三峡工程导流底孔布置及方案比较水力学研究

Hydraulics Study on Arrangement and Scheme Comparison of Diversion Bottom Outlets for TGP

三峡工程导流底孔承担三期导、截流和围堰发电期泄洪任务，水头高、流量大、运行条件复杂，为国内外导流工程罕见。并且关系到工程施工安全和工期。本文概述了底孔布置、体型和运行条件等方面的水力学研究，以及底孔长、短有压段两个方案进行的比较研究和优化成果。

With their major functions of river diversion and closure in the 3rd construction phase and releasing flood in the initial cofferdam supported generation period, the diversion bottom outlets of the TGP are hardly seen in the world for their high water head, huge discharges and complex operation conditions. A lot of hydraulics model tests have been conducted in the past decade. This paper presents briefly the study results on their arrangements, configurations and operation conditions. Two major schemes, i.e. long pressure conduit and short pressure conduit, are compared and optimized in viewpoint of hydraulics.