Erosion and accretion in the Ria de Aveiro inlet (N Portugal) and exportation of fine-grained sediments to the shelf
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10773/13296 |
Resumo: | Harbours are important man made economic structures that are usually constructed in hydrodynamic complex settings. Their life/service cycle, integrity and maintenance are highly dependent on the knowledge of these settings and the capability to predict future changes and thus their economic impact. In this paper, data regarding bottom and suspended sediments of the Aveiro Harbour inlet were gathered and analysed. Measurements of suspended sediment concentrations (SSC) in the Aveiro inlet were taken during eight tidal cycles in 2007, including spring and neap tides throughout winter and summer oceanographic regimes. Results suggest significant temporal variability. Sediments were imported from the ocean sink, mostly near the south jetty and the western side of the Mira Channel, as textural, mineralogical, compositional, geochemical and microfaunal data of bottom sediments suggest. Higher stabilization of the Aveiro Harbour structures is achieved on these accretional areas. The high tidal-current velocities contribute to the erosive character which dominates the central area of the entrance channel, which is located between both breakwaters and close to the north jetty; thus some segments of the north jetty could become damaged through erosion. This is evidenced as much bottom sediments characteristics as patterns of SSC. SSC are in general higher during the winter, due to climatic conditions, current velocities, wind stress and greater availability of sediments provided by the local-river flooding. Our data also suggest that SSC are predominantly higher during ebb and low tide throughout the year, as compared to periods of flood, when a higher flux of sediments is transported seaward than landward. The lagoon exports to the continental shelf mostly muddy sediments, composed essentially of quartz and phyllosilicates. |
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Erosion and accretion in the Ria de Aveiro inlet (N Portugal) and exportation of fine-grained sediments to the shelfMultiproxy approachTidal currentsSuspended and bottom sedimentsRia de AveiroN Portugalenfoque multiproxyCorrientes de mareaSedimentos en suspensión y en el fondoRía de AveiroN de PortugalHarbours are important man made economic structures that are usually constructed in hydrodynamic complex settings. Their life/service cycle, integrity and maintenance are highly dependent on the knowledge of these settings and the capability to predict future changes and thus their economic impact. In this paper, data regarding bottom and suspended sediments of the Aveiro Harbour inlet were gathered and analysed. Measurements of suspended sediment concentrations (SSC) in the Aveiro inlet were taken during eight tidal cycles in 2007, including spring and neap tides throughout winter and summer oceanographic regimes. Results suggest significant temporal variability. Sediments were imported from the ocean sink, mostly near the south jetty and the western side of the Mira Channel, as textural, mineralogical, compositional, geochemical and microfaunal data of bottom sediments suggest. Higher stabilization of the Aveiro Harbour structures is achieved on these accretional areas. The high tidal-current velocities contribute to the erosive character which dominates the central area of the entrance channel, which is located between both breakwaters and close to the north jetty; thus some segments of the north jetty could become damaged through erosion. This is evidenced as much bottom sediments characteristics as patterns of SSC. SSC are in general higher during the winter, due to climatic conditions, current velocities, wind stress and greater availability of sediments provided by the local-river flooding. Our data also suggest that SSC are predominantly higher during ebb and low tide throughout the year, as compared to periods of flood, when a higher flux of sediments is transported seaward than landward. The lagoon exports to the continental shelf mostly muddy sediments, composed essentially of quartz and phyllosilicates.Los puertos son importantes estructuras económicas diseñadas por el hombre, que normalmente son construidas en lugares con una compleja hidrodinámica. Su ciclo de vida de servicio, integridad y mantenimiento dependen del conocimiento de dicha hidrodinámica y de la capacidad para predecir los cambios futuros y por tanto su impacto económico. En este trabajo, los datos sobre los sedimentos que están en el fondo y en suspensión de la entrada del puerto de Aveiro fueron recogidos y analizados. Las mediciones de la concentración de sedimentos en suspensión (SSC) en la entrada de Aveiro se realizaron durante ocho ciclos de las mareas en el año 2007, incluyendo mareas vivas y muertas durante regímenes oceanográficos de invierno y verano. Los resultados sugieren que la variabilidad temporal es significativa. Los sedimentos importados desde el océano se hunden en su mayoría cerca de la escollera sur y en el lado occidental del Canal de Mira, tal y como sugieren los datos texturales, mineralógicos, composicionales, geoquímicos y microfaunales de los sedimentos del fondo. La mayor estabilización de las estructuras del puerto de Aveiro se logra en estas áreas de acreción. La alta velocidad de la corriente de marea contribuye al carácter erosivo, que domina la zona central del canal de entrada, entre los dos espigones y cerca de la escollera norte. Así, algunos segmentos del muelle N podrían resultar dañados por el efecto de la erosión. Esto se pone de manifiesto tanto en las características de los sedimentos del fondo como de los patrones de SSC. Las SSC son en general más altas durante el invierno, debido a las condiciones climáticas, velocidades de la corriente, y a la fuerza del viento y a una mayor disponibilidad de sedimentos aportados por los ríos locales. Nuestros datos también sugieren concentraciones mayores de SSC durante la marea baja (durante todo el año), que durante la marea alta, mostrando que existe un mayor flujo de sedimentos transportado hacia el mar que hacia tierra. La laguna exporta a la plataforma continental sobre todo sedimentos fangosos, compuestos esencialmente por cuarzo y filosilicatos.Universidad Complutense de Madrid2015-01-28T12:11:40Z2011-01-01T00:00:00Z2011info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/13296eng1698-618010.5209/rev_JIGE.2011.v37.n2.9Martins, V.Grangeia, C.Jesus, C. C.Martins, P.Laut, L. M.Sequeira, C.Dias, J. M.Silva, P. A.Abrantes, I.Silva, E. Ferreira daRocha, F.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-17T03:33:24ZPortal AgregadorONG |
dc.title.none.fl_str_mv |
Erosion and accretion in the Ria de Aveiro inlet (N Portugal) and exportation of fine-grained sediments to the shelf |
title |
Erosion and accretion in the Ria de Aveiro inlet (N Portugal) and exportation of fine-grained sediments to the shelf |
spellingShingle |
Erosion and accretion in the Ria de Aveiro inlet (N Portugal) and exportation of fine-grained sediments to the shelf Martins, V. Multiproxy approach Tidal currents Suspended and bottom sediments Ria de Aveiro N Portugal enfoque multiproxy Corrientes de marea Sedimentos en suspensión y en el fondo Ría de Aveiro N de Portugal |
title_short |
Erosion and accretion in the Ria de Aveiro inlet (N Portugal) and exportation of fine-grained sediments to the shelf |
title_full |
Erosion and accretion in the Ria de Aveiro inlet (N Portugal) and exportation of fine-grained sediments to the shelf |
title_fullStr |
Erosion and accretion in the Ria de Aveiro inlet (N Portugal) and exportation of fine-grained sediments to the shelf |
title_full_unstemmed |
Erosion and accretion in the Ria de Aveiro inlet (N Portugal) and exportation of fine-grained sediments to the shelf |
title_sort |
Erosion and accretion in the Ria de Aveiro inlet (N Portugal) and exportation of fine-grained sediments to the shelf |
author |
Martins, V. |
author_facet |
Martins, V. Grangeia, C. Jesus, C. C. Martins, P. Laut, L. M. Sequeira, C. Dias, J. M. Silva, P. A. Abrantes, I. Silva, E. Ferreira da Rocha, F. |
author_role |
author |
author2 |
Grangeia, C. Jesus, C. C. Martins, P. Laut, L. M. Sequeira, C. Dias, J. M. Silva, P. A. Abrantes, I. Silva, E. Ferreira da Rocha, F. |
author2_role |
author author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Martins, V. Grangeia, C. Jesus, C. C. Martins, P. Laut, L. M. Sequeira, C. Dias, J. M. Silva, P. A. Abrantes, I. Silva, E. Ferreira da Rocha, F. |
dc.subject.por.fl_str_mv |
Multiproxy approach Tidal currents Suspended and bottom sediments Ria de Aveiro N Portugal enfoque multiproxy Corrientes de marea Sedimentos en suspensión y en el fondo Ría de Aveiro N de Portugal |
topic |
Multiproxy approach Tidal currents Suspended and bottom sediments Ria de Aveiro N Portugal enfoque multiproxy Corrientes de marea Sedimentos en suspensión y en el fondo Ría de Aveiro N de Portugal |
description |
Harbours are important man made economic structures that are usually constructed in hydrodynamic complex settings. Their life/service cycle, integrity and maintenance are highly dependent on the knowledge of these settings and the capability to predict future changes and thus their economic impact. In this paper, data regarding bottom and suspended sediments of the Aveiro Harbour inlet were gathered and analysed. Measurements of suspended sediment concentrations (SSC) in the Aveiro inlet were taken during eight tidal cycles in 2007, including spring and neap tides throughout winter and summer oceanographic regimes. Results suggest significant temporal variability. Sediments were imported from the ocean sink, mostly near the south jetty and the western side of the Mira Channel, as textural, mineralogical, compositional, geochemical and microfaunal data of bottom sediments suggest. Higher stabilization of the Aveiro Harbour structures is achieved on these accretional areas. The high tidal-current velocities contribute to the erosive character which dominates the central area of the entrance channel, which is located between both breakwaters and close to the north jetty; thus some segments of the north jetty could become damaged through erosion. This is evidenced as much bottom sediments characteristics as patterns of SSC. SSC are in general higher during the winter, due to climatic conditions, current velocities, wind stress and greater availability of sediments provided by the local-river flooding. Our data also suggest that SSC are predominantly higher during ebb and low tide throughout the year, as compared to periods of flood, when a higher flux of sediments is transported seaward than landward. The lagoon exports to the continental shelf mostly muddy sediments, composed essentially of quartz and phyllosilicates. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011-01-01T00:00:00Z 2011 2015-01-28T12:11:40Z |
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://hdl.handle.net/10773/13296 |
url |
http://hdl.handle.net/10773/13296 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
1698-6180 10.5209/rev_JIGE.2011.v37.n2.9 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidad Complutense de Madrid |
publisher.none.fl_str_mv |
Universidad Complutense de Madrid |
dc.source.none.fl_str_mv |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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