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<p>The bed topography has a significant influence on the flow behaviour of a watercourse. Mountain streams have a heterogeneous, highly structured bed with broad grain size distributions, which significantly influence the flow conditions and thus the bedload transport. Due to their structured bed topography (riffle pools, step pools, rough beds, etc.), shallow water depths, turbulent flows and their limited accessibility, mountain streams are a challenge for all surveying methods. Traditional surveying methods such as tachymetry or hydroacoustic techniques, if applicable at all, can only approximate the details of the riverbed structures. The fast progress in remote sensing methods, such as topo-bathymetric lidar, allows a spatially continuous and detailed survey of highly structured alpine wetted riverbed topography. The resulting data, a high-resolution 3D point cloud, is able to capture the riverbed structure with a positional accuracy in the decimetre range. However, the data quality depends on adequate conditions during the acquisition. The survey data enables users to investigate hydraulic and morphological phenomena in mountain streams in high spatial resolution.</p>

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Vermessung von Gebirgsbächen - Traditionelle Methoden und innovative Techniken

  • 期刊论文

  • 发表日期：

    2025年6月3日

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  • Theresa Himmelsbach,
  • Katharina Baumgartner,
  • Bernhard Gems,
  • Markus Aufleger,
  • Gottfried Mandlburger

摘要

The bed topography has a significant influence on the flow behaviour of a watercourse. Mountain streams have a heterogeneous, highly structured bed with broad grain size distributions, which significantly influence the flow conditions and thus the bedload transport. Due to their structured bed topography (riffle pools, step pools, rough beds, etc.), shallow water depths, turbulent flows and their limited accessibility, mountain streams are a challenge for all surveying methods. Traditional surveying methods such as tachymetry or hydroacoustic techniques, if applicable at all, can only approximate the details of the riverbed structures. The fast progress in remote sensing methods, such as topo-bathymetric lidar, allows a spatially continuous and detailed survey of highly structured alpine wetted riverbed topography. The resulting data, a high-resolution 3D point cloud, is able to capture the riverbed structure with a positional accuracy in the decimetre range. However, the data quality depends on adequate conditions during the acquisition. The survey data enables users to investigate hydraulic and morphological phenomena in mountain streams in high spatial resolution.