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导流明渠是三峡工程二期施工中长江唯一的泄水通道,同时兼负着导流和通航两大任务。从流态、流速、脉动压力观测及船舶航行等方面全面介绍了导流明渠建成后4a的水力学观测成果,并结合模型资料进行了对比分析。分析结果表明:明渠运行顺畅,说明设计是成功的;设计采用高低断面,使主流引向渠道中部,是有成效的。但是弯道水流特性不仅存在,而且相当明显。这一方面说明弯道水流的特性是难以改变的,另一方面说明在弯道上布置这样的明渠是可行的。4a来明渠经历了几次大洪水的考验,并提高了通航流量。
The diversion channel is the only drainage channel in the Yangtze River during the second phase of the Three Gorges Project construction. At the same time, it has two major tasks of diversion and navigation. The hydrodynamic observation results of 4a after the construction of diversion channel are completed are introduced comprehensively from the aspects of flow pattern, velocity, pulsating pressure observation and ship sailing. The comparative analysis is made based on the model data. The analysis shows that the smooth operation of the open channel shows that the design is successful. It is effective to design the high and low sections so that the mainstream can be led to the middle of the channel. But the curve flow characteristics not only exist, but also quite obvious. On the one hand, it is difficult to change the characteristics of curved water flow, on the other hand, it is feasible to arrange such open channels on the curved road. 4a. The open channel has experienced several major flood tests and has increased its traffic flow.