Abstract
Close to the onset of Aeolian particle transport through saltation we
find in wind tunnel experiments a regime of discontinuous flux
characterized by bursts of activity. Scaling laws are observed in the
time delay between each burst and in the measurements of the wind
fluctuations at the fluid threshold Shields number theta(c). The time
delay between each burst decreases on average with the increase of the
Shields number until sand flux becomes continuous. A numerical model for
saltation including the wind-entrainment from the turbulent fluctuations
can reproduce these observations and gives insight about their origin.
We present here also for the first time measurements showing that with
feeding it becomes possible to sustain discontinuous flux even below the
fluid threshold.
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