三峡工程导流明渠水力学原型观测成果分析

Analysis on hydrulics prototype observation data of diversion channel of TGP

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 open channel is the only flow passage for diversion and navigation in the second construction stageof TGP. The hydraulic prototype obsevation data obtained in the four years after the operation of diversion chan-nel are presented, including the flow pattern, velocity, fluctuation pressure, the ship sailing-tracking-line, etc.Cbmpared with the medel test results, it is concluded that the diversion channel is operated in a normal condi-tion, and its design is successful; the compound cross-section is available for the main flow to be derived to thecentral part of the channel, but the characteristics of bending flow are very distinct and can hardly be changed.After enperiencing a few years flood, the open channel is proved to be safe and the navigation discharge has beenraised than the original design.