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dc.contributor.author
Shugar, Dan H.
dc.contributor.author
Kostaschuk, Ray
dc.contributor.author
Best, James L.
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dc.contributor.author
Parsons, Daniel R.
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dc.contributor.author
Lane, Stuart N.
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dc.contributor.author
Orfeo, Oscar
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dc.contributor.author
Hardy, Richard J.
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dc.date.available
2018-04-17T14:30:10Z
dc.date.issued
2010-01
dc.identifier.citation
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
dc.identifier.issn
0037-0746
dc.identifier.uri
http://hdl.handle.net/11336/42243
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley Blackwell Publishing, Inc
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Dune
dc.subject
Flow
dc.subject
Río Paraná
dc.subject
Sediment Transport
dc.subject
Turbulence
dc.subject
Wavelet Analysis
dc.subject.classification
Meteorología y Ciencias Atmosféricas
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
On the relationship between flow and suspended sediment transport over the crest of a sand dune, RÃo Paraná, Argentina
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-04-05T18:17:37Z
dc.journal.volume
57
dc.journal.number
1
dc.journal.pagination
252-272
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Shugar, Dan H.. University of Guelph; Canadá
dc.description.fil
Fil: Kostaschuk, Ray. University of Guelph; Canadá
dc.description.fil
Fil: Best, James L.. University of Illinois; Estados Unidos
dc.description.fil
Fil: Parsons, Daniel R.. University of Leeds; Reino Unido
dc.description.fil
Fil: Lane, Stuart N.. University Of Durham; Reino Unido
dc.description.fil
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
dc.description.fil
Fil: Hardy, Richard J.. University Of Durham; Reino Unido
dc.journal.title
Sedimentology
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1111/j.1365-3091.2009.01110.x
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-3091.2009.01110.x
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