Influence of bed roughness on dune and megaripple generation

Deborah Idier; Dominique Astruc; Suzanne J.M.H. Hulscher

doi:10.1029/2004GL019969

Influence of bed roughness on dune and megaripple generation

Deborah Idier, Dominique Astruc, Suzanne J.M.H. Hulscher

Research output: Contribution to journal › Article › Academic › peer-review

27 Citations (Scopus)

326 Downloads (Pure)

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.

Original language	English
Article number	L13214
Number of pages	5
Journal	Geophysical research letters
Volume	31
Issue number	13
DOIs	https://doi.org/10.1029/2004GL019969
Publication status	Published - 2004

Keywords

IR-46110
METIS-214058

Access to Document

10.1029/2004GL019969

Idier2004influenceFinal published version, 267 KB

Cite this

@article{b6e3e670b0944c3097902c8172b4609a,

title = "Influence of bed roughness on dune and megaripple generation",

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.",

keywords = "IR-46110, METIS-214058",

author = "Deborah Idier and Dominique Astruc and Hulscher, {Suzanne J.M.H.}",

year = "2004",

doi = "10.1029/2004GL019969",

language = "English",

volume = "31",

journal = "Geophysical research letters",

issn = "0094-8276",

publisher = "Wiley",

number = "13",

}

TY - JOUR

T1 - Influence of bed roughness on dune and megaripple generation

AU - Idier, Deborah

AU - Astruc, Dominique

AU - Hulscher, Suzanne J.M.H.

PY - 2004

Y1 - 2004

N2 - 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.

AB - 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.

KW - IR-46110

KW - METIS-214058

U2 - 10.1029/2004GL019969

DO - 10.1029/2004GL019969

M3 - Article

SN - 0094-8276

VL - 31

JO - Geophysical research letters

JF - Geophysical research letters

IS - 13

M1 - L13214

ER -

Influence of bed roughness on dune and megaripple generation

Abstract

Keywords

Access to Document

Fingerprint

Cite this