Velocity fluctuations in a granular surface flow are studied. These fluctuations are self-similar at small scales with an energy density spectrum showing a −5∕3 power law. The probability density functions of velocity increments are strongly non-Gaussian. The moments of velocity differences between two points separated by a distance r vary as a power law with the scale r; the exponents saturate at a value of 2∕3 showing very strong intermittency of the velocity fluctuations.
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Kellay et al. (2007) studied this question.
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