The alluvial architecture of a suspended sediment dominated meandering river: the Río Bermejo, Argentina

Autores
Sambrook Smith, Gregory H.; Best, James L.; Leroy, Jessica Z.; Orfeo, Oscar
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The alluvial architecture of fine-grained (silt-bed) meandering rivers remainspoorly understood in comparison to the extensive study given to sand-bed andgravel-bed channels. This paucity of knowledge stems, in part, from the difficultyof studying such modern rivers and deriving analogue information fromwhich to inform facies models for ancient sediments. This paper employs anew technique, the parametric echosounder, to quantify the subsurface structureof the Rıo Bermejo, Argentina, which is a predominantly silt-bed river witha large suspended sediment load. These results show that the parametricechosounder can provide high-resolution (decimetre) subsurface imaging fromfine-grained rivers that is equivalent to the more commonly used ground-penetratingradar that has been shown to work well in coarser-grained rivers. Analysisof the data reveals that the alluvial architecture of the Rıo Bermejo ischaracterized by large-scale inclined heterolithic stratification generated bypoint-bar evolution, and associated large-scale scour surfaces that result fromchannel migration. The small-scale and medium-scale structure of the sedimentaryarchitecture is generated by vertical accretion deposits, bed sets associatedwith small bars, dunes and climbing ripples and the cut and fill fromsmall cross-bar channels. This style of alluvial architecture is very differentfrom other modern fine-grained rivers reported in the literature that emphasizethe presence of oblique accretion. The Rıo Bermejo differs from these other riversbecause it is much more active, with very high rates of bank erosion andchannel migration. Modern examples of this type of highly active fine-grainedriver have been reported rarely in the literature, although ancient examples aremore prevalent and show similarities with the alluvial architecture of the RıoBermejo, which thus represents a useful analogue for their identification andinterpretation. Although the full spectrum of the sedimentology of fine-grainedrivers has yet to be revealed, meandering rivers dominated by lateral or obliqueaccretion probably represent end members of such channels, with the specificstyle of sedimentation being controlled by grain size and sediment load characteristics.
Fil: Sambrook Smith, Gregory H.. University Of Birmingham; Reino Unido
Fil: Best, James L.. University of Illinois. Urbana - Champaign; Estados Unidos
Fil: Leroy, Jessica Z.. University of Illinois. Urbana - Champaign; Estados Unidos
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
Materia
ALLUVIAL ARCHITECTURE
BERMEJO RIVER
SILT- BED
ARGENTINA
FINE-GRAINED
MEANDERING
PARAMETRIC ECHOSOUNDER
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/26531

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network_name_str CONICET Digital (CONICET)
spelling The alluvial architecture of a suspended sediment dominated meandering river: the Río Bermejo, ArgentinaSambrook Smith, Gregory H.Best, James L.Leroy, Jessica Z.Orfeo, OscarALLUVIAL ARCHITECTUREBERMEJO RIVERSILT- BEDARGENTINAFINE-GRAINEDMEANDERINGPARAMETRIC ECHOSOUNDERhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The alluvial architecture of fine-grained (silt-bed) meandering rivers remainspoorly understood in comparison to the extensive study given to sand-bed andgravel-bed channels. This paucity of knowledge stems, in part, from the difficultyof studying such modern rivers and deriving analogue information fromwhich to inform facies models for ancient sediments. This paper employs anew technique, the parametric echosounder, to quantify the subsurface structureof the Rıo Bermejo, Argentina, which is a predominantly silt-bed river witha large suspended sediment load. These results show that the parametricechosounder can provide high-resolution (decimetre) subsurface imaging fromfine-grained rivers that is equivalent to the more commonly used ground-penetratingradar that has been shown to work well in coarser-grained rivers. Analysisof the data reveals that the alluvial architecture of the Rıo Bermejo ischaracterized by large-scale inclined heterolithic stratification generated bypoint-bar evolution, and associated large-scale scour surfaces that result fromchannel migration. The small-scale and medium-scale structure of the sedimentaryarchitecture is generated by vertical accretion deposits, bed sets associatedwith small bars, dunes and climbing ripples and the cut and fill fromsmall cross-bar channels. This style of alluvial architecture is very differentfrom other modern fine-grained rivers reported in the literature that emphasizethe presence of oblique accretion. The Rıo Bermejo differs from these other riversbecause it is much more active, with very high rates of bank erosion andchannel migration. Modern examples of this type of highly active fine-grainedriver have been reported rarely in the literature, although ancient examples aremore prevalent and show similarities with the alluvial architecture of the RıoBermejo, which thus represents a useful analogue for their identification andinterpretation. Although the full spectrum of the sedimentology of fine-grainedrivers has yet to be revealed, meandering rivers dominated by lateral or obliqueaccretion probably represent end members of such channels, with the specificstyle of sedimentation being controlled by grain size and sediment load characteristics.Fil: Sambrook Smith, Gregory H.. University Of Birmingham; Reino UnidoFil: Best, James L.. University of Illinois. Urbana - Champaign; Estados UnidosFil: Leroy, Jessica Z.. University of Illinois. Urbana - Champaign; Estados UnidosFil: 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; ArgentinaWiley Blackwell Publishing, Inc2016-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/26531Sambrook Smith, Gregory H.; Best, James L.; Leroy, Jessica Z.; Orfeo, Oscar; The alluvial architecture of a suspended sediment dominated meandering river: the Río Bermejo, Argentina; Wiley Blackwell Publishing, Inc; Sedimentology; 63; 5; 3-2016; 1187-12080037-07460037-0746CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1111/sed.12256/abstractinfo:eu-repo/semantics/altIdentifier/doi/10.1111/sed.12256info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:44:22Zoai:ri.conicet.gov.ar:11336/26531instacron: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 10:44:22.711CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The alluvial architecture of a suspended sediment dominated meandering river: the Río Bermejo, Argentina
title The alluvial architecture of a suspended sediment dominated meandering river: the Río Bermejo, Argentina
spellingShingle The alluvial architecture of a suspended sediment dominated meandering river: the Río Bermejo, Argentina
Sambrook Smith, Gregory H.
ALLUVIAL ARCHITECTURE
BERMEJO RIVER
SILT- BED
ARGENTINA
FINE-GRAINED
MEANDERING
PARAMETRIC ECHOSOUNDER
title_short The alluvial architecture of a suspended sediment dominated meandering river: the Río Bermejo, Argentina
title_full The alluvial architecture of a suspended sediment dominated meandering river: the Río Bermejo, Argentina
title_fullStr The alluvial architecture of a suspended sediment dominated meandering river: the Río Bermejo, Argentina
title_full_unstemmed The alluvial architecture of a suspended sediment dominated meandering river: the Río Bermejo, Argentina
title_sort The alluvial architecture of a suspended sediment dominated meandering river: the Río Bermejo, Argentina
dc.creator.none.fl_str_mv Sambrook Smith, Gregory H.
Best, James L.
Leroy, Jessica Z.
Orfeo, Oscar
author Sambrook Smith, Gregory H.
author_facet Sambrook Smith, Gregory H.
Best, James L.
Leroy, Jessica Z.
Orfeo, Oscar
author_role author
author2 Best, James L.
Leroy, Jessica Z.
Orfeo, Oscar
author2_role author
author
author
dc.subject.none.fl_str_mv ALLUVIAL ARCHITECTURE
BERMEJO RIVER
SILT- BED
ARGENTINA
FINE-GRAINED
MEANDERING
PARAMETRIC ECHOSOUNDER
topic ALLUVIAL ARCHITECTURE
BERMEJO RIVER
SILT- BED
ARGENTINA
FINE-GRAINED
MEANDERING
PARAMETRIC ECHOSOUNDER
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 alluvial architecture of fine-grained (silt-bed) meandering rivers remainspoorly understood in comparison to the extensive study given to sand-bed andgravel-bed channels. This paucity of knowledge stems, in part, from the difficultyof studying such modern rivers and deriving analogue information fromwhich to inform facies models for ancient sediments. This paper employs anew technique, the parametric echosounder, to quantify the subsurface structureof the Rıo Bermejo, Argentina, which is a predominantly silt-bed river witha large suspended sediment load. These results show that the parametricechosounder can provide high-resolution (decimetre) subsurface imaging fromfine-grained rivers that is equivalent to the more commonly used ground-penetratingradar that has been shown to work well in coarser-grained rivers. Analysisof the data reveals that the alluvial architecture of the Rıo Bermejo ischaracterized by large-scale inclined heterolithic stratification generated bypoint-bar evolution, and associated large-scale scour surfaces that result fromchannel migration. The small-scale and medium-scale structure of the sedimentaryarchitecture is generated by vertical accretion deposits, bed sets associatedwith small bars, dunes and climbing ripples and the cut and fill fromsmall cross-bar channels. This style of alluvial architecture is very differentfrom other modern fine-grained rivers reported in the literature that emphasizethe presence of oblique accretion. The Rıo Bermejo differs from these other riversbecause it is much more active, with very high rates of bank erosion andchannel migration. Modern examples of this type of highly active fine-grainedriver have been reported rarely in the literature, although ancient examples aremore prevalent and show similarities with the alluvial architecture of the RıoBermejo, which thus represents a useful analogue for their identification andinterpretation. Although the full spectrum of the sedimentology of fine-grainedrivers has yet to be revealed, meandering rivers dominated by lateral or obliqueaccretion probably represent end members of such channels, with the specificstyle of sedimentation being controlled by grain size and sediment load characteristics.
Fil: Sambrook Smith, Gregory H.. University Of Birmingham; Reino Unido
Fil: Best, James L.. University of Illinois. Urbana - Champaign; Estados Unidos
Fil: Leroy, Jessica Z.. University of Illinois. Urbana - Champaign; Estados Unidos
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
description The alluvial architecture of fine-grained (silt-bed) meandering rivers remainspoorly understood in comparison to the extensive study given to sand-bed andgravel-bed channels. This paucity of knowledge stems, in part, from the difficultyof studying such modern rivers and deriving analogue information fromwhich to inform facies models for ancient sediments. This paper employs anew technique, the parametric echosounder, to quantify the subsurface structureof the Rıo Bermejo, Argentina, which is a predominantly silt-bed river witha large suspended sediment load. These results show that the parametricechosounder can provide high-resolution (decimetre) subsurface imaging fromfine-grained rivers that is equivalent to the more commonly used ground-penetratingradar that has been shown to work well in coarser-grained rivers. Analysisof the data reveals that the alluvial architecture of the Rıo Bermejo ischaracterized by large-scale inclined heterolithic stratification generated bypoint-bar evolution, and associated large-scale scour surfaces that result fromchannel migration. The small-scale and medium-scale structure of the sedimentaryarchitecture is generated by vertical accretion deposits, bed sets associatedwith small bars, dunes and climbing ripples and the cut and fill fromsmall cross-bar channels. This style of alluvial architecture is very differentfrom other modern fine-grained rivers reported in the literature that emphasizethe presence of oblique accretion. The Rıo Bermejo differs from these other riversbecause it is much more active, with very high rates of bank erosion andchannel migration. Modern examples of this type of highly active fine-grainedriver have been reported rarely in the literature, although ancient examples aremore prevalent and show similarities with the alluvial architecture of the RıoBermejo, which thus represents a useful analogue for their identification andinterpretation. Although the full spectrum of the sedimentology of fine-grainedrivers has yet to be revealed, meandering rivers dominated by lateral or obliqueaccretion probably represent end members of such channels, with the specificstyle of sedimentation being controlled by grain size and sediment load characteristics.
publishDate 2016
dc.date.none.fl_str_mv 2016-03
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/11336/26531
Sambrook Smith, Gregory H.; Best, James L.; Leroy, Jessica Z.; Orfeo, Oscar; The alluvial architecture of a suspended sediment dominated meandering river: the Río Bermejo, Argentina; Wiley Blackwell Publishing, Inc; Sedimentology; 63; 5; 3-2016; 1187-1208
0037-0746
0037-0746
CONICET Digital
CONICET
url http://hdl.handle.net/11336/26531
identifier_str_mv Sambrook Smith, Gregory H.; Best, James L.; Leroy, Jessica Z.; Orfeo, Oscar; The alluvial architecture of a suspended sediment dominated meandering river: the Río Bermejo, Argentina; Wiley Blackwell Publishing, Inc; Sedimentology; 63; 5; 3-2016; 1187-1208
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/url/http://onlinelibrary.wiley.com/doi/10.1111/sed.12256/abstract
info:eu-repo/semantics/altIdentifier/doi/10.1111/sed.12256
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/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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