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Article Dans Une Revue Geophysical Research Letters Année : 2004

Influence of bed roughness on dune and megaripple generation

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Résumé

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.

Dates et versions

hal-00557292 , version 1 (18-01-2011)

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Déborah Idier, Dominique Astruc, Suzanne J.M.H. Hulscher. Influence of bed roughness on dune and megaripple generation. Geophysical Research Letters, 2004, 31, pp.L13214. ⟨10.1029/2004GL019969⟩. ⟨hal-00557292⟩
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