Temporal and spatial adjustments of channel migration and planform geometry: responses to ENSO driven climate anomalies on the tropical freely-meandering Aguapeí River, São Paulo, Brazil

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorSuizu, Tainá Medeiros-
Autor(es): dc.creatorNanson, Gerald C.-
Data de aceite: dc.date.accessioned2021-03-11T00:47:48Z-
Data de disponibilização: dc.date.available2021-03-11T00:47:48Z-
Data de envio: dc.date.issued2018-12-11-
Data de envio: dc.date.issued2018-12-11-
Data de envio: dc.date.issued2018-06-30-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1002/esp.4343-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/175890-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/175890-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionProcesso FAPESP: 2013/04284-3-
Descrição: dc.descriptionProcesso FAPESP: 2014/02298-0-
Descrição: dc.descriptionTwo reaches of Aguapeí River, a left-bank tributary of the Paraná River in western São Paulo state, Brazil, were studied with the objective of assessing the role of bend curvature on channel migration in this wet-tropical system and examining if land-use changes or ENSO (El Niño Southern Oscillation) driven climate anomalies over nearly half a century have changed migration behaviour and planform geometry. Meander-bend migration rates and morphometric parameters including meander-bend curvature, sinuosity, meander wavelength and channel width, were measured and the frequency of bend cutoffs was analysed in order to determine the rate of change of channel adjustment over a 48 year period to 2010. Results show that maximum average channel migration rates occur in bends with curvatures of about 2–3 rc/w, similar to other previously studied temperate and subarctic freely meandering rivers although not as pronounced and with a tendency to favour tighter curvature. From 1962 to 2010 the Aguapeí River has undergone a significant reduction in sinuosity, a shift from tightly curving to more open bends, an overall decline in channel migration rates, an associated decrease in the frequency of neck-cutoffs and an overall increase in channel width. As the majority of the drainage basin (96%) was already deforested in 1962, channel form and process changes were, unlike an interpretation for an adjacent river system, not attributed to altered land-use but rather to a sharp ENSO-driven increase in the magnitude of peak flow-discharges of some 32% since 1972. In summary, this research revealed that recent climate and associated flow regime changes are having a pronounced effect on river channel behaviour in the Aguapeí River investigated here. Copyright © 2018 John Wiley & Sons, Ltd.-
Formato: dc.format1636-1647-
Idioma: dc.languageen-
Relação: dc.relationEarth Surface Processes and Landforms-
Relação: dc.relation1,493-
Direitos: dc.rightsclosedAccess-
Palavras-chave: dc.subjectAguapeí River-
Palavras-chave: dc.subjectchannel migration-
Palavras-chave: dc.subjectchannel planform-change-
Palavras-chave: dc.subjectENSO climate-change-
Palavras-chave: dc.subjectfreely-meandering rivers-
Título: dc.titleTemporal and spatial adjustments of channel migration and planform geometry: responses to ENSO driven climate anomalies on the tropical freely-meandering Aguapeí River, São Paulo, Brazil-
Tipo de arquivo: dc.typelivro digital-
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