Computer Science – Sound
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983amsci..71..158m&link_type=abstract
American Scientist, vol. 71, Mar.-Apr. 1983, p. 158-165.
Computer Science
Sound
17
Fluid Flow, Landslides, Mass Flow, Rock Mechanics, Sound Waves, Debris, Mars Surface, Meteorite Craters, Pressure Reduction, Slopes
Scientific paper
Evidence for the fluid-like flow of rock debris is discussed, together with a conceptual model for the underlying processes. The phenomenon occurs with both crater walls and long-runout landslides. It is suggested that individual rocks in a debris mass may possess a degree of random motion and act like a dense gas, thereby being capable of flowing like a fluid. A sound wave propagating through a pile of rocks in contact and supporting an overburden of debris can be separated by half the sound wavelength and relieve the immobilizing overburden pressure. Exceeding the pressure permits the rocks to flow. The debris can be located on a gentle slope because of the efficiency of the conversion of gravitational potential energy to acoustic energy. The distance the mass will slide forward is proportional to its thickness. Applications of the principle for moving grain, sugar, and coal in storage bins are suggested.
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