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首页> 外文会议>Association of State Dam Safety Officials, Inc. 2002 Annual Conference Sep 8-11, 2002 Tampa, Florida >TAILWATER RESTORATION AT LIVINGSTON DAM
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TAILWATER RESTORATION AT LIVINGSTON DAM

机译：利文斯顿大坝的尾水修复

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摘要

Significant degradation of the tailrace channel bottom and shifting of the meandering Trinity River downstream of the Livingston Lake Dam and Spillway, have caused the tailwater levels to be lowered over the last thirty years since the dam was built. This degradation, although progressive, is observed in stages as a severe sustained flood period such as that in the spring of 2001, has resulted in significant bank and bed erosion. As a result of the lower tailwater levels, the hydraulic jump which, should normally be contained in the stilling basin was at least partially formed downstream of the concrete apron. The relatively high water velocity and turbulence were dissipated on the riprap protection of the downstream channel, causing scour, and potential undermining of the stilling basin end sill and slabs. The degradation appears to have the worst consequences for small to medium floods, while under the design conditions of the larger flood, i.e., spillway design flood, the entire downstream channel would be drowned, and therefore less hydraulic energy would required to be dissipated.
机译：自大坝建成以来的最后三十年中，尾水渠底部的严重退化以及曲折的三位一体河在利文斯顿湖大坝和溢洪道的下游转移，导致尾水水位降低。这种退化虽然是渐进性的，但在一个严重的持续洪水时期（例如2001年春季）中被分阶段观察到，导致了严重的河床和河床侵蚀。由于较低的尾水位，通常应包含在消静池中的水力跃迁至少部分地形成在混凝土围裙的下游。相对较高的水流速度和湍流消散在下游河道的防抛物保护上，从而引起冲刷，并可能消弱静水盆地的底梁和平板。对于中小型洪水，退化似乎具有最严重的后果，而在较大洪水的设计条件下，即溢洪道设计洪水，整个下游河道将被淹没，因此需要消耗的水力能量更少。

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