Sand Ripples Induced by Water Shear Flow in an Annular Channel

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Betat, André ; Frette, Vidar ; Rehberg, Ingo:
Sand Ripples Induced by Water Shear Flow in an Annular Channel.
In: Physical Review Letters. Bd. 83 (1999) Heft 1 . - S. 88-91.
ISSN 1079-7114
DOI: https://doi.org/10.1103/PhysRevLett.83.88

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Abstract

We have studied experimentally the formation and evolution of sand ripples under water shear flow in a narrow annular channel. The amplitude of the sediment ripples vanishes at a critical value of the shear rate. Near this onset, a band of Fourier modes can be described by exponential growth functions. The growth rates vary linearly with the shear rate. On longer times the sand ripples display complex dynamics.