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

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dc.contributor.authorLima, Kleber Carvalho
dc.contributor.authorPerez Filho, Archimedes
dc.contributor.authorLupinacci, Cenira Maria [UNESP]
dc.contributor.authorValézio, Éverton Vinicius
dc.contributor.authorGóes, Liliane Matos
dc.contributor.institutionUniversity of Pernambuco (UPE)
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniversity of Bahia State (UNEB)
dc.date.accessioned2022-04-29T08:32:36Z
dc.date.available2022-04-29T08:32:36Z
dc.date.issued2021-12-01
dc.description.abstractRiver 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.en
dc.description.affiliationDepartment of Geography Campus Garanhuns University of Pernambuco (UPE)
dc.description.affiliationDepartment of Geography Institute of Geoscience State University of Campinas (UNICAMP)
dc.description.affiliationDepartment of Geography and Environmental Planning Campus Rio Claro São Paulo State University “Júlio de Mesquita Filho” (UNESP)
dc.description.affiliationDepartment of Geography Institute of Geoscience University of Campinas (UNICAMP)
dc.description.affiliationDepartment of Humanities Campus Jacobina University of Bahia State (UNEB)
dc.description.affiliationUnespDepartment of Geography and Environmental Planning Campus Rio Claro São Paulo State University “Júlio de Mesquita Filho” (UNESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdCAPES: 001
dc.description.sponsorshipIdFAPESP: 2012/00145–6
dc.description.sponsorshipIdFAPESP: 408333/2013–8
dc.identifierhttp://dx.doi.org/10.1016/j.jsames.2021.103545
dc.identifier.citationJournal of South American Earth Sciences, v. 112.
dc.identifier.doi10.1016/j.jsames.2021.103545
dc.identifier.issn0895-9811
dc.identifier.scopus2-s2.0-85114147773
dc.identifier.urihttp://hdl.handle.net/11449/229447
dc.language.isoeng
dc.relation.ispartofJournal of South American Earth Sciences
dc.sourceScopus
dc.subjectAllogenic rivers
dc.subjectDrylands
dc.subjectItapicuru River
dc.subjectOSL Dating
dc.subjectTropical zones
dc.titleFluvial responses to external and internal forcing: Upper Holocene dynamics in a low latitude semi-arid region in South Americaen
dc.typeArtigo
unesp.author.orcid0000-0002-9468-2473[1]
unesp.author.orcid0000-0001-6675-3740[2]

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