On the relationship between flow and suspended sediment transport over the crest of a sand dune, RÃo 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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/42243
Ver los metadatos del registro completo
id |
CONICETDig_27fc90b5250aecade2c5969352789726 |
---|---|
oai_identifier_str |
oai:ri.conicet.gov.ar:11336/42243 |
network_acronym_str |
CONICETDig |
repository_id_str |
3498 |
network_name_str |
CONICET Digital (CONICET) |
spelling |
On the relationship between flow and suspended sediment transport over the crest of a sand dune, RÃo 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, RÃo 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, RÃo Paraná, Argentina |
title |
On the relationship between flow and suspended sediment transport over the crest of a sand dune, RÃo Paraná, Argentina |
spellingShingle |
On the relationship between flow and suspended sediment transport over the crest of a sand dune, RÃo 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, RÃo Paraná, Argentina |
title_full |
On the relationship between flow and suspended sediment transport over the crest of a sand dune, RÃo Paraná, Argentina |
title_fullStr |
On the relationship between flow and suspended sediment transport over the crest of a sand dune, RÃo Paraná, Argentina |
title_full_unstemmed |
On the relationship between flow and suspended sediment transport over the crest of a sand dune, RÃo Paraná, Argentina |
title_sort |
On the relationship between flow and suspended sediment transport over the crest of a sand dune, RÃo 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, RÃo 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, RÃo 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 |
_version_ |
1844613872680435712 |
score |
13.070432 |