Sonic sands
Identifieur interne : 000221 ( Main/Exploration ); précédent : 000220; suivant : 000222Sonic sands
Auteurs : Bruno Andreotti [France]Source :
- Reports on Progress in Physics [ 0034-4885 ] ; 2012.
English descriptors
- Teeft :
- Acceleration signal, Acoustic, Acoustic dissipation, Acoustic emission, Acoustic emission mechanism, Acoustic emissions, Acoustic modes, Acoustic propagation, Acoustic rays, Acoustic wave, Acoustic wavelength, Acoustic waves, Amplitude, Andreotti, Atlantic sahara, Avalanche, Bonneau, Booming, Booming avalanches, Booming dune, Booming dunes, Booming frequency, Booming results, Booming sand, Booming sand dunes, Capillary bridges, Coherence, Coherent signal, Coherent vibration, Constant speed, Convective, Convective instability, Data points, Different modes, Dimensional analysis, Dispersion relation, Displacement component, Dissipation, Douady, Dune, Dynamical, Dynamical mechanisms, Effective medium, Elastic, Elastic waves, Emission frequency, Emission threshold, Error bars, Fluid mech, Free surface, Frequency, Frequency peak, Frequency selection, Frictional, Frictional interface, Geogr, Grain diameter, Grain size, Grain size distribution, Granular, Granular matter, Granular media, Granular media phys, Granular medium, Granular shear, Grey line, Growth rate, Gure, Harmonics, Impacting, Impacting pestle experiment, Index gradient, Instability, Instability threshold, Interface, Jamming transition, Laboratory experiments, Lett, Linear stability analysis, Localization, Localized, Loud speaker, Mach number, Mech, Microscopic friction, Musical sand, Nonlinear, Nonlinear elasticity, Normal stress, Other hand, Other words, Passive resonance, Pestle, Pestle experiment, Phys, Plane waves, Plow experiment, Plow velocity, Previous experiments, Prog, Propagating, Propagation speed, Resonant, Resonant frequency, Resonant mode, Sahara, Sand, Sand dunes, Sand grains, Sand layer, Sand organ experiment, Sand surface, Several minutes, Shear band, Shear bands, Shear localization, Shear rate, Shear stress, Silo, Single grain, Solid line, Sonic, Sonic sand, Sonic sands, Sound amplitude, Sound emission, Sound propagation, Squeaking, Static dune, Such measurements, Surface layer, Synchronization, Synchronization instability, Thin lines, Threshold height, Tube radius, Vibration, Vibration amplitude, Vibration modes, Volume fraction, Vriend, Wave guide, Wave number, Wave packet.
Abstract
Many desert sand dunes emit a loud sound with a characteristic tremolo around a well-defined frequency whenever sand is avalanching on their slip face. This phenomenon, called the song of dunes, has been successfully reproduced in the lab, on a smaller scale. In all cases, the spontaneous acoustic emission in air is due to a vibration of the sand, itself excited by a granular shear flow. This review presents a complete characterization of the phenomenonfrequency, amplitude, source shape, vibration modes, instability thresholdbased on recent studies. The most prominent characteristics of acoustic propagation in weakly compressed granular media are then presented. Finally, this review describes the different mechanisms proposed to explain booming avalanches. Measurements performed to test these theories against data allow one to contrast explanations that must be rejectedsound resonating in a surface layer of the dune, for instancewith those that still need to be confirmed to reach a scientific consensusamplification of guided elastic waves by friction, in particular.
Url:
DOI: 10.1088/0034-4885/75/2/026602
Affiliations:
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This phenomenon, called the song of dunes, has been successfully reproduced in the lab, on a smaller scale. In all cases, the spontaneous acoustic emission in air is due to a vibration of the sand, itself excited by a granular shear flow. This review presents a complete characterization of the phenomenonfrequency, amplitude, source shape, vibration modes, instability thresholdbased on recent studies. The most prominent characteristics of acoustic propagation in weakly compressed granular media are then presented. Finally, this review describes the different mechanisms proposed to explain booming avalanches. Measurements performed to test these theories against data allow one to contrast explanations that must be rejectedsound resonating in a surface layer of the dune, for instancewith those that still need to be confirmed to reach a scientific consensusamplification of guided elastic waves by friction, in particular.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Île-de-France</li></region><settlement><li>Paris</li></settlement></list><tree><country name="France"><region name="Île-de-France"><name sortKey="Andreotti, Bruno" sort="Andreotti, Bruno" uniqKey="Andreotti B" first="Bruno" last="Andreotti">Bruno Andreotti</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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