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首页> 外文会议>International Congress on Conservation and Rehabilitation of Dams, Nov 11-13, 2002, Madrid, Spain >Methodologic criteria to modify existing dam stilling basins, to make them suitable for discharges bigger than original design flow
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Methodologic criteria to modify existing dam stilling basins, to make them suitable for discharges bigger than original design flow

机译：修改现有大坝静水盆地的方法学标准，以使其适合于比原始设计流量大的流量

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In order that ancient dams comply with the new security requirements demanded by the regulations in force, it is necessary to check them and to lay down general methodologic criteria. Based on this, the changes needed by these dams can be assessed and done so they function correctly with spillway flows bigger than original design flows. This paper is related to the stilling basins placed at the toe of gravity dam spillways where energy is dissipated by means of hydraulic jump. Some theoretical ideas are presented and they allow to plan the changes that have to be done to the stilling basin so it works correctly under the new flow conditions. These are: a predimensioning chart that makes easier the choice of the kind of stilling basin valid for a particular project according to the specific flow and the water level height upstream the spillway (crest elevation plus design head), and artificial aeration in the chute, inmediatly upstream of the dissipation structure, as a way to avoid cavitation and improve the hydraulic conditions at its entrance. Two examples are solved to clarify the ideas and reasonings presented.
机译：为了使古水坝符合现行法规所要求的新安全要求，有必要对其进行检查并制定通用的方法学标准。基于此，可以评估并完成这些大坝所需的更改，以便它们在溢洪道流量大于原始设计流量的情况下正常运行。本文涉及放置在重力坝溢洪道脚趾处的消静池，在那里通过水力跃迁消散能量。提出了一些理论思想，它们允许规划必须对消融池进行的更改，以使其在新的流量条件下能够正常工作。这些是：预先确定尺寸的图表，可根据溢洪道上游的特定流量和水位高度（波峰高程和设计压头）以及斜槽中的人工通气，更轻松地选择适用于特定项目的消音盆类型，位于消散结构上游的中间位置，以避免气蚀并改善其入口处的水力状况。解决了两个例子，以阐明提出的想法和推理。

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