on impact of ecological dispatch of cascade hubs on waterway in reservoir area

Aiming at the shallow bending of the Xinhekou channel in the Xinglong reservoir area of the Hanjiang River after implementation of the first ecological dispatch of cascade hubs,we analyze the hydrological conditions,river bed evolution and channel scale,probe into the influence of the ecological dispatch of the cascade hubs on the navigation channel,and predict the development trend of the navigation channel in the reservoir area.The results show that the water level of the Xinglong Reservoir rises sharply during the ecological dispatching,and the flow rate is larger than that of the downward flow.The stability of the channel in the transitional section from Maliang to Shayang reach of the Xinglong Reservoir is poor,the duration of ecological dispatching is short,and the channel in the transitional section after the impoundment of the Xinglong Reservoir is prone to navigation obstruction due to the lack of sufficient flow scouring duration.It is predicted that there may be channel oscillation in the transitional section from Maliang to Shayang in the long term,the channel will be silted up,and the channel conditions may deteriorate further.