Experimental evidence for turbulent sediment flux constituting a large portion of the total sediment flux along migrating sand dunes

S. Naqshband, J.S. Ribberink, D. Hurther, P.A. Barraud, S.J.M.H. Hulscher

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Abstract

Accurate estimation of sediment transport is critical for many fluvial processes but remains challenging due to high‐frequency dynamics. Using novel acoustic flow instrumentation, we quantified the contribution of turbulent bed and suspended sediment fluxes to the total sediment fluxes along an entire dune profile and over the full flow depth. We found that over the dune stoss side and in the bed load layer, the turbulent mean streamwise flux is negative and reaches up to 40% of the total mean streamwise flux. Over the lee side, where turbulent intensities are highest, the contribution of the turbulent mean streamwise flux to the total mean streamwise flux is larger and reaches up to 50%. The mean vertical turbulent flux along the entire dune bed and in the bed load layer reaches nearly 30% of the total mean vertical flux. Turbulent sediment flux may thus constitute a large component of the total flux.
Original languageEnglish
Pages (from-to)8870-8878
JournalGeophysical research letters
Volume41
Issue number24
DOIs
Publication statusPublished - 2014

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dunes
dune
sediments
bedload
sediment
fluvial process
beds
suspended sediment
instrumentation
sediment transport
acoustics

Keywords

  • METIS-309206
  • IR-104809

Cite this

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title = "Experimental evidence for turbulent sediment flux constituting a large portion of the total sediment flux along migrating sand dunes",
abstract = "Accurate estimation of sediment transport is critical for many fluvial processes but remains challenging due to high‐frequency dynamics. Using novel acoustic flow instrumentation, we quantified the contribution of turbulent bed and suspended sediment fluxes to the total sediment fluxes along an entire dune profile and over the full flow depth. We found that over the dune stoss side and in the bed load layer, the turbulent mean streamwise flux is negative and reaches up to 40{\%} of the total mean streamwise flux. Over the lee side, where turbulent intensities are highest, the contribution of the turbulent mean streamwise flux to the total mean streamwise flux is larger and reaches up to 50{\%}. The mean vertical turbulent flux along the entire dune bed and in the bed load layer reaches nearly 30{\%} of the total mean vertical flux. Turbulent sediment flux may thus constitute a large component of the total flux.",
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author = "S. Naqshband and J.S. Ribberink and D. Hurther and P.A. Barraud and S.J.M.H. Hulscher",
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Experimental evidence for turbulent sediment flux constituting a large portion of the total sediment flux along migrating sand dunes. / Naqshband, S.; Ribberink, J.S.; Hurther, D.; Barraud, P.A.; Hulscher, S.J.M.H.

In: Geophysical research letters, Vol. 41, No. 24, 2014, p. 8870-8878.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Experimental evidence for turbulent sediment flux constituting a large portion of the total sediment flux along migrating sand dunes

AU - Naqshband, S.

AU - Ribberink, J.S.

AU - Hurther, D.

AU - Barraud, P.A.

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

PY - 2014

Y1 - 2014

N2 - Accurate estimation of sediment transport is critical for many fluvial processes but remains challenging due to high‐frequency dynamics. Using novel acoustic flow instrumentation, we quantified the contribution of turbulent bed and suspended sediment fluxes to the total sediment fluxes along an entire dune profile and over the full flow depth. We found that over the dune stoss side and in the bed load layer, the turbulent mean streamwise flux is negative and reaches up to 40% of the total mean streamwise flux. Over the lee side, where turbulent intensities are highest, the contribution of the turbulent mean streamwise flux to the total mean streamwise flux is larger and reaches up to 50%. The mean vertical turbulent flux along the entire dune bed and in the bed load layer reaches nearly 30% of the total mean vertical flux. Turbulent sediment flux may thus constitute a large component of the total flux.

AB - Accurate estimation of sediment transport is critical for many fluvial processes but remains challenging due to high‐frequency dynamics. Using novel acoustic flow instrumentation, we quantified the contribution of turbulent bed and suspended sediment fluxes to the total sediment fluxes along an entire dune profile and over the full flow depth. We found that over the dune stoss side and in the bed load layer, the turbulent mean streamwise flux is negative and reaches up to 40% of the total mean streamwise flux. Over the lee side, where turbulent intensities are highest, the contribution of the turbulent mean streamwise flux to the total mean streamwise flux is larger and reaches up to 50%. The mean vertical turbulent flux along the entire dune bed and in the bed load layer reaches nearly 30% of the total mean vertical flux. Turbulent sediment flux may thus constitute a large component of the total flux.

KW - METIS-309206

KW - IR-104809

U2 - 10.1002/2014GL062322

DO - 10.1002/2014GL062322

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SP - 8870

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JO - Geophysical research letters

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SN - 0094-8276

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