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 Letters, 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)
Research Group:	Water Engineering and Management (WEM)
Link to this item:	http://purl.utwente.nl/publications/46110
Official URL:	http://dx.doi.org/10.1029/2004GL019969
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