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dc.contributor.author Isla, Federico Ignacio
dc.contributor.author Cortizo, Luis
dc.date.available 2018-01-31T19:44:03Z
dc.date.issued 2014-10
dc.identifier.citation Isla, Federico Ignacio; Cortizo, Luis; Sediment input from fluvial sources and cliff erosion to the continental shelf of Argentina; Portuguese association of water resources; Journal of Integrated Coastal zone Management; 14; 4; 10-2014; 541-552
dc.identifier.issn 1646-8872
dc.identifier.uri http://hdl.handle.net/11336/35290
dc.description.abstract The coasts of southern Buenos Aires, Patagonia and Tierra del Fuego are dominated by cliff erosion. Mean rates of cliff retreat are estimated to be about 0.5-0.6 m/year by comparing old photographs with modern satellite images. Considering the height of the Patagonian and Fueguian cliffs (70 to 120 m), the volume of sediment eroded from these cliffs exceeded the volumes provided by the erosion of the cliffs of Buenos Aires (10 to 20 m height). These erosion rates support an estimated delivery of 217 million tons of sediment per year to the continental shelf, exceeding significantly the 22 millions of tons/year transported by the larger Patagonian rivers Negro and Colorado. However, the contribution of these rivers has decreased since the Late Pleistocene changes in the direction of transport of some watersheds. The Chubut and Chico de Santa Cruz rivers suffered reductions of 21-24% in their watershed areas, resulting in reductions of about 33-34% in the volume of water transported to the Atlantic Ocean per year. As the amount of sediment delivered to the Argentine continental shelf by cliff erosion is higher than the fluvial transport, it should be also considered in the balance of beaches fed by longshore transport.
dc.description.abstract O litoral de Buenos Aires, Patagónia e Terra del Fuego é dominado pela erosão de falésias marinhas. As taxas de medias de recuo foram estimados em 0,5-0,6 m/ano, com base na comparação de fotografias aéreas antigas com imagens satelitárias modernas. Considerando a altura das falésias patagónicas e fueguinas (70 a 120 m), o volume de sedimento erodido supera os volumes que provêm das falésias de Buenos Aires (10 a 20 m). Estas taxas de erosão permitiram estimar um aporte de 217 milhões de toneladas por ano de sedimento à plataforma continental, superando os 22 milhões de toneladas/ano transportados pelos rios da Patagónia, Negro e Colorado. Além disso, a contribuição fluvial diminuiu devido às alterações na drenagem que afetaram algumas bacias desde o Pleistoceno Superior. Os rios Chubut e Chico de Santa Cruz sofreram reduções de 21-24% nas áreas de drenagem, o que significou diminuções de 33-44% nas contribuições de água para o Oceano Atlântico. Como o volume de sedimentos proveniente da erosão de falésias e fornecido à plataforma continental argentina supera o do fornecimento fluvial, tal deve ser também considerado na análise do balanço sedimentar das praias alimentadas pela deriva litorânea.
dc.format application/pdf
dc.language.iso eng
dc.publisher Portuguese association of water resources
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject cliff erosion
dc.subject sediment supply
dc.subject drainage reversals
dc.subject Patagonia
dc.subject Buenos Aires
dc.subject.classification Meteorología y Ciencias Atmosféricas
dc.subject.classification Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title Sediment input from fluvial sources and cliff erosion to the continental shelf of Argentina
dc.title Fornecimento sedimentar de origem fluvial e da erosão costeira à plataforma continental Argentina
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2018-01-26T18:56:30Z
dc.journal.volume 14
dc.journal.number 4
dc.journal.pagination 541-552
dc.journal.pais Portugal
dc.journal.ciudad Lisboa
dc.description.fil Fil: Isla, Federico Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Geología de Costas y del Cuaternario. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Geología de Costas y del Cuaternario; Argentina
dc.description.fil Fil: Cortizo, Luis. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas; Argentina
dc.journal.title Journal of Integrated Coastal zone Management
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.5894/rgci436
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/http://www.aprh.pt/rgci/rgci436.html
dc.conicet.fuente individual


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    Articulos de INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS

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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)