Effect of grain size sorting on the formation of shoreface-connected sand ridges

Field data of shoreface-connected ridges show persistent spatial variations of mean grain size over the bed forms. In the shore-normal direction, the profiles of bottom topography and mean grain size are approximately 90° out of phase. To investigate the mechanisms responsible for the observed grain...

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Detalles Bibliográficos
Autores: Walgreen, M, Deswart, H E, Calvete Manrique, Daniel|||0000-0002-5402-5137
Tipo de recurso: artículo
Fecha de publicación:2003
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/9411
Acceso en línea:https://hdl.handle.net/2117/9411
https://dx.doi.org/10.1029/2002JC001435
Access Level:acceso abierto
Palabra clave:Sand waves
Sorra -- Platges
Àrees temàtiques de la UPC::Física
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repository_id_str
spelling Effect of grain size sorting on the formation of shoreface-connected sand ridgesWalgreen, MDeswart, H ECalvete Manrique, Daniel|||0000-0002-5402-5137Sand wavesSorra -- PlatgesÀrees temàtiques de la UPC::FísicaField data of shoreface-connected ridges show persistent spatial variations of mean grain size over the bed forms. In the shore-normal direction, the profiles of bottom topography and mean grain size are approximately 90° out of phase. To investigate the mechanisms responsible for the observed grain size distribution and the influence of sediment sorting on the temporal and spatial characteristics of shoreface-connected ridges, a model is developed and analyzed. A linear stability analysis of an alongshore uniform basic state (describing a storm-driven flow on a microtidal inner shelf) with respect to small bottom perturbations is carried out. The transport of nonuniform sediment is described by formulations for both bed load and suspended load, both of which account for dynamic hiding effects. A one-layer model for the bed evolution and a bottom friction term, which depends on the grain size, are used. The initial formation of the ridges is studied for a bimodal sediment mixture. The results of the model indicate that the phase shift between bed topography and mean grain size for shoreface-connected ridges is due to the selective transport via suspended load of grains with different sizes. A net stabilizing effect on the growth of bed forms and enhanced migration are predicted, caused by the bimodal character of the sediment. The wavelengths of the bed forms are only slightly affected. Including a tidal current or a grain size dependent formulation for the bottom friction has no effect on the results. A physical explanation for the model results is also given.20032003-03-0120102010-10-05journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/9411https://dx.doi.org/10.1029/2002JC001435reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivs 3.0 Spainhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/94112026-05-27T15:37:01Z
dc.title.none.fl_str_mv Effect of grain size sorting on the formation of shoreface-connected sand ridges
title Effect of grain size sorting on the formation of shoreface-connected sand ridges
spellingShingle Effect of grain size sorting on the formation of shoreface-connected sand ridges
Walgreen, M
Sand waves
Sorra -- Platges
Àrees temàtiques de la UPC::Física
title_short Effect of grain size sorting on the formation of shoreface-connected sand ridges
title_full Effect of grain size sorting on the formation of shoreface-connected sand ridges
title_fullStr Effect of grain size sorting on the formation of shoreface-connected sand ridges
title_full_unstemmed Effect of grain size sorting on the formation of shoreface-connected sand ridges
title_sort Effect of grain size sorting on the formation of shoreface-connected sand ridges
dc.creator.none.fl_str_mv Walgreen, M
Deswart, H E
Calvete Manrique, Daniel|||0000-0002-5402-5137
author Walgreen, M
author_facet Walgreen, M
Deswart, H E
Calvete Manrique, Daniel|||0000-0002-5402-5137
author_role author
author2 Deswart, H E
Calvete Manrique, Daniel|||0000-0002-5402-5137
author2_role author
author
dc.subject.none.fl_str_mv Sand waves
Sorra -- Platges
Àrees temàtiques de la UPC::Física
topic Sand waves
Sorra -- Platges
Àrees temàtiques de la UPC::Física
description Field data of shoreface-connected ridges show persistent spatial variations of mean grain size over the bed forms. In the shore-normal direction, the profiles of bottom topography and mean grain size are approximately 90° out of phase. To investigate the mechanisms responsible for the observed grain size distribution and the influence of sediment sorting on the temporal and spatial characteristics of shoreface-connected ridges, a model is developed and analyzed. A linear stability analysis of an alongshore uniform basic state (describing a storm-driven flow on a microtidal inner shelf) with respect to small bottom perturbations is carried out. The transport of nonuniform sediment is described by formulations for both bed load and suspended load, both of which account for dynamic hiding effects. A one-layer model for the bed evolution and a bottom friction term, which depends on the grain size, are used. The initial formation of the ridges is studied for a bimodal sediment mixture. The results of the model indicate that the phase shift between bed topography and mean grain size for shoreface-connected ridges is due to the selective transport via suspended load of grains with different sizes. A net stabilizing effect on the growth of bed forms and enhanced migration are predicted, caused by the bimodal character of the sediment. The wavelengths of the bed forms are only slightly affected. Including a tidal current or a grain size dependent formulation for the bottom friction has no effect on the results. A physical explanation for the model results is also given.
publishDate 2003
dc.date.none.fl_str_mv 2003
2003-03-01
2010
2010-10-05
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/9411
https://dx.doi.org/10.1029/2002JC001435
url https://hdl.handle.net/2117/9411
https://dx.doi.org/10.1029/2002JC001435
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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