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Visualizing Hyporheic Flow Through Bedforms Using Dye Experiments and Simulation
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A bedform phase diagram for dense granular currents.

Gregory Smith1, Peter Rowley2,3,4, Rebecca Williams2

  • 1Department of Geography, Geology and Environment, University of Hull, Hull, UK. Gregory.Smith-2016@hull.ac.uk.

Nature Communications
|June 10, 2020
PubMed
Summary
This summary is machine-generated.

Pyroclastic density currents (PDCs) can form diverse bedforms, not just from dilute flows. New experiments show denser, aerated granular currents also create these features, requiring reevaluation of volcanic deposit interpretations.

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Area of Science:

  • Volcanology
  • Sedimentology
  • Geological Hazards

Background:

  • Pyroclastic density currents (PDCs) are dangerous volcanic flows.
  • Interpreting PDC deposits is crucial for hazard assessment.
  • Existing interpretations link bedforms to dilute, turbulent flows.

Purpose of the Study:

  • To investigate bedform formation in different PDC flow regimes.
  • To challenge the assumption that bedforms exclusively indicate dilute flows.
  • To redefine the conditions for PDC deposit bedform genesis.

Main Methods:

  • Analogue experiments simulating granular currents.
  • Observation and analysis of bedform development.
  • Phase field definition for bedform formation.
  • Field examination of ignimbrite deposits.

Main Results:

  • Denser, aerated granular currents produce various bedforms.
  • Backset bedforms form from upstream-propagating granular bores in waning flows.
  • Defined phase fields for bedform genesis in PDC deposits.
  • Ignimbrite examples show field interpretations may be flawed.

Conclusions:

  • Bedform interpretation in PDC deposits needs revision.
  • Denser flow conditions are significant for bedform creation.
  • Findings impact hazard assessment and understanding of volcanic processes.