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Some evidences of northward fine sediment transport in the northern portuguese continental shelf

Drago, Teresa ; Oliveira, Anabela ; Magalhães, Fernando ; Cascalho, João ; Jouanneau, Jean-Marie ; Vitorino, João

Oceanologica acta, 1998, Vol.21 (2), p.223-231 [Periódico revisado por pares]

Paris: Elsevier SAS

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  • Título:
    Some evidences of northward fine sediment transport in the northern portuguese continental shelf
  • Autor: Drago, Teresa ; Oliveira, Anabela ; Magalhães, Fernando ; Cascalho, João ; Jouanneau, Jean-Marie ; Vitorino, João
  • Assuntos: biotite ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; fine sediments ; hydrologie hivernale ; Marine ; Marine and continental quaternary ; plateau continental portugais ; Portuguese shelf ; sediment transport ; Surficial geology ; sédiment fin ; transport de sédiments ; winter regime
  • É parte de: Oceanologica acta, 1998, Vol.21 (2), p.223-231
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
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    ObjectType-Article-2
    ObjectType-Conference-1
    ObjectType-Feature-3
  • Descrição: On the basis of sedimentological and oceanographical data, a transport scheme for fine-grained material is proposed in order to explain the location of a muddy deposit present in the northern Portuguese continental shelf, north-west off the Douro River mouth. This mid-shelf deposit is recent, active and its main source is apparently the Douro River. The sediment supply can be related with the oceanographic conditions in winter regime, characterised by a poleward along-shelf current with a bottom westward component, as a consequence of a south-west wind. The resulting fine sediment transport, essentially made in the bottom nepheloid layer, is believed to have a north-west direction. Un schéma de circulation des sédiments fins, sur le plateau continental au nord du Portugal, a été établi à partir de données sédimentologiques et océanographiques. Il explique la présence d'une vasière située au nord-ouest de l'embouchure du Douro; ce dépôt récent et actif proviendrait essentiellement du fleuve. L'apport de sédiment est lié aux conditions hydrologiques hivernales, caractérisées par un courant dirigé vers le nord le long du plateau continental avec, au fond, une composante vers l'ouest due au vent du sud-ouest. Il en résulte que le transport des sédiments fins se fait principalement dans la couche néphéloïde de fond, en direction du nord-ouest.
  • Editor: Paris: Elsevier SAS
  • Idioma: Inglês;Francês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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