Influence of bed roughness on dune and megaripple generation

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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.
Item Type:Article
Copyright:© 2004 American Geophysical Union
Faculty:
Engineering Technology (CTW)
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Link to this item:http://purl.utwente.nl/publications/46110
Official URL:http://dx.doi.org/10.1029/2004GL019969
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