Nearshore circulation revealed by wastewater discharge from a submarine outfall, Aveiro Coast, Portugal

Detalhes bibliográficos
Autor(a) principal: Silva, J. F.
Data de Publicação: 2002
Outros Autores: Duck, R. W., Hopkins, T. S., Anderson, J. M.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/13162
Resumo: The morphological and climatic conditions of the Atlantic coast of northern Portugal result in a prevailing upwelling circulation over the continental shelf. A submarine outfall releases wastewater into the ocean c. 3 km directly offshore (at ~16 m water depth) from S. Jacinto, 5 km to the north of the inlet to the estuarine coastal lagoon system of the Ria de Aveiro. The buoyant plume has a distinctive reddish brown colour and is clearly visible at the water surface. The transport and dispersion of the plume was monitored by airborne photography and by in situ water sampling. Results revealed the surface currents present and water mass fronts in the nearshore zone of the Aveiro coast. During the spring and summer, the plume was not transported offshore in the manner expected by the upwelling shelf circulation. Instead, it was commonly observed to be transported alongshore with the prevailing southerly circulation or with an onshore component. The transport to the south caused the outfall plume to interact with the circulation associated with the tidal currents generated in the inlet channel to the Ria de Aveiro. The observations suggest that the trophic status of the Ria de Aveiro is unlikely to change because of the operation of the submarine outfall. Furthermore, this study demonstrates how simple observations of wastewater discharge from a submarine outfall can be used to improve understanding of nearshore circulation.
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spelling Nearshore circulation revealed by wastewater discharge from a submarine outfall, Aveiro Coast, PortugalWater circulationUpwellingOcean outfallRemote sensingEutrophicationRia de AveiroThe morphological and climatic conditions of the Atlantic coast of northern Portugal result in a prevailing upwelling circulation over the continental shelf. A submarine outfall releases wastewater into the ocean c. 3 km directly offshore (at ~16 m water depth) from S. Jacinto, 5 km to the north of the inlet to the estuarine coastal lagoon system of the Ria de Aveiro. The buoyant plume has a distinctive reddish brown colour and is clearly visible at the water surface. The transport and dispersion of the plume was monitored by airborne photography and by in situ water sampling. Results revealed the surface currents present and water mass fronts in the nearshore zone of the Aveiro coast. During the spring and summer, the plume was not transported offshore in the manner expected by the upwelling shelf circulation. Instead, it was commonly observed to be transported alongshore with the prevailing southerly circulation or with an onshore component. The transport to the south caused the outfall plume to interact with the circulation associated with the tidal currents generated in the inlet channel to the Ria de Aveiro. The observations suggest that the trophic status of the Ria de Aveiro is unlikely to change because of the operation of the submarine outfall. Furthermore, this study demonstrates how simple observations of wastewater discharge from a submarine outfall can be used to improve understanding of nearshore circulation.European Geosciences Union2015-01-19T10:54:21Z2002-01-01T00:00:00Z2002info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/13162eng1027-560610.5194/hess-6-983-2002Silva, J. F.Duck, R. W.Hopkins, T. S.Anderson, J. M.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:RCAAP2024-02-22T11:19:17Zoai:ria.ua.pt:10773/13162Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:47:23.605683Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Nearshore circulation revealed by wastewater discharge from a submarine outfall, Aveiro Coast, Portugal
title Nearshore circulation revealed by wastewater discharge from a submarine outfall, Aveiro Coast, Portugal
spellingShingle Nearshore circulation revealed by wastewater discharge from a submarine outfall, Aveiro Coast, Portugal
Silva, J. F.
Water circulation
Upwelling
Ocean outfall
Remote sensing
Eutrophication
Ria de Aveiro
title_short Nearshore circulation revealed by wastewater discharge from a submarine outfall, Aveiro Coast, Portugal
title_full Nearshore circulation revealed by wastewater discharge from a submarine outfall, Aveiro Coast, Portugal
title_fullStr Nearshore circulation revealed by wastewater discharge from a submarine outfall, Aveiro Coast, Portugal
title_full_unstemmed Nearshore circulation revealed by wastewater discharge from a submarine outfall, Aveiro Coast, Portugal
title_sort Nearshore circulation revealed by wastewater discharge from a submarine outfall, Aveiro Coast, Portugal
author Silva, J. F.
author_facet Silva, J. F.
Duck, R. W.
Hopkins, T. S.
Anderson, J. M.
author_role author
author2 Duck, R. W.
Hopkins, T. S.
Anderson, J. M.
author2_role author
author
author
dc.contributor.author.fl_str_mv Silva, J. F.
Duck, R. W.
Hopkins, T. S.
Anderson, J. M.
dc.subject.por.fl_str_mv Water circulation
Upwelling
Ocean outfall
Remote sensing
Eutrophication
Ria de Aveiro
topic Water circulation
Upwelling
Ocean outfall
Remote sensing
Eutrophication
Ria de Aveiro
description The morphological and climatic conditions of the Atlantic coast of northern Portugal result in a prevailing upwelling circulation over the continental shelf. A submarine outfall releases wastewater into the ocean c. 3 km directly offshore (at ~16 m water depth) from S. Jacinto, 5 km to the north of the inlet to the estuarine coastal lagoon system of the Ria de Aveiro. The buoyant plume has a distinctive reddish brown colour and is clearly visible at the water surface. The transport and dispersion of the plume was monitored by airborne photography and by in situ water sampling. Results revealed the surface currents present and water mass fronts in the nearshore zone of the Aveiro coast. During the spring and summer, the plume was not transported offshore in the manner expected by the upwelling shelf circulation. Instead, it was commonly observed to be transported alongshore with the prevailing southerly circulation or with an onshore component. The transport to the south caused the outfall plume to interact with the circulation associated with the tidal currents generated in the inlet channel to the Ria de Aveiro. The observations suggest that the trophic status of the Ria de Aveiro is unlikely to change because of the operation of the submarine outfall. Furthermore, this study demonstrates how simple observations of wastewater discharge from a submarine outfall can be used to improve understanding of nearshore circulation.
publishDate 2002
dc.date.none.fl_str_mv 2002-01-01T00:00:00Z
2002
2015-01-19T10:54:21Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
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status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10773/13162
url http://hdl.handle.net/10773/13162
dc.language.iso.fl_str_mv eng
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10.5194/hess-6-983-2002
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publisher.none.fl_str_mv European Geosciences Union
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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