Influence of bed roughness on dune and megaripple generation

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

Research output: Contribution to journalArticleAcademicpeer-review

26 Citations (Scopus)
237 Downloads (Pure)


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
Issue number13
Publication statusPublished - 2004


  • IR-46110
  • METIS-214058


Dive into the research topics of 'Influence of bed roughness on dune and megaripple generation'. Together they form a unique fingerprint.

Cite this