Instabilities in sand ripples

Jonas Lundbek Hansen, Martin van Hecke, Anders Haaning, Clive Ellegaard, Ken Haste Andersen, Tomas Bohr () and Thomas Sams
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Jonas Lundbek Hansen: Niels Bohr Institute
Martin van Hecke: Niels Bohr Institute
Anders Haaning: Niels Bohr Institute
Clive Ellegaard: Niels Bohr Institute
Ken Haste Andersen: ISVA, Danish Technical University
Tomas Bohr: Physics Institute, Danish Technical University
Thomas Sams: Danish Defense Research Establishment

Nature, 2001, vol. 410, issue 6826, 324-324

Abstract: Abstract Sand ripples are seen below shallow wavy water and are formed whenever water oscillates over a bed of sand. Here we analyse the instabilities that can upset this perfect patterning when the ripples are subjected to large changes in driving amplitude or frequency, causing them to deform both parallel and transverse to their crests. Our results reveal new pattern-forming instabilities in granular matter exposed to fluid flow with strong vorticity.

Date: 2001
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DOI: 10.1038/35066631

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