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Sonic sands.

Bruno Andreotti1

  • 1Physique et Mécanique des Milieux Hétérogènes, UMR 7636 ESPCI -CNRS, Univ. Paris-Diderot, 10 rue Vauquelin, 75005 Paris, France.

Reports on Progress in Physics. Physical Society (Great Britain)
|July 14, 2012
PubMed
Summary
This summary is machine-generated.

Desert sand dunes produce a unique sound, the "song of dunes," caused by avalanching sand. This review characterizes the phenomenon and explores theories behind booming avalanches.

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Area of Science:

  • Geophysics
  • Acoustics
  • Granular Mechanics

Background:

  • Large desert sand dunes emit a distinct, loud sound with a characteristic tremolo frequency during sand avalanches on their slip face, a phenomenon known as the 'song of dunes'.
  • This acoustic emission has been successfully replicated in laboratory settings on a smaller scale, confirming its origin in sand vibration excited by granular shear flow.

Purpose of the Study:

  • To provide a comprehensive characterization of the 'song of dunes' phenomenon, including its frequency, amplitude, source shape, vibration modes, and instability threshold.
  • To present the key characteristics of acoustic propagation within weakly compressed granular media.
  • To review and evaluate proposed mechanisms that explain the occurrence of booming avalanches.

Main Methods:

  • Characterization of dune acoustics through recent studies, detailing parameters like frequency, amplitude, and vibration modes.
  • Analysis of acoustic propagation in granular media.
  • Evaluation of theoretical models for booming avalanches against experimental data.

Main Results:

  • The 'song of dunes' is consistently linked to sand vibration driven by granular shear flow.
  • Key acoustic properties such as frequency, amplitude, and instability thresholds have been defined.
  • Acoustic propagation in granular media exhibits specific characteristics relevant to the phenomenon.

Conclusions:

  • Certain explanations, like sound resonance in a dune's surface layer, are contradicted by data.
  • The theory of amplified guided elastic waves through friction remains a plausible but unconfirmed mechanism requiring further investigation to reach scientific consensus.