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Instabilities in sand ripples

Author

Listed:
  • Jonas Lundbek Hansen

    (Niels Bohr Institute
    Danish Defense Research Establishment)

  • 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)

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.

Suggested Citation

  • Jonas Lundbek Hansen & Martin van Hecke & Anders Haaning & Clive Ellegaard & Ken Haste Andersen & Tomas Bohr & Thomas Sams, 2001. "Instabilities in sand ripples," Nature, Nature, vol. 410(6826), pages 324-324, March.
    • Handle: RePEc:nat:nature:v:410:y:2001:i:6826:d:10.1038_35066631
    DOI: 10.1038/35066631
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