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Dynamics of grain avalanches.

Jean Rajchenbach1

  • 1Laboratoire des Milieux Désordonnés et Hétérogènes (CNRS-UMR 7603)-Case 86, Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris Cedex 05, France.

Physical Review Letters
|January 22, 2002
PubMed
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Avalanche mass grows linearly over time in granular flow experiments. The study reveals distinct velocities for the upper and lower avalanche fronts, explaining the dynamics of granular avalanches.

Area of Science:

  • Physics
  • Geophysics
  • Materials Science

Background:

  • Avalanches in granular materials are complex phenomena.
  • Understanding avalanche dynamics is crucial for predicting natural disasters and optimizing industrial processes.

Purpose of the Study:

  • To investigate the nucleation and growth of avalanches in a controlled experimental setup.
  • To quantitatively analyze the relationship between avalanche mass, growth rate, and front velocities.

Main Methods:

  • Utilizing a bidimensional packing of noncohesive grains in a rotating drum as a model experimental system.
  • Measuring and analyzing the velocities of the upper and lower avalanche fronts.
  • Developing simple mechanisms to explain observed dynamical properties.

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Main Results:

  • Avalanche mass exhibits linear growth over time.
  • The growth rate is determined by the velocities of the up and down fronts.
  • The upper front propagates at the average velocity of flowing grains.
  • The downslope front moves at approximately twice the avalanche velocity.

Conclusions:

  • The study provides a quantitative understanding of avalanche growth dynamics in granular systems.
  • The distinct front velocities offer insights into the mechanisms governing avalanche propagation.
  • The findings contribute to the modeling and prediction of granular avalanches.