Fluvial responses to external and internal forcing: Upper Holocene dynamics in a low latitude semi-arid region in South America

Detalhes bibliográficos
Autor(a) principal: Lima, Kleber Carvalho
Data de Publicação: 2021
Outros Autores: Perez Filho, Archimedes, Lupinacci, Cenira Maria [UNESP], Valézio, Éverton Vinicius, Góes, Liliane Matos
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1016/j.jsames.2021.103545
http://hdl.handle.net/11449/229447
Resumo: River streams are sensitive to environmental changes in drainage basins in response to external and internal forcing. These changes lead to drainage channel adjustments and may alter erosion-sedimentation cycles along valleys, as well as short and long term geomorphological evolution. Concerning the low latitude semi-arid region in South America, fluvial responses to environmental changes during the Upper Holocene have still not been adequately assessed, contrasting with evaluations in river drylands located in middle latitudes. To collaborate with assessments on Upper Holocene climatic fluctuations, alluvial deposits at the Itapicuru River, located in the Brazilian semi-arid, were analyzed to understand this river's dynamics in the last 5 ka and its relationship with both intrinsic and extrinsic factors. The following analyses were performed: [1] spatial terrace distribution throughout the river's longitudinal profile, [2] stratigraphic section assessments, [3] OSL dating, to estimate surface time elaboration, and [4] age correlations with regional paleoclimatic models. In the last 2.2 ka, downcutting and lateral migration occurred at the same time due to fluvial discharge changes over centuries and decades. Semi-arid conditions, such as those currently observed, prevailed throughout the drainage basin, with wet intervals identified upstream. Humidity variations were responsible for middle valley incision and deposition, forming terrace, bars, and natural levees. These findings indicate that, at least in our case study, intrinsic factors had big importance to control the fluvial dynamics since the establishment of the semi-arid low latitude climatic conditions.
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spelling Fluvial responses to external and internal forcing: Upper Holocene dynamics in a low latitude semi-arid region in South AmericaAllogenic riversDrylandsItapicuru RiverOSL DatingTropical zonesRiver streams are sensitive to environmental changes in drainage basins in response to external and internal forcing. These changes lead to drainage channel adjustments and may alter erosion-sedimentation cycles along valleys, as well as short and long term geomorphological evolution. Concerning the low latitude semi-arid region in South America, fluvial responses to environmental changes during the Upper Holocene have still not been adequately assessed, contrasting with evaluations in river drylands located in middle latitudes. To collaborate with assessments on Upper Holocene climatic fluctuations, alluvial deposits at the Itapicuru River, located in the Brazilian semi-arid, were analyzed to understand this river's dynamics in the last 5 ka and its relationship with both intrinsic and extrinsic factors. The following analyses were performed: [1] spatial terrace distribution throughout the river's longitudinal profile, [2] stratigraphic section assessments, [3] OSL dating, to estimate surface time elaboration, and [4] age correlations with regional paleoclimatic models. In the last 2.2 ka, downcutting and lateral migration occurred at the same time due to fluvial discharge changes over centuries and decades. Semi-arid conditions, such as those currently observed, prevailed throughout the drainage basin, with wet intervals identified upstream. Humidity variations were responsible for middle valley incision and deposition, forming terrace, bars, and natural levees. These findings indicate that, at least in our case study, intrinsic factors had big importance to control the fluvial dynamics since the establishment of the semi-arid low latitude climatic conditions.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Department of Geography Campus Garanhuns University of Pernambuco (UPE)Department of Geography Institute of Geoscience State University of Campinas (UNICAMP)Department of Geography and Environmental Planning Campus Rio Claro São Paulo State University “Júlio de Mesquita Filho” (UNESP)Department of Geography Institute of Geoscience University of Campinas (UNICAMP)Department of Humanities Campus Jacobina University of Bahia State (UNEB)Department of Geography and Environmental Planning Campus Rio Claro São Paulo State University “Júlio de Mesquita Filho” (UNESP)CAPES: 001FAPESP: 2012/00145–6FAPESP: 408333/2013–8University of Pernambuco (UPE)Universidade Estadual de Campinas (UNICAMP)Universidade Estadual Paulista (UNESP)University of Bahia State (UNEB)Lima, Kleber CarvalhoPerez Filho, ArchimedesLupinacci, Cenira Maria [UNESP]Valézio, Éverton ViniciusGóes, Liliane Matos2022-04-29T08:32:36Z2022-04-29T08:32:36Z2021-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.jsames.2021.103545Journal of South American Earth Sciences, v. 112.0895-9811http://hdl.handle.net/11449/22944710.1016/j.jsames.2021.1035452-s2.0-85114147773Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of South American Earth Sciencesinfo:eu-repo/semantics/openAccess2022-04-29T08:32:36Zoai:repositorio.unesp.br:11449/229447Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T22:17:00.273368Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Fluvial responses to external and internal forcing: Upper Holocene dynamics in a low latitude semi-arid region in South America
title Fluvial responses to external and internal forcing: Upper Holocene dynamics in a low latitude semi-arid region in South America
spellingShingle Fluvial responses to external and internal forcing: Upper Holocene dynamics in a low latitude semi-arid region in South America
Lima, Kleber Carvalho
Allogenic rivers
Drylands
Itapicuru River
OSL Dating
Tropical zones
title_short Fluvial responses to external and internal forcing: Upper Holocene dynamics in a low latitude semi-arid region in South America
title_full Fluvial responses to external and internal forcing: Upper Holocene dynamics in a low latitude semi-arid region in South America
title_fullStr Fluvial responses to external and internal forcing: Upper Holocene dynamics in a low latitude semi-arid region in South America
title_full_unstemmed Fluvial responses to external and internal forcing: Upper Holocene dynamics in a low latitude semi-arid region in South America
title_sort Fluvial responses to external and internal forcing: Upper Holocene dynamics in a low latitude semi-arid region in South America
author Lima, Kleber Carvalho
author_facet Lima, Kleber Carvalho
Perez Filho, Archimedes
Lupinacci, Cenira Maria [UNESP]
Valézio, Éverton Vinicius
Góes, Liliane Matos
author_role author
author2 Perez Filho, Archimedes
Lupinacci, Cenira Maria [UNESP]
Valézio, Éverton Vinicius
Góes, Liliane Matos
author2_role author
author
author
author
dc.contributor.none.fl_str_mv University of Pernambuco (UPE)
Universidade Estadual de Campinas (UNICAMP)
Universidade Estadual Paulista (UNESP)
University of Bahia State (UNEB)
dc.contributor.author.fl_str_mv Lima, Kleber Carvalho
Perez Filho, Archimedes
Lupinacci, Cenira Maria [UNESP]
Valézio, Éverton Vinicius
Góes, Liliane Matos
dc.subject.por.fl_str_mv Allogenic rivers
Drylands
Itapicuru River
OSL Dating
Tropical zones
topic Allogenic rivers
Drylands
Itapicuru River
OSL Dating
Tropical zones
description River streams are sensitive to environmental changes in drainage basins in response to external and internal forcing. These changes lead to drainage channel adjustments and may alter erosion-sedimentation cycles along valleys, as well as short and long term geomorphological evolution. Concerning the low latitude semi-arid region in South America, fluvial responses to environmental changes during the Upper Holocene have still not been adequately assessed, contrasting with evaluations in river drylands located in middle latitudes. To collaborate with assessments on Upper Holocene climatic fluctuations, alluvial deposits at the Itapicuru River, located in the Brazilian semi-arid, were analyzed to understand this river's dynamics in the last 5 ka and its relationship with both intrinsic and extrinsic factors. The following analyses were performed: [1] spatial terrace distribution throughout the river's longitudinal profile, [2] stratigraphic section assessments, [3] OSL dating, to estimate surface time elaboration, and [4] age correlations with regional paleoclimatic models. In the last 2.2 ka, downcutting and lateral migration occurred at the same time due to fluvial discharge changes over centuries and decades. Semi-arid conditions, such as those currently observed, prevailed throughout the drainage basin, with wet intervals identified upstream. Humidity variations were responsible for middle valley incision and deposition, forming terrace, bars, and natural levees. These findings indicate that, at least in our case study, intrinsic factors had big importance to control the fluvial dynamics since the establishment of the semi-arid low latitude climatic conditions.
publishDate 2021
dc.date.none.fl_str_mv 2021-12-01
2022-04-29T08:32:36Z
2022-04-29T08:32:36Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1016/j.jsames.2021.103545
Journal of South American Earth Sciences, v. 112.
0895-9811
http://hdl.handle.net/11449/229447
10.1016/j.jsames.2021.103545
2-s2.0-85114147773
url http://dx.doi.org/10.1016/j.jsames.2021.103545
http://hdl.handle.net/11449/229447
identifier_str_mv Journal of South American Earth Sciences, v. 112.
0895-9811
10.1016/j.jsames.2021.103545
2-s2.0-85114147773
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Journal of South American Earth Sciences
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
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