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dc.contributor.authorIrion, George F.-
dc.contributor.authorMüller, Jens-
dc.contributor.authorMorais, Jáder Onofre de-
dc.contributor.authorKeim, Gertrud-
dc.contributor.authorMello, Jose Nunes de-
dc.contributor.authorJunk, Wolfgang Johannes-
dc.date.accessioned2020-06-15T22:01:58Z-
dc.date.available2020-06-15T22:01:58Z-
dc.date.issued2009-
dc.identifier.urihttps://repositorio.inpa.gov.br/handle/1/18495-
dc.description.abstractCoring and acoustic surveying (3.5 kHz) in both rivers and lakes in Central Amazonia provide additional insights into the Late Quaternary hydrological and sedimentological development of the Amazon River and its tributaries. Erosion and accumulation phases were found to be linked to Quaternary sea level changes. The low sea level phase during the last glacial maximum caused deep incision of the Amazon River and erosion in major tributaries such as the Rio Negro, 1500 km upstream from the Amazon mouth. A 3.5-kHz profiling suggests a lowering of the water level by at least 30 m at Manaus. During that phase, the slope of the Amazon valley must have increased, resulting in an increase in bed load transport capacity. The subsequent sea level rise caused a backwater effect far upstream, with silting up of the Amazon valley and the tributary inflows. Former river systems changed into Ria lakes. The floodplains of the Amazon River, the várzea, were formed approximately 5000 years ago when the sea level approached its present-day level. Copyright © 2009 John Wiley & Sons, Ltd.en
dc.language.isoenpt_BR
dc.relation.ispartofVolume 23, Número 22, Pags. 3168-3172pt_BR
dc.rightsRestrito*
dc.subjectErosionen
dc.subjectLakesen
dc.subjectSea Levelen
dc.subjectSediment Transporten
dc.subjectSedimentsen
dc.subjectWater Levelsen
dc.subjectAmazoniaen
dc.subjectBackwater Effectsen
dc.subjectBed-load Transporten
dc.subjectLast Glacial Maximumen
dc.subjectQuaternary (late)en
dc.subjectRivers And Lakesen
dc.subjectSealevel Changeen
dc.subjectRiversen
dc.subjectErosionen
dc.subjectFloodplainen
dc.subjectLandform Evolutionen
dc.subjectLowland Environmenten
dc.subjectQuaternaryen
dc.subjectSealevel Changeen
dc.subjectSediment Transporten
dc.subjectTributaryen
dc.subjectAmazon Riveren
dc.subjectAmazoniaen
dc.subjectSouth Americaen
dc.titleThe impact of Quaternary sea level changes on the evolution of the Amazonian lowlanden
dc.typeArtigopt_BR
dc.identifier.doi10.1002/hyp.7386-
dc.publisher.journalHydrological Processespt_BR
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