关键词: 枢纽运行; 水位变幅; 适航河段; 非恒定流数值模拟; 乌东德水电站; 高山峡谷河段;

Abstract: Due to the topographical characteristics of high mountain and canyon river sections, such as narrow-curved reaches, many dangerous shoals, high-steep bank slope, the strong unsteady flow produced by peak regulation operation of hydropower stations in downstream rivers usually has a far greater impact on navigation than that in plain or ordinary mountain rivers.Taking the Wudongde Hydropower Station on the Jinsha River as an example, a one-dimensional unsteady flow mathematical model is applied to simulate the water level variation law of downstream reach of the power station, and the seaworthy area is divided, based on which the control measures for water level variation are initially proposed.The results show that the hydropower station operation in the high mountain and canyon river sections has a severe impact on the downstream water level, and variations amplitude of water level along the way shows overall attenuation but increases at the local bayonet.The 41 km section from the Wudongde Hydropower Station dam site to Sidouzhong is affected heavily by unsteady flow and the water level varies greatly, which is unsuitable for navigation.To reduce the amplitude of water level variation, measures such as reducing the amplitude of peak regulation, establishing the reverse regulation hub and dredging channel is suggested.

Key words: hub operation; water level variation; navigable reach; unsteady flow modelling; Wudongde Hydropower Station; river reach of high moutain and canyon;