Turbulent sediment fluxes along migrating sand dunes

S. Naqshband, J.S. Ribberink, D. Hurther, S.J.M.H. Hulscher

Research output: Contribution to conferenceAbstractOther research output

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Abstract

Dunes are the most common bed forms in lowland river channels consisting of sand and gravel, generated by divergences and convergences of sediment over the bed. They act as roughness to the flow leading to increasing water levels. To be able to model dune evolution and dune dimensions adequately, knowledge on flow and sediment transport processes are crucial. Despite the dominance of suspended load in sand bed rivers (Kostaschuk et al., 2009), it is often assumed that bed load is the dominant transport mechanism in generating and migrating dunes. Suspended load is then neglected in modelling dune morphology and evolution for flood management purposes (Jerolmack et al., 2005; Paarlberg et al., 2009). However, several theoretical as well as field studies have shown significant difference in dune mechanisms under bed load and suspended load dominant transport regimes (Best, 2005). Our aim in this study is to understand and quantify the sediment transport distribution along equilibrium sand dunes (Figure 1). In particular, we are interested in the contribution of turbulent sediment fluxes to the total sediment fluxes.
Original languageEnglish
Pages53-54
Publication statusPublished - 2 Oct 2014
EventNCR-Days 2014 - University of Twente, Enschede, Netherlands
Duration: 2 Oct 20143 Oct 2014

Conference

ConferenceNCR-Days 2014
CountryNetherlands
CityEnschede
Period2/10/143/10/14

Fingerprint

dune
suspended load
sediment
bedload
sediment transport
bedform
river bed
river channel
sand and gravel
transport process
roughness
water level
divergence
sand
modeling

Keywords

  • METIS-305632
  • IR-92177

Cite this

Naqshband, S., Ribberink, J. S., Hurther, D., & Hulscher, S. J. M. H. (2014). Turbulent sediment fluxes along migrating sand dunes. 53-54. Abstract from NCR-Days 2014, Enschede, Netherlands.
Naqshband, S. ; Ribberink, J.S. ; Hurther, D. ; Hulscher, S.J.M.H. / Turbulent sediment fluxes along migrating sand dunes. Abstract from NCR-Days 2014, Enschede, Netherlands.
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abstract = "Dunes are the most common bed forms in lowland river channels consisting of sand and gravel, generated by divergences and convergences of sediment over the bed. They act as roughness to the flow leading to increasing water levels. To be able to model dune evolution and dune dimensions adequately, knowledge on flow and sediment transport processes are crucial. Despite the dominance of suspended load in sand bed rivers (Kostaschuk et al., 2009), it is often assumed that bed load is the dominant transport mechanism in generating and migrating dunes. Suspended load is then neglected in modelling dune morphology and evolution for flood management purposes (Jerolmack et al., 2005; Paarlberg et al., 2009). However, several theoretical as well as field studies have shown significant difference in dune mechanisms under bed load and suspended load dominant transport regimes (Best, 2005). Our aim in this study is to understand and quantify the sediment transport distribution along equilibrium sand dunes (Figure 1). In particular, we are interested in the contribution of turbulent sediment fluxes to the total sediment fluxes.",
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Naqshband, S, Ribberink, JS, Hurther, D & Hulscher, SJMH 2014, 'Turbulent sediment fluxes along migrating sand dunes' NCR-Days 2014, Enschede, Netherlands, 2/10/14 - 3/10/14, pp. 53-54.

Turbulent sediment fluxes along migrating sand dunes. / Naqshband, S.; Ribberink, J.S.; Hurther, D.; Hulscher, S.J.M.H.

2014. 53-54 Abstract from NCR-Days 2014, Enschede, Netherlands.

Research output: Contribution to conferenceAbstractOther research output

TY - CONF

T1 - Turbulent sediment fluxes along migrating sand dunes

AU - Naqshband, S.

AU - Ribberink, J.S.

AU - Hurther, D.

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

PY - 2014/10/2

Y1 - 2014/10/2

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AB - Dunes are the most common bed forms in lowland river channels consisting of sand and gravel, generated by divergences and convergences of sediment over the bed. They act as roughness to the flow leading to increasing water levels. To be able to model dune evolution and dune dimensions adequately, knowledge on flow and sediment transport processes are crucial. Despite the dominance of suspended load in sand bed rivers (Kostaschuk et al., 2009), it is often assumed that bed load is the dominant transport mechanism in generating and migrating dunes. Suspended load is then neglected in modelling dune morphology and evolution for flood management purposes (Jerolmack et al., 2005; Paarlberg et al., 2009). However, several theoretical as well as field studies have shown significant difference in dune mechanisms under bed load and suspended load dominant transport regimes (Best, 2005). Our aim in this study is to understand and quantify the sediment transport distribution along equilibrium sand dunes (Figure 1). In particular, we are interested in the contribution of turbulent sediment fluxes to the total sediment fluxes.

KW - METIS-305632

KW - IR-92177

M3 - Abstract

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ER -

Naqshband S, Ribberink JS, Hurther D, Hulscher SJMH. Turbulent sediment fluxes along migrating sand dunes. 2014. Abstract from NCR-Days 2014, Enschede, Netherlands.