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<p>The gravel thickness plays a&#xa0;decisive role in the stability of the riverbed and the bed load balance of the Danube east of Vienna. Anthropogenic interventions such as straightening, transverse structures and regulation measures for navigation have resulted in a&#xa0;significant sediment deficit in this area, which subsequently leads to riverbed erosion. Particularly problematic are areas with low gravel cover, where finer sediments of tertiary deposits are present and where the conditions for potential bed erosion are given. In this study, systematic monitoring of the gravel thickness was carried out in order to create a&#xa0;sound data basis for bedload management. With the help of GIS-supported interpolation methods, a&#xa0;high-resolution digital terrain model of the lower gravel layer was created from 1097 borehole core data and intersected with riverbed surveys of the last 18&#xa0;years. This made it possible to identify critical areas with low gravel cover and analyse their development over the last few years. The results show that some scour areas show a&#xa0;significant improvement in gravel cover, while others remain problematic. In addition, four new potential risk areas were identified. The investigations confirm that targeted sediment augmentation and bedload management measures have positive effects, but that precise monitoring is still required to reduce the risk potential.</p><p>The newly developed GIS-based monitoring tool provides a&#xa0;valuable basis for the long-term monitoring of river morphology and enables effective planning of future measures. The knowledge gained will help to develop sustainable strategies for stabilising the riverbed and thus ensure both the ecological function and the infrastructure function of the Danube.</p>

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Systematische Überwachung der Bereiche mit geringer Kiesüberdeckung an der Donau östlich von Wien

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年3月11日

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  • Marcel Liedermann,
  • Elisabeth Mayerhofer,
  • Robert Tögel,
  • Philipp Gmeiner,
  • Sebastian Pessenlehner,
  • Christoph Hauer,
  • Helmut Habersack

摘要

The gravel thickness plays a decisive role in the stability of the riverbed and the bed load balance of the Danube east of Vienna. Anthropogenic interventions such as straightening, transverse structures and regulation measures for navigation have resulted in a significant sediment deficit in this area, which subsequently leads to riverbed erosion. Particularly problematic are areas with low gravel cover, where finer sediments of tertiary deposits are present and where the conditions for potential bed erosion are given. In this study, systematic monitoring of the gravel thickness was carried out in order to create a sound data basis for bedload management. With the help of GIS-supported interpolation methods, a high-resolution digital terrain model of the lower gravel layer was created from 1097 borehole core data and intersected with riverbed surveys of the last 18 years. This made it possible to identify critical areas with low gravel cover and analyse their development over the last few years. The results show that some scour areas show a significant improvement in gravel cover, while others remain problematic. In addition, four new potential risk areas were identified. The investigations confirm that targeted sediment augmentation and bedload management measures have positive effects, but that precise monitoring is still required to reduce the risk potential.

The newly developed GIS-based monitoring tool provides a valuable basis for the long-term monitoring of river morphology and enables effective planning of future measures. The knowledge gained will help to develop sustainable strategies for stabilising the riverbed and thus ensure both the ecological function and the infrastructure function of the Danube.