Solving the mystery of booming sand dunes

Desert booming can be heard after a natural slumping event or during a sand avalanche generated by humans sliding down the slip face of a large dune. The sound is remarkable because it is composed of one dominant audible frequency (70 to 105 Hz) plus several higher harmonics. This study challenges earlier reports that the dunes' frequency is a function of average grain size by demonstrating through extensive field measurements that the booming frequency results from a natural waveguide associated with the dune. The booming frequency is fixed by the depth of the surficial layer of dry loose sand that is sandwiched between two regions of higher compressional body wave velocity. This letter presents measurements of the booming frequencies, compressional wave velocities, depth of surficial layer, along with an analytical prediction of the frequency based on constructive interference of propagating waves generated by avalanching along the dune surface.

[1]  Arthur Beiser,et al.  Elastic Waves in Layered Media , 2015 .

[2]  É. Clément,et al.  Surface elastic waves in granular media under gravity and their relation to booming avalanches. , 2008, Physical review. E, Statistical, nonlinear, and soft matter physics.

[3]  W. Lauriks,et al.  Acoustic probing of the jamming transition in an unconsolidated granular medium. , 2007, Physical review letters.

[4]  É. Clément,et al.  Comment on “Solving the mystery of booming sand dunes” by Nathalie M. Vriend et al. , 2007, 0710.1815.

[5]  S. Douady,et al.  Song of the dunes as a self-synchronized instrument. , 2004, Physical review letters.

[6]  B. Andreotti,et al.  The song of dunes as a wave-particle mode locking. , 2004, Physical review letters.

[7]  X. Jia,et al.  Ultrasound Propagation in Externally Stressed Granular Media , 1999 .

[8]  Franco Nori,et al.  Sound-producing sand avalanches , 1997 .

[9]  S. Carlson.  Getting a Charge out of Rain , 1997 .

[10]  P. Haff.  Booming sands of the Mojave Desert and the Basin and Range Province, California , 1979 .

[11]  T. L. Criswell,et al.  Sound-producing dune and beach sands , 1976 .

[12]  David R. Criswell,et al.  Seismic and acoustic emissions of a booming dune. [in lunar, planetary and terrestrial sand motion] , 1975 .

[13]  Richard M. White,et al.  Surface elastic waves , 1970 .

[14]  D. W. Humphries.  THE BOOMING SAND OF KORIZO, SAHARA, AND THE SQUEAKING SAND OF GOWER, S. WALES: A COMPARISON OF THE FUNDAMENTAL CHARACTERISTICS OF TWO MUSICAL SANDS , 1966 .

[15]  H. Heywood.  The Physics of Blown Sand and Desert Dunes , 1941, Nature.

[16]  A. D. Lewis.  Roaring Sands of the Kalahari Desert , 1936 .

[17]  P. King,et al.  Tales of travel , 1988 .

[18]  N. Barlow.  The Voyage of the Beagle , 1932, Nature.