Influence of bed roughness on dune and megaripple generation

Deborah Idier, Dominique Astruc, Suzanne J.M.H. Hulscher

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24 Citations (Scopus)
166 Downloads (Pure)

Abstract

Richards [1980] conjectured that megaripples of the continental shelf are due to a seabed instability in the presence of seabed ripples. Towards a better understanding of this megaripple formation process, we use a morphodynamical numerical model to investigate the bed roughness influence on the bed load¿induced linear stability of a sandy bed. We find that the linearly most amplified mode shifts from a dune mode (grain roughness) towards a megaripple mode (large bed roughness). Then, we discuss how megaripples could be generated over a flat bed and over dunes.
Original languageEnglish
Article numberL13214
Number of pages5
JournalGeophysical research letters
Volume31
Issue number13
DOIs
Publication statusPublished - 2004

Keywords

  • IR-46110
  • METIS-214058

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