Sand Dunes in Steady Flow at Low Froude Numbers: Dune Height Evolution and Flow Resistance

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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Sand Dunes in Steady Flow at Low Froude Numbers: Dune Height Evolution and Flow Resistance. / Niemann, S. L.; Fredsøe, Jørgen; Jacobsen, Niels Gjøl.

In: Journal of Hydraulic Engineering (New York), Vol. 137, No. 1, 2011, p. 5.

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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Author

Niemann, S. L.; Fredsøe, Jørgen; Jacobsen, Niels Gjøl / Sand Dunes in Steady Flow at Low Froude Numbers: Dune Height Evolution and Flow Resistance.

In: Journal of Hydraulic Engineering (New York), Vol. 137, No. 1, 2011, p. 5.

Publication: Research - peer-reviewJournal article – Annual report year: 2011

Bibtex

@article{4ffdbc15ac00467185168c54a28d738f,
title = "Sand Dunes in Steady Flow at Low Froude Numbers: Dune Height Evolution and Flow Resistance",
publisher = "American Society of Civil Engineers",
author = "Niemann, {S. L.} and Jørgen Fredsøe and Jacobsen, {Niels Gjøl}",
note = "© 2011 ASCE",
year = "2011",
doi = "10.1061/(ASCE)HY.1943-7900.0000255",
volume = "137",
number = "1",
pages = "5",
journal = "Journal of Hydraulic Engineering (New York)",
issn = "0733-9429",

}

RIS

TY - JOUR

T1 - Sand Dunes in Steady Flow at Low Froude Numbers: Dune Height Evolution and Flow Resistance

A1 - Niemann,S. L.

A1 - Fredsøe,Jørgen

A1 - Jacobsen,Niels Gjøl

AU - Niemann,S. L.

AU - Fredsøe,Jørgen

AU - Jacobsen,Niels Gjøl

PB - American Society of Civil Engineers

PY - 2011

Y1 - 2011

N2 - The development of sand dunes in an erodible bed exposed to flowing water is considered using a numerical flow model. The bed is initially given a small perturbation, which is followed in the time domain. Examples are given where a sinusoidal perturbation reaches the fully developed steady equilibrium shape. The flow modeling is based on a k-ω turbulence closure. The sediment transport is assumed to be bed-load only, with an avalanche-like movement on the steep dune front. The model is also found capable of predicting the growth in wavelength if the initially prescribed wavelength is sufficiently short. Results of the dune development are presented for different initial wavelengths. It is demonstrated that an equilibrium shape is developed for a range of wavelength-depth ratios as long as this ratio is sufficiently small.

AB - The development of sand dunes in an erodible bed exposed to flowing water is considered using a numerical flow model. The bed is initially given a small perturbation, which is followed in the time domain. Examples are given where a sinusoidal perturbation reaches the fully developed steady equilibrium shape. The flow modeling is based on a k-ω turbulence closure. The sediment transport is assumed to be bed-load only, with an avalanche-like movement on the steep dune front. The model is also found capable of predicting the growth in wavelength if the initially prescribed wavelength is sufficiently short. Results of the dune development are presented for different initial wavelengths. It is demonstrated that an equilibrium shape is developed for a range of wavelength-depth ratios as long as this ratio is sufficiently small.

KW - Flow resistance

KW - Avalanches

KW - Numerical models

KW - Boundary layer flow

KW - Sediment transport

KW - River morphology

KW - Dune height

KW - Sand waves

UR - http://dx.doi.org/10.1061/(ASCE)HY.1943-7900.0000255

U2 - 10.1061/(ASCE)HY.1943-7900.0000255

DO - 10.1061/(ASCE)HY.1943-7900.0000255

JO - Journal of Hydraulic Engineering (New York)

JF - Journal of Hydraulic Engineering (New York)

SN - 0733-9429

IS - 1

VL - 137

SP - 5

ER -