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Area of Science:

  • Glaciology
  • Environmental Science
  • Hydrology

Background:

  • Cryospheric changes significantly alter sediment export from glacierized catchments.
  • This impacts downstream ecosystems and infrastructure, such as hydropower.
  • Understanding subglacial bedload transport is limited due to observational difficulties.

Purpose of the Study:

  • To elucidate factors controlling sediment export from Alpine glaciers.
  • To compare suspended sediment and bedload transport processes.
  • To investigate the role of subglacial hydraulics in sediment evacuation.

Main Methods:

  • Utilized a physically-based numerical model for subglacial sediment production and transport.
  • Inverted the model using suspended sediment and continuous bedload discharge records.
  • Analyzed Alpine glacier data.

Main Results:

  • Comparable quantities of suspended sediment and bedload are exported.
  • Both sediment types depend on sediment availability for transport.
  • Bedload export is influenced by subglacial channel hydraulics (shape, roughness), making it less efficient than fine sediment transport.

Conclusions:

  • Subglacial hydraulics must be explicitly considered in bedload export studies.
  • Suspended and bedload transport should be analyzed separately.
  • Inefficient meltwater-driven bedload evacuation suggests non-fluvial mechanisms are crucial for continued glacial erosion.