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Air entrainment and energy dissipation on Gabion stepped weirs

机译:石笼形阶梯堰上的空气夹带和能量消散

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摘要

In the last three decades the design of stepped spillways regained some interest because of their suitability with new construction methods including gabion placement. In this study, the hydraulic performances of gabion stepped weirs were investigated experimentally in terms of the air-water flow properties and energy dissipation rate. A physical study was performed in a relatively large size facility with a 26.6° slope (1V:2H) and 0.10 m step height. For both gabion and impervious stepped weirs, a detailed comparison of the air-water flow properties was performed. The visual observations highlighted the seepage flow through the gabions, including a modification of the cavity flow dynamics, especially in the skimming flow regime. In skimming flows, higher velocities were measured at the downstream end of the gabion stepped chute, associated with lesser energy dissipation rates.
机译:在过去的三十年中,阶梯式溢洪道的设计重新引起了人们的兴趣,因为它们适用于包括石笼放置在内的新施工方法。在这项研究中,对石笼网阶梯堰的水力性能进行了实验研究,包括空气-水流特性和能量耗散率。物理研究是在相对大型的设施中进行的,坡度为26.6°(1V:2H),台阶高度为0.10 m。对于石笼网和不透水的阶梯堰,对空气-水流特性进行了详细的比较。视觉观察突出了穿过石笼的渗流,包括对腔体流动力学的修改,尤其是在撇渣流区域。在撇渣流中,在石笼阶梯式溜槽的下游端测得较高的速度,这与较小的能量耗散率有关。

著录项

  • 作者

    Wuthrich D.; Chanson H.;

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  • 年度 2014
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  • 原文格式 PDF
  • 正文语种 eng
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