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首页> 外文会议>HydroVision 2008 conference technical papers >A DAM SAFETY SOLUTION BY PIANO KEY WEIR FOR ENHANCED SPILLWAY CAPACITY
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A DAM SAFETY SOLUTION BY PIANO KEY WEIR FOR ENHANCED SPILLWAY CAPACITY

机译：PIANO KEY WEIR的DAM安全解决方案，可增强溢洪道能力

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摘要

Free-flow spillways are simpler and safer than gated ones, but the low specific flowrnof their traditional shapes requires high spilling nappe depths and thus huge losses ofrnstorage (100 ×109m3 worldwide). A newly evolved shape of free-flow spillway (thern"Piano Key weir") has the potential to increase the specific flow as high as fourfold atrnlower discharges. It could substantially increase, at low cost, the safety and the storagernand/or the flood control efficiency of many existing as well as new dams. It is thus veryrnadvantageous to increase the specific flow as much as possible. Some tens of existingrnspillways have been designed accordingly as vertical walls on a flat bottom, with arntrapezoidal labyrinth layout which is much longer than the spillway length (often fourrntimes). They usually double the specific flow of an Ogee Spillway. Piano-Key Weirrnderives its name from its plan-form shape which looks like a 'piano-key'. It is configuredrnas polygonal walls such as to provide a much longer crest length than the conventionalrnogee spillways. This paper presents experimental data analysis on this new solution inrnorder that increasing the storage and spilling capacity of many irrigation dams is justifiedrnby the increased needs or due to the sedimentation of reservoirs and Improving floodrnmitigation. Positive outcome of this study will be very much relevant for dam safetyrnconcerns worldwide in the context of adverse hydrological consequences due tornongoing global warming phenomenon and climate change.
机译：自由流动溢洪道比闸门溢洪道更简单，更安全，但是其传统形状的低比溢流口要求较高的溢流口深度，因而造成巨大的储存损失（全球100×109m3）。一种新发展的自由流溢洪道形状（“钢琴键堰”）有可能将比流量增加到最低流量的四倍。它可以以低成本显着提高许多现有和新坝的安全性和储藏量和/或防洪效率。因此，尽可能多地增加比流量是非常有利的。据此，已有数十条现有溢洪道被设计为平底的垂直墙，其梯形迷宫布置比溢洪道的长度长得多（通常是四倍）。它们通常使Ogee溢洪道的流量增加一倍。 Piano-Key Weirrn从其外形像“钢琴键”的平面形状中得了名。它被构造成多边形壁，以提供比传统的溢洪道更长的波峰长度。本文对这一新的解决方案进行了实验数据分析，认为增加灌溉水库的蓄水量和溢洪能力是由于需求增加或由于水库的淤积和改善洪水的缓解。由于全球变暖现象和气候变化的持续下去，在不利的水文后果的背景下，这项研究的积极成果将与全球大坝安全问题息息相关。

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