Modeling the influence of storms on sand wave formation: A linear stability approach

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    Abstract

    We present an idealized process-based morphodynamic model to study the effect of storms on sand wave formation. To this end, we include wind waves, wind-driven flow and, in addition to bed load transport, suspended load sediment transport. A linear stability analysis is applied to systematically study the influence of wave and wind conditions on growth and migration rates of small-amplitude wavy bed undulations. The effects of the wind and waves of various magnitudes and directions are investigated. Waves turn out to decrease the growth rate of sand waves, because their effect on the downhill gravitational transport component is stronger than their growth-enhancing effect. The wind wave effect is strongest for wind waves perpendicular to the tidal current. In the case of a symmetrical tidal current, wind-driven flow tends to breach the symmetry, thus causing sand wave migration. Wind effects on sand wave behavior are strongly influenced by the Coriolis effect, in magnitude as well as direction. Stirring due to wind waves enhances sand wave migration. Next to bed load transport, suspended load also has a growing and a decaying mechanism, being the perturbed flow and the perturbed suspended sediment concentration respectively. The decaying mechanism outcompetes the growing mechanism for bed forms with shorter wavelengths, resulting in an increase in the preferred wavelength. Wind waves increase the growth rate due to suspended load, but this is outcompeted by the reduction in growth rate by wind waves due to bed load transport. We conclude that storms significantly influence sand wave dynamics in their formation stage.
    Original languageEnglish
    Pages (from-to)103-116
    JournalContinental shelf research
    Volume137
    DOIs
    Publication statusPublished - 2017

    Fingerprint

    sand wave
    wind wave
    sand
    suspended load
    bedload
    modeling
    tidal current
    wavelength
    Coriolis force
    morphodynamics
    bedform
    tides
    wavelengths
    stability analysis
    suspended sediment
    sediment transport
    symmetry
    effect
    growth retardation

    Keywords

    • METIS-322008

    Cite this

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    title = "Modeling the influence of storms on sand wave formation: A linear stability approach",
    abstract = "We present an idealized process-based morphodynamic model to study the effect of storms on sand wave formation. To this end, we include wind waves, wind-driven flow and, in addition to bed load transport, suspended load sediment transport. A linear stability analysis is applied to systematically study the influence of wave and wind conditions on growth and migration rates of small-amplitude wavy bed undulations. The effects of the wind and waves of various magnitudes and directions are investigated. Waves turn out to decrease the growth rate of sand waves, because their effect on the downhill gravitational transport component is stronger than their growth-enhancing effect. The wind wave effect is strongest for wind waves perpendicular to the tidal current. In the case of a symmetrical tidal current, wind-driven flow tends to breach the symmetry, thus causing sand wave migration. Wind effects on sand wave behavior are strongly influenced by the Coriolis effect, in magnitude as well as direction. Stirring due to wind waves enhances sand wave migration. Next to bed load transport, suspended load also has a growing and a decaying mechanism, being the perturbed flow and the perturbed suspended sediment concentration respectively. The decaying mechanism outcompetes the growing mechanism for bed forms with shorter wavelengths, resulting in an increase in the preferred wavelength. Wind waves increase the growth rate due to suspended load, but this is outcompeted by the reduction in growth rate by wind waves due to bed load transport. We conclude that storms significantly influence sand wave dynamics in their formation stage.",
    keywords = "METIS-322008",
    author = "G.H.P. Campmans and P.C. Roos and {de Vriend}, H.J. and S.J.M.H. Hulscher",
    year = "2017",
    doi = "10.1016/j.csr.2017.02.002",
    language = "English",
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    Modeling the influence of storms on sand wave formation : A linear stability approach. / Campmans, G.H.P.; Roos, P.C.; de Vriend, H.J.; Hulscher, S.J.M.H.

    In: Continental shelf research, Vol. 137, 2017, p. 103-116.

    Research output: Contribution to journalArticleAcademicpeer-review

    TY - JOUR

    T1 - Modeling the influence of storms on sand wave formation

    T2 - A linear stability approach

    AU - Campmans, G.H.P.

    AU - Roos, P.C.

    AU - de Vriend, H.J.

    AU - Hulscher, S.J.M.H.

    PY - 2017

    Y1 - 2017

    N2 - We present an idealized process-based morphodynamic model to study the effect of storms on sand wave formation. To this end, we include wind waves, wind-driven flow and, in addition to bed load transport, suspended load sediment transport. A linear stability analysis is applied to systematically study the influence of wave and wind conditions on growth and migration rates of small-amplitude wavy bed undulations. The effects of the wind and waves of various magnitudes and directions are investigated. Waves turn out to decrease the growth rate of sand waves, because their effect on the downhill gravitational transport component is stronger than their growth-enhancing effect. The wind wave effect is strongest for wind waves perpendicular to the tidal current. In the case of a symmetrical tidal current, wind-driven flow tends to breach the symmetry, thus causing sand wave migration. Wind effects on sand wave behavior are strongly influenced by the Coriolis effect, in magnitude as well as direction. Stirring due to wind waves enhances sand wave migration. Next to bed load transport, suspended load also has a growing and a decaying mechanism, being the perturbed flow and the perturbed suspended sediment concentration respectively. The decaying mechanism outcompetes the growing mechanism for bed forms with shorter wavelengths, resulting in an increase in the preferred wavelength. Wind waves increase the growth rate due to suspended load, but this is outcompeted by the reduction in growth rate by wind waves due to bed load transport. We conclude that storms significantly influence sand wave dynamics in their formation stage.

    AB - We present an idealized process-based morphodynamic model to study the effect of storms on sand wave formation. To this end, we include wind waves, wind-driven flow and, in addition to bed load transport, suspended load sediment transport. A linear stability analysis is applied to systematically study the influence of wave and wind conditions on growth and migration rates of small-amplitude wavy bed undulations. The effects of the wind and waves of various magnitudes and directions are investigated. Waves turn out to decrease the growth rate of sand waves, because their effect on the downhill gravitational transport component is stronger than their growth-enhancing effect. The wind wave effect is strongest for wind waves perpendicular to the tidal current. In the case of a symmetrical tidal current, wind-driven flow tends to breach the symmetry, thus causing sand wave migration. Wind effects on sand wave behavior are strongly influenced by the Coriolis effect, in magnitude as well as direction. Stirring due to wind waves enhances sand wave migration. Next to bed load transport, suspended load also has a growing and a decaying mechanism, being the perturbed flow and the perturbed suspended sediment concentration respectively. The decaying mechanism outcompetes the growing mechanism for bed forms with shorter wavelengths, resulting in an increase in the preferred wavelength. Wind waves increase the growth rate due to suspended load, but this is outcompeted by the reduction in growth rate by wind waves due to bed load transport. We conclude that storms significantly influence sand wave dynamics in their formation stage.

    KW - METIS-322008

    U2 - 10.1016/j.csr.2017.02.002

    DO - 10.1016/j.csr.2017.02.002

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    EP - 116

    JO - Continental shelf research

    JF - Continental shelf research

    SN - 0278-4343

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