Causes of rapid mixing at a junction of two large rivers: Río Paraná and Río Paraguay, Argentina

Autores
Lane, Stuart N.; Parsons, Daniel R.; Best, James L.; Orfeo, Oscar; Kostaschuk, R. A.; Hardy, Richard J.
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Airborne and satellite observations show that when large rivers join they can take hundreds of kilometers to mix completely but, on occasion, may mix very rapidly. Application of established semitheoretical analyses shows that long mixing lengths should be expected. The first measurements of mixing processes at a large river junction (Río Paraná and Río Paraguay, Argentina, combined width ∼2.8 km) are presented at two occasions: first when they mix in >400 km, and second when mixing is complete in only 8 km downstream of the junction. For the case of slower mixing, at-a-point surveys showed that mixing driven by turbulent shear associated with a near-vertical shear layer was restricted to close to the junction (to 0.272 multiples of the postconfluence width downstream). Transect surveys showed penetration of more turbid water from the Río Paraguay underneath the Río Paraná, but this was insufficient to promote more rapid mixing. There was no clear channel-scale circulation present and slow mixing was compounded by reverse topographic forcing on the mainstream Río Paraná side of the river. This kept more turbid water on the Río Paraguay side of the river, close to the bed. In the case of rapid mixing, we found clear channel-scale circulation. The momentum ratio between the combining flows reinforced the effects of the discordance in bed height between the tributaries at the confluence and allowed penetration of more turbid Río Paraguay water further across the channel width deeper within the flow. The importance of the interaction between momentum ratio and bed morphology at channel junctions makes mixing rates at the confluence dependent upon basin-scale hydrological response, which is more likely to differ between large confluent rivers than small rivers, as a result of the different climatic/topographic zones that they may capture.
Fil: Lane, Stuart N.. University Of Durham; Reino Unido
Fil: Parsons, Daniel R.. University Of Hull; Reino Unido
Fil: Best, James L.. 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
Fil: Kostaschuk, R. A.. University of Guelph; Canadá
Fil: Hardy, Richard J.. University Of Durham; Reino Unido
Materia
MIXING
JUNCTION
PARANÁ
PARAGUAY
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:11336/37002

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spelling Causes of rapid mixing at a junction of two large rivers: Río Paraná and Río Paraguay, ArgentinaLane, Stuart N.Parsons, Daniel R.Best, James L.Orfeo, OscarKostaschuk, R. A.Hardy, Richard J.MIXINGJUNCTIONPARANÁPARAGUAYhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Airborne and satellite observations show that when large rivers join they can take hundreds of kilometers to mix completely but, on occasion, may mix very rapidly. Application of established semitheoretical analyses shows that long mixing lengths should be expected. The first measurements of mixing processes at a large river junction (Río Paraná and Río Paraguay, Argentina, combined width ∼2.8 km) are presented at two occasions: first when they mix in >400 km, and second when mixing is complete in only 8 km downstream of the junction. For the case of slower mixing, at-a-point surveys showed that mixing driven by turbulent shear associated with a near-vertical shear layer was restricted to close to the junction (to 0.272 multiples of the postconfluence width downstream). Transect surveys showed penetration of more turbid water from the Río Paraguay underneath the Río Paraná, but this was insufficient to promote more rapid mixing. There was no clear channel-scale circulation present and slow mixing was compounded by reverse topographic forcing on the mainstream Río Paraná side of the river. This kept more turbid water on the Río Paraguay side of the river, close to the bed. In the case of rapid mixing, we found clear channel-scale circulation. The momentum ratio between the combining flows reinforced the effects of the discordance in bed height between the tributaries at the confluence and allowed penetration of more turbid Río Paraguay water further across the channel width deeper within the flow. The importance of the interaction between momentum ratio and bed morphology at channel junctions makes mixing rates at the confluence dependent upon basin-scale hydrological response, which is more likely to differ between large confluent rivers than small rivers, as a result of the different climatic/topographic zones that they may capture.Fil: Lane, Stuart N.. University Of Durham; Reino UnidoFil: Parsons, Daniel R.. University Of Hull; Reino UnidoFil: Best, James L.. 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; ArgentinaFil: Kostaschuk, R. A.. University of Guelph; CanadáFil: Hardy, Richard J.. University Of Durham; Reino UnidoBlackwell Publishing Ltd2008-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/37002Lane, Stuart N.; Parsons, Daniel R.; Best, James L.; Orfeo, Oscar; Kostaschuk, R. A.; et al.; Causes of rapid mixing at a junction of two large rivers: Río Paraná and Río Paraguay, Argentina; Blackwell Publishing Ltd; Journal of Geophysical Research: Earth Surface; 113; 2; 6-2008; 1-162169-9011CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1029/2006JF000745/abstractinfo:eu-repo/semantics/altIdentifier/doi/10.1029/2006JF000745info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:44:22Zoai:ri.conicet.gov.ar:11336/37002instacron: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 09:44:23.059CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Causes of rapid mixing at a junction of two large rivers: Río Paraná and Río Paraguay, Argentina
title Causes of rapid mixing at a junction of two large rivers: Río Paraná and Río Paraguay, Argentina
spellingShingle Causes of rapid mixing at a junction of two large rivers: Río Paraná and Río Paraguay, Argentina
Lane, Stuart N.
MIXING
JUNCTION
PARANÁ
PARAGUAY
title_short Causes of rapid mixing at a junction of two large rivers: Río Paraná and Río Paraguay, Argentina
title_full Causes of rapid mixing at a junction of two large rivers: Río Paraná and Río Paraguay, Argentina
title_fullStr Causes of rapid mixing at a junction of two large rivers: Río Paraná and Río Paraguay, Argentina
title_full_unstemmed Causes of rapid mixing at a junction of two large rivers: Río Paraná and Río Paraguay, Argentina
title_sort Causes of rapid mixing at a junction of two large rivers: Río Paraná and Río Paraguay, Argentina
dc.creator.none.fl_str_mv Lane, Stuart N.
Parsons, Daniel R.
Best, James L.
Orfeo, Oscar
Kostaschuk, R. A.
Hardy, Richard J.
author Lane, Stuart N.
author_facet Lane, Stuart N.
Parsons, Daniel R.
Best, James L.
Orfeo, Oscar
Kostaschuk, R. A.
Hardy, Richard J.
author_role author
author2 Parsons, Daniel R.
Best, James L.
Orfeo, Oscar
Kostaschuk, R. A.
Hardy, Richard J.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv MIXING
JUNCTION
PARANÁ
PARAGUAY
topic MIXING
JUNCTION
PARANÁ
PARAGUAY
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Airborne and satellite observations show that when large rivers join they can take hundreds of kilometers to mix completely but, on occasion, may mix very rapidly. Application of established semitheoretical analyses shows that long mixing lengths should be expected. The first measurements of mixing processes at a large river junction (Río Paraná and Río Paraguay, Argentina, combined width ∼2.8 km) are presented at two occasions: first when they mix in >400 km, and second when mixing is complete in only 8 km downstream of the junction. For the case of slower mixing, at-a-point surveys showed that mixing driven by turbulent shear associated with a near-vertical shear layer was restricted to close to the junction (to 0.272 multiples of the postconfluence width downstream). Transect surveys showed penetration of more turbid water from the Río Paraguay underneath the Río Paraná, but this was insufficient to promote more rapid mixing. There was no clear channel-scale circulation present and slow mixing was compounded by reverse topographic forcing on the mainstream Río Paraná side of the river. This kept more turbid water on the Río Paraguay side of the river, close to the bed. In the case of rapid mixing, we found clear channel-scale circulation. The momentum ratio between the combining flows reinforced the effects of the discordance in bed height between the tributaries at the confluence and allowed penetration of more turbid Río Paraguay water further across the channel width deeper within the flow. The importance of the interaction between momentum ratio and bed morphology at channel junctions makes mixing rates at the confluence dependent upon basin-scale hydrological response, which is more likely to differ between large confluent rivers than small rivers, as a result of the different climatic/topographic zones that they may capture.
Fil: Lane, Stuart N.. University Of Durham; Reino Unido
Fil: Parsons, Daniel R.. University Of Hull; Reino Unido
Fil: Best, James L.. 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
Fil: Kostaschuk, R. A.. University of Guelph; Canadá
Fil: Hardy, Richard J.. University Of Durham; Reino Unido
description Airborne and satellite observations show that when large rivers join they can take hundreds of kilometers to mix completely but, on occasion, may mix very rapidly. Application of established semitheoretical analyses shows that long mixing lengths should be expected. The first measurements of mixing processes at a large river junction (Río Paraná and Río Paraguay, Argentina, combined width ∼2.8 km) are presented at two occasions: first when they mix in >400 km, and second when mixing is complete in only 8 km downstream of the junction. For the case of slower mixing, at-a-point surveys showed that mixing driven by turbulent shear associated with a near-vertical shear layer was restricted to close to the junction (to 0.272 multiples of the postconfluence width downstream). Transect surveys showed penetration of more turbid water from the Río Paraguay underneath the Río Paraná, but this was insufficient to promote more rapid mixing. There was no clear channel-scale circulation present and slow mixing was compounded by reverse topographic forcing on the mainstream Río Paraná side of the river. This kept more turbid water on the Río Paraguay side of the river, close to the bed. In the case of rapid mixing, we found clear channel-scale circulation. The momentum ratio between the combining flows reinforced the effects of the discordance in bed height between the tributaries at the confluence and allowed penetration of more turbid Río Paraguay water further across the channel width deeper within the flow. The importance of the interaction between momentum ratio and bed morphology at channel junctions makes mixing rates at the confluence dependent upon basin-scale hydrological response, which is more likely to differ between large confluent rivers than small rivers, as a result of the different climatic/topographic zones that they may capture.
publishDate 2008
dc.date.none.fl_str_mv 2008-06
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/11336/37002
Lane, Stuart N.; Parsons, Daniel R.; Best, James L.; Orfeo, Oscar; Kostaschuk, R. A.; et al.; Causes of rapid mixing at a junction of two large rivers: Río Paraná and Río Paraguay, Argentina; Blackwell Publishing Ltd; Journal of Geophysical Research: Earth Surface; 113; 2; 6-2008; 1-16
2169-9011
CONICET Digital
CONICET
url http://hdl.handle.net/11336/37002
identifier_str_mv Lane, Stuart N.; Parsons, Daniel R.; Best, James L.; Orfeo, Oscar; Kostaschuk, R. A.; et al.; Causes of rapid mixing at a junction of two large rivers: Río Paraná and Río Paraguay, Argentina; Blackwell Publishing Ltd; Journal of Geophysical Research: Earth Surface; 113; 2; 6-2008; 1-16
2169-9011
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/10.1029/2006JF000745/abstract
info:eu-repo/semantics/altIdentifier/doi/10.1029/2006JF000745
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 Blackwell Publishing Ltd
publisher.none.fl_str_mv Blackwell Publishing Ltd
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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