On the relationship between flow and suspended sediment transport over the crest of a sand dune, Río Paraná, Argentina

Autores
Shugar, Dan H.; Kostaschuk, Ray; Best, James L.; Parsons, Daniel R.; Lane, Stuart N.; Orfeo, Oscar; Hardy, Richard J.
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The links between large‐scale turbulence and the suspension of sediment over alluvial bedforms have generated considerable interest in the last few decades, with past studies illustrating the origin of such turbulence and its influence on flow resistance, sediment transport and bedform morphology. In this study of turbulence and sediment suspension over large sand dunes in the Río Paraná, Argentina, time series of three‐dimensional velocity, and at‐a‐point suspended sediment concentration and particle‐size, were measured with an acoustic Doppler current profiler and laser in situ scattering transmissometer, respectively. These time series were decomposed using wavelet analysis to investigate the scales of covariation of flow velocity and suspended sediment. The analysis reveals an inverse relationship between streamwise and vertical velocities over the dune crest, where streamwise flow deceleration is linked to the vertical flux of fluid towards the water surface in the form of large turbulent fluid ejections. Regions of high suspended sediment concentration are found to correlate well with such events. The frequencies of these turbulent events have been assessed from wavelet analysis and found to concentrate in two zones that closely match predictions from empirical equations. Such a finding suggests that a combination and interaction of vortex shedding and wake flapping/changing length of the lee‐side separation zone are the principal contributors to the turbulent flow field associated with such large alluvial sand dunes. Wavelet analysis provides insight upon the temporal and spatial evolution of these coherent flow structures, including information on the topology of dune‐related turbulent flow structures. At the flow stage investigated, the turbulent flow events, and their associated high suspended sediment concentrations, are seen to grow with height above the bed until a threshold height (ca 0·45 flow depth) is reached, above which they begin to decay and dissipate.
Fil: Shugar, Dan H.. University of Guelph; Canadá
Fil: Kostaschuk, Ray. University of Guelph; Canadá
Fil: Best, James L.. University of Illinois; Estados Unidos
Fil: Parsons, Daniel R.. University of Leeds; Reino Unido
Fil: Lane, Stuart N.. University Of Durham; Reino Unido
Fil: Orfeo, Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentina
Fil: Hardy, Richard J.. University Of Durham; Reino Unido
Materia
Dune
Flow
Río Paraná
Sediment Transport
Turbulence
Wavelet Analysis
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/42243

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network_name_str CONICET Digital (CONICET)
spelling On the relationship between flow and suspended sediment transport over the crest of a sand dune, Río Paraná, ArgentinaShugar, Dan H.Kostaschuk, RayBest, James L.Parsons, Daniel R.Lane, Stuart N.Orfeo, OscarHardy, Richard J.DuneFlowRío ParanáSediment TransportTurbulenceWavelet Analysishttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The links between large‐scale turbulence and the suspension of sediment over alluvial bedforms have generated considerable interest in the last few decades, with past studies illustrating the origin of such turbulence and its influence on flow resistance, sediment transport and bedform morphology. In this study of turbulence and sediment suspension over large sand dunes in the Río Paraná, Argentina, time series of three‐dimensional velocity, and at‐a‐point suspended sediment concentration and particle‐size, were measured with an acoustic Doppler current profiler and laser in situ scattering transmissometer, respectively. These time series were decomposed using wavelet analysis to investigate the scales of covariation of flow velocity and suspended sediment. The analysis reveals an inverse relationship between streamwise and vertical velocities over the dune crest, where streamwise flow deceleration is linked to the vertical flux of fluid towards the water surface in the form of large turbulent fluid ejections. Regions of high suspended sediment concentration are found to correlate well with such events. The frequencies of these turbulent events have been assessed from wavelet analysis and found to concentrate in two zones that closely match predictions from empirical equations. Such a finding suggests that a combination and interaction of vortex shedding and wake flapping/changing length of the lee‐side separation zone are the principal contributors to the turbulent flow field associated with such large alluvial sand dunes. Wavelet analysis provides insight upon the temporal and spatial evolution of these coherent flow structures, including information on the topology of dune‐related turbulent flow structures. At the flow stage investigated, the turbulent flow events, and their associated high suspended sediment concentrations, are seen to grow with height above the bed until a threshold height (ca 0·45 flow depth) is reached, above which they begin to decay and dissipate.Fil: Shugar, Dan H.. University of Guelph; CanadáFil: Kostaschuk, Ray. University of Guelph; CanadáFil: Best, James L.. University of Illinois; Estados UnidosFil: Parsons, Daniel R.. University of Leeds; Reino UnidoFil: Lane, Stuart N.. University Of Durham; Reino UnidoFil: Orfeo, Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; ArgentinaFil: Hardy, Richard J.. University Of Durham; Reino UnidoWiley Blackwell Publishing, Inc2010-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/42243Shugar, Dan H.; Kostaschuk, Ray; Best, James L.; Parsons, Daniel R.; Lane, Stuart N.; et al.; On the relationship between flow and suspended sediment transport over the crest of a sand dune, Río Paraná, Argentina; Wiley Blackwell Publishing, Inc; Sedimentology; 57; 1; 1-2010; 252-2720037-0746CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-3091.2009.01110.xinfo:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-3091.2009.01110.xinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:04:33Zoai:ri.conicet.gov.ar:11336/42243instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:04:33.506CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv On the relationship between flow and suspended sediment transport over the crest of a sand dune, Río Paraná, Argentina
title On the relationship between flow and suspended sediment transport over the crest of a sand dune, Río Paraná, Argentina
spellingShingle On the relationship between flow and suspended sediment transport over the crest of a sand dune, Río Paraná, Argentina
Shugar, Dan H.
Dune
Flow
Río Paraná
Sediment Transport
Turbulence
Wavelet Analysis
title_short On the relationship between flow and suspended sediment transport over the crest of a sand dune, Río Paraná, Argentina
title_full On the relationship between flow and suspended sediment transport over the crest of a sand dune, Río Paraná, Argentina
title_fullStr On the relationship between flow and suspended sediment transport over the crest of a sand dune, Río Paraná, Argentina
title_full_unstemmed On the relationship between flow and suspended sediment transport over the crest of a sand dune, Río Paraná, Argentina
title_sort On the relationship between flow and suspended sediment transport over the crest of a sand dune, Río Paraná, Argentina
dc.creator.none.fl_str_mv Shugar, Dan H.
Kostaschuk, Ray
Best, James L.
Parsons, Daniel R.
Lane, Stuart N.
Orfeo, Oscar
Hardy, Richard J.
author Shugar, Dan H.
author_facet Shugar, Dan H.
Kostaschuk, Ray
Best, James L.
Parsons, Daniel R.
Lane, Stuart N.
Orfeo, Oscar
Hardy, Richard J.
author_role author
author2 Kostaschuk, Ray
Best, James L.
Parsons, Daniel R.
Lane, Stuart N.
Orfeo, Oscar
Hardy, Richard J.
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Dune
Flow
Río Paraná
Sediment Transport
Turbulence
Wavelet Analysis
topic Dune
Flow
Río Paraná
Sediment Transport
Turbulence
Wavelet Analysis
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The links between large‐scale turbulence and the suspension of sediment over alluvial bedforms have generated considerable interest in the last few decades, with past studies illustrating the origin of such turbulence and its influence on flow resistance, sediment transport and bedform morphology. In this study of turbulence and sediment suspension over large sand dunes in the Río Paraná, Argentina, time series of three‐dimensional velocity, and at‐a‐point suspended sediment concentration and particle‐size, were measured with an acoustic Doppler current profiler and laser in situ scattering transmissometer, respectively. These time series were decomposed using wavelet analysis to investigate the scales of covariation of flow velocity and suspended sediment. The analysis reveals an inverse relationship between streamwise and vertical velocities over the dune crest, where streamwise flow deceleration is linked to the vertical flux of fluid towards the water surface in the form of large turbulent fluid ejections. Regions of high suspended sediment concentration are found to correlate well with such events. The frequencies of these turbulent events have been assessed from wavelet analysis and found to concentrate in two zones that closely match predictions from empirical equations. Such a finding suggests that a combination and interaction of vortex shedding and wake flapping/changing length of the lee‐side separation zone are the principal contributors to the turbulent flow field associated with such large alluvial sand dunes. Wavelet analysis provides insight upon the temporal and spatial evolution of these coherent flow structures, including information on the topology of dune‐related turbulent flow structures. At the flow stage investigated, the turbulent flow events, and their associated high suspended sediment concentrations, are seen to grow with height above the bed until a threshold height (ca 0·45 flow depth) is reached, above which they begin to decay and dissipate.
Fil: Shugar, Dan H.. University of Guelph; Canadá
Fil: Kostaschuk, Ray. University of Guelph; Canadá
Fil: Best, James L.. University of Illinois; Estados Unidos
Fil: Parsons, Daniel R.. University of Leeds; Reino Unido
Fil: Lane, Stuart N.. University Of Durham; Reino Unido
Fil: Orfeo, Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentina
Fil: Hardy, Richard J.. University Of Durham; Reino Unido
description The links between large‐scale turbulence and the suspension of sediment over alluvial bedforms have generated considerable interest in the last few decades, with past studies illustrating the origin of such turbulence and its influence on flow resistance, sediment transport and bedform morphology. In this study of turbulence and sediment suspension over large sand dunes in the Río Paraná, Argentina, time series of three‐dimensional velocity, and at‐a‐point suspended sediment concentration and particle‐size, were measured with an acoustic Doppler current profiler and laser in situ scattering transmissometer, respectively. These time series were decomposed using wavelet analysis to investigate the scales of covariation of flow velocity and suspended sediment. The analysis reveals an inverse relationship between streamwise and vertical velocities over the dune crest, where streamwise flow deceleration is linked to the vertical flux of fluid towards the water surface in the form of large turbulent fluid ejections. Regions of high suspended sediment concentration are found to correlate well with such events. The frequencies of these turbulent events have been assessed from wavelet analysis and found to concentrate in two zones that closely match predictions from empirical equations. Such a finding suggests that a combination and interaction of vortex shedding and wake flapping/changing length of the lee‐side separation zone are the principal contributors to the turbulent flow field associated with such large alluvial sand dunes. Wavelet analysis provides insight upon the temporal and spatial evolution of these coherent flow structures, including information on the topology of dune‐related turbulent flow structures. At the flow stage investigated, the turbulent flow events, and their associated high suspended sediment concentrations, are seen to grow with height above the bed until a threshold height (ca 0·45 flow depth) is reached, above which they begin to decay and dissipate.
publishDate 2010
dc.date.none.fl_str_mv 2010-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/42243
Shugar, Dan H.; Kostaschuk, Ray; Best, James L.; Parsons, Daniel R.; Lane, Stuart N.; et al.; On the relationship between flow and suspended sediment transport over the crest of a sand dune, Río Paraná, Argentina; Wiley Blackwell Publishing, Inc; Sedimentology; 57; 1; 1-2010; 252-272
0037-0746
CONICET Digital
CONICET
url http://hdl.handle.net/11336/42243
identifier_str_mv Shugar, Dan H.; Kostaschuk, Ray; Best, James L.; Parsons, Daniel R.; Lane, Stuart N.; et al.; On the relationship between flow and suspended sediment transport over the crest of a sand dune, Río Paraná, Argentina; Wiley Blackwell Publishing, Inc; Sedimentology; 57; 1; 1-2010; 252-272
0037-0746
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-3091.2009.01110.x
info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-3091.2009.01110.x
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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