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<p>The Pasterze Glacier is one of the largest glaciers in the Eastern Alps and since the middle of the 19<sup>th</sup>&#xa0;century it has been steadily receding. In the deglaciated areas (glacier forefield—proglacial), large amounts of glacial debris are exposed or deposited and the entire proglacial area is subject to major changes. The resulting landforms are highly dynamic both in terms of time and space. Since 2021, the consortium consisting of the Christian Doppler Laboratory for Sediment Research and Management and the Department of Climate Impact Research of GeoSphere Austria has been investigating the sediment availability in the glacier forefield of the Pasterze Glacier and trying to characterize the formation of different landforms and the individual processes.</p><p>Using drone-based high-resolution surface images and geophysical subsurface measurements (ground penetrating radar), both the surface itself and the subsurface were investigated. The results show large thicknesses of the sediment deposits, which indicate very compact or frozen sediments as well as dead ice. The proglacial channel also shows a&#xa0;tendency towards stabilization of the bed. Quantitative statements on the presence of dead ice cannot yet be made, as the differentiation between dead ice and compressed, ice-containing sediments has not yet been completed. The different ablation dynamics of the Pasterze Glacier and the very large sediment volume led to a&#xa0;(temporary) lateral narrowing of the main proglacial channel with a&#xa0;flattening longitudinal profile up to the shallow mouth area into the Pasterzensee. The proglacial channel also shows a&#xa0;tendency to stabilize the bed.</p>

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Sedimenttransport und Klimawandel: Abschätzung der Sedimentverfügbarkeit und Prozesscharakterisierung in hochalpinen Einzugsgebieten mittels interdisziplinärer Ansätze

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月17日

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  • Michael Avian,
  • Michael Paster,
  • Melina Frießenbichler,
  • Alois Hinterleitner,
  • Christoph Hauer

摘要

The Pasterze Glacier is one of the largest glaciers in the Eastern Alps and since the middle of the 19th century it has been steadily receding. In the deglaciated areas (glacier forefield—proglacial), large amounts of glacial debris are exposed or deposited and the entire proglacial area is subject to major changes. The resulting landforms are highly dynamic both in terms of time and space. Since 2021, the consortium consisting of the Christian Doppler Laboratory for Sediment Research and Management and the Department of Climate Impact Research of GeoSphere Austria has been investigating the sediment availability in the glacier forefield of the Pasterze Glacier and trying to characterize the formation of different landforms and the individual processes.

Using drone-based high-resolution surface images and geophysical subsurface measurements (ground penetrating radar), both the surface itself and the subsurface were investigated. The results show large thicknesses of the sediment deposits, which indicate very compact or frozen sediments as well as dead ice. The proglacial channel also shows a tendency towards stabilization of the bed. Quantitative statements on the presence of dead ice cannot yet be made, as the differentiation between dead ice and compressed, ice-containing sediments has not yet been completed. The different ablation dynamics of the Pasterze Glacier and the very large sediment volume led to a (temporary) lateral narrowing of the main proglacial channel with a flattening longitudinal profile up to the shallow mouth area into the Pasterzensee. The proglacial channel also shows a tendency to stabilize the bed.