Why do large rivers tend to form multichannel? A field study in the Upper Paraná River

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Federal do Mato Grosso do Sul-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUNIOESTE/Marechal Cândido Rondon-
Autor(es): dc.contributorGraduate Program in Geography of the State University of Western Paraná (UNIOESTE)-
Autor(es): dc.creatorStevaux, José C.-
Autor(es): dc.creatorGon, Priscila P. [UNESP]-
Autor(es): dc.creatorLeli, Isabel T.-
Autor(es): dc.creatorFujita, Rafaela H.-
Data de aceite: dc.date.accessioned2022-08-04T22:10:01Z-
Data de disponibilização: dc.date.available2022-08-04T22:10:01Z-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2020-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.20502/RBG.V22I4.2014-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/221854-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/221854-
Descrição: dc.descriptionAnastomosed rivers include a diverse group of fluvial forms with multiple and interconnected alluvial channels. They occur in a wide range of climates and reliefs and constitute the typical pattern of the mega rivers (Qm > 17,000 m3 s-1). Several authors have assumed that the development of an anabranching formation is the mechanism by which a channel maintains its maximum efficiency. However, this has only been tested by mathematical studies. In this study, we confirm this theory in a 58-km anabranching reach of the Upper Paraná River, through a hydraulic and bathymetric survey of 14 cross-sections. We conclude that where the slope can't increase, the channel reduces its w:d ratio, thereby maintaining its efficiency in the wider sections, according to the specific stream power equation (ω = ρgQs/w). The channel width and alluvial plain width are controlled by allochthonous factors (tectonic lineaments and bank composition). Although the nodal sections have the greatest efficiency, we confirmed that flow efficiency is maintained at a constant level of bedload transport and specific stream power along the anabranching reach.-
Descrição: dc.descriptionCentro de Estudos Ambientais e Marinhos, Universidade de Aveiro-
Descrição: dc.descriptionCentro Nacional de Pesquisa em Energia e Materiais-
Descrição: dc.descriptionBoise State University-
Descrição: dc.descriptionGraduate Program in Geography Universidade Federal do Mato Grosso do Sul Campus de Três Lagoas, MS-
Descrição: dc.descriptionGraduate Program in Geoscience and Environment UNESP IGCE, SP-
Descrição: dc.descriptionGraduate Program in Geography Western State of Paraná UNIOESTE/Marechal Cândido Rondon, PR-
Descrição: dc.descriptionGraduate Program in Geography of the State University of Western Paraná (UNIOESTE), Francisco Beltrão, R-
Descrição: dc.descriptionGraduate Program in Geoscience and Environment UNESP IGCE, SP-
Formato: dc.format967-985-
Idioma: dc.languageen-
Relação: dc.relationRevista Brasileira de Geomorfologia-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectAnabranching river-
Palavras-chave: dc.subjectLarge river-
Palavras-chave: dc.subjectMaximum efficiency concept-
Palavras-chave: dc.subjectParaná River-
Palavras-chave: dc.subjectSpecific stream power-
Título: dc.titleWhy do large rivers tend to form multichannel? A field study in the Upper Paraná River-
Título: dc.titlePor que grandes rios tendem à canalização múltipla? Um estudo de campo no rio Paraná Superior-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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