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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/37002
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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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13.070432 |