Influence of bed roughness on dune and megaripple generation


Idier, Deborah and Astruc, Dominique and Hulscher, Suzanne J.M.H. (2004) Influence of bed roughness on dune and megaripple generation. Geophysical Research retters, 31 (L13214). ISSN 0094-8276

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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.
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Copyright:© 2004 American Geophysical Union
Engineering Technology (CTW)
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