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<p>The CD Laboratory for Sediment Research and Management pursued the overarching goal of improving the economic, technical and ecological standards for hydropower use in particular and those for river management in general. This article provides an overview of the most important experimental findings of the CD Laboratory. These include fundamental research on coherent structures, the onset of movement of single stones resting on the river bed and potential scaling effects in scaled model experiments. Coherent vortex structures were measured and visualized for the first time using a&#xa0;non-contact, time-resolved 3D measurement technique and caused the movement of a&#xa0;single grain on a&#xa0;rough bed. Vortex shedding also plays a&#xa0;major role in flows around bridge piers, groynes, vegetation etc. Scaling effects were observed in the scaled model for these processes, which underlines the need for large-scale experiments. The application-oriented studies focused primarily on investigations into reservoir sedimentation and the remobilization of sedimented areas in run-of-river power plants. A&#xa0;low weir sill height in relation to the initial bed level and the lowest possible widening at the power plant itself can significantly improve sediment connectivity. Frequently occurring, smaller flood events can be used effectively to flush run-of-river power plants for a&#xa0;full reservoir drawdown. If drawdown flushing is not possible due to structural conditions, local sediment augmentation can be considered by means of hopper barges or artificially installed sediment deposits. A&#xa0;1D&#xa0;advection and dispersion model was successfully applied to describe a&#xa0;local bedload input in a&#xa0;laboratory experiment. This model and its further 2D-developments can be used in the future as a&#xa0;tool to predict the spatial and temporal development of planned bedload inputs in rivers.</p>

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Grundlagen- und anwendungsorientierte experimentelle Forschung zu Stauraumverlandung und Remobilisierung bei Laufkraftwerken sowie Advektions- und Dispersionsprozessen von Geschiebeinput

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年3月7日

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  • Christine Sindelar,
  • Kevin Reiterer,
  • Thomas Gold,
  • Johannes Schobesberger,
  • Petr Lichtneger,
  • Dominik Worf,
  • Christoph Hauer,
  • Helmut Habersack

摘要

The CD Laboratory for Sediment Research and Management pursued the overarching goal of improving the economic, technical and ecological standards for hydropower use in particular and those for river management in general. This article provides an overview of the most important experimental findings of the CD Laboratory. These include fundamental research on coherent structures, the onset of movement of single stones resting on the river bed and potential scaling effects in scaled model experiments. Coherent vortex structures were measured and visualized for the first time using a non-contact, time-resolved 3D measurement technique and caused the movement of a single grain on a rough bed. Vortex shedding also plays a major role in flows around bridge piers, groynes, vegetation etc. Scaling effects were observed in the scaled model for these processes, which underlines the need for large-scale experiments. The application-oriented studies focused primarily on investigations into reservoir sedimentation and the remobilization of sedimented areas in run-of-river power plants. A low weir sill height in relation to the initial bed level and the lowest possible widening at the power plant itself can significantly improve sediment connectivity. Frequently occurring, smaller flood events can be used effectively to flush run-of-river power plants for a full reservoir drawdown. If drawdown flushing is not possible due to structural conditions, local sediment augmentation can be considered by means of hopper barges or artificially installed sediment deposits. A 1D advection and dispersion model was successfully applied to describe a local bedload input in a laboratory experiment. This model and its further 2D-developments can be used in the future as a tool to predict the spatial and temporal development of planned bedload inputs in rivers.