Mid‐Air Collisions Control the Wavelength of Aeolian Sand Ripples
Xinghui Huo,
Hans J. Herrmann,
Jie Zhang
et al.
Abstract:The wavelength of aeolian sand ripples increases with wind velocity, but the cause for this increase remained unclear until now. Using numerical simulations, we find that the relationship between the wind strength and the initial wavelength disappears without mid‐air collisions, which means that mid‐air collisions crucially contribute to the initial wavelength of ripples. As wind strength increases, the average hop length of non‐colliding particles decreases. Affected by the bed surface topography and the non‐… Show more
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