Influence of bed roughness on dune and megaripple generation | Zendy

Idier Déborah | Zendy; Astruc Dominique | Zendy; Hulscher Suzanne J. M. H. | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Premium

Influence of bed roughness on dune and megaripple generation

Author(s) -

Idier Déborah,

Astruc Dominique,

Hulscher Suzanne J. M. H.

Publication year - 2004

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/2004gl019969

Subject(s) - seabed , geology , surface finish , instability , geotechnical engineering , geomorphology , grain size , bedform , mode (computer interface) , hydraulic roughness , mechanics , sediment transport , sediment , materials science , physics , oceanography , composite material , computer science , operating system

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.

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here

Accelerating Research