Assessment of three dredging plans for a wave-dominated inlet
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://repositorio.lnec.pt:8080/jspui/handle/123456789/1008329 |
Resumo: | Many small wave-dominated inlets are naturally unstable and require regular dredging. To mitigate the costs of these operations, the dredged channels should be designed to bring the inlet close to equilibrium and minimise flood dominance. However, it is often unclear how to optimise the configuration of the channels. This study focuses on a small lagoon on the western Portuguese coast that has been subject to frequent and diverse interventions. A process-based morphodynamic model is applied to compare the dredging plan that has been followed for the last 15 years with two new alternatives. These alternative dredging plans increase the tidal prism and reduce flood dominance, mainly due to the higher channel cross-section. Secondary transverse channels do not affect the morphodynamics significantly. For future dredging operations, it is suggested that the bottom depth of the main natural channel be dredged to chart datum and a secondary channel be added to the previous channel with the same bottom depth and half of the channel width. |
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Assessment of three dredging plans for a wave-dominated inletSediment median grain diameterSignificant wave heightStill-water depth (m)Sand flux along the axis iWave peak periodBed updateDimensionless diffusion coefficientPorosity (dimensionlessMany small wave-dominated inlets are naturally unstable and require regular dredging. To mitigate the costs of these operations, the dredged channels should be designed to bring the inlet close to equilibrium and minimise flood dominance. However, it is often unclear how to optimise the configuration of the channels. This study focuses on a small lagoon on the western Portuguese coast that has been subject to frequent and diverse interventions. A process-based morphodynamic model is applied to compare the dredging plan that has been followed for the last 15 years with two new alternatives. These alternative dredging plans increase the tidal prism and reduce flood dominance, mainly due to the higher channel cross-section. Secondary transverse channels do not affect the morphodynamics significantly. For future dredging operations, it is suggested that the bottom depth of the main natural channel be dredged to chart datum and a secondary channel be added to the previous channel with the same bottom depth and half of the channel width.ICE Publishing2016-07-06T13:52:57Z2017-04-12T15:59:27Z2016-06-01T00:00:00Z2016-06info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfimage/jpegapplication/pdfhttp://repositorio.lnec.pt:8080/jspui/handle/123456789/1008329engMendes, D.Fortunato, A. B.Pires Silva, A.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:RCAAP2024-01-13T03:02:45Zoai:localhost:123456789/1008329Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:38:41.435800Repositório 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 |
Assessment of three dredging plans for a wave-dominated inlet |
title |
Assessment of three dredging plans for a wave-dominated inlet |
spellingShingle |
Assessment of three dredging plans for a wave-dominated inlet Mendes, D. Sediment median grain diameter Significant wave height Still-water depth (m) Sand flux along the axis i Wave peak period Bed update Dimensionless diffusion coefficient Porosity (dimensionless |
title_short |
Assessment of three dredging plans for a wave-dominated inlet |
title_full |
Assessment of three dredging plans for a wave-dominated inlet |
title_fullStr |
Assessment of three dredging plans for a wave-dominated inlet |
title_full_unstemmed |
Assessment of three dredging plans for a wave-dominated inlet |
title_sort |
Assessment of three dredging plans for a wave-dominated inlet |
author |
Mendes, D. |
author_facet |
Mendes, D. Fortunato, A. B. Pires Silva, A. |
author_role |
author |
author2 |
Fortunato, A. B. Pires Silva, A. |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Mendes, D. Fortunato, A. B. Pires Silva, A. |
dc.subject.por.fl_str_mv |
Sediment median grain diameter Significant wave height Still-water depth (m) Sand flux along the axis i Wave peak period Bed update Dimensionless diffusion coefficient Porosity (dimensionless |
topic |
Sediment median grain diameter Significant wave height Still-water depth (m) Sand flux along the axis i Wave peak period Bed update Dimensionless diffusion coefficient Porosity (dimensionless |
description |
Many small wave-dominated inlets are naturally unstable and require regular dredging. To mitigate the costs of these operations, the dredged channels should be designed to bring the inlet close to equilibrium and minimise flood dominance. However, it is often unclear how to optimise the configuration of the channels. This study focuses on a small lagoon on the western Portuguese coast that has been subject to frequent and diverse interventions. A process-based morphodynamic model is applied to compare the dredging plan that has been followed for the last 15 years with two new alternatives. These alternative dredging plans increase the tidal prism and reduce flood dominance, mainly due to the higher channel cross-section. Secondary transverse channels do not affect the morphodynamics significantly. For future dredging operations, it is suggested that the bottom depth of the main natural channel be dredged to chart datum and a secondary channel be added to the previous channel with the same bottom depth and half of the channel width. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-07-06T13:52:57Z 2016-06-01T00:00:00Z 2016-06 2017-04-12T15:59:27Z |
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://repositorio.lnec.pt:8080/jspui/handle/123456789/1008329 |
url |
http://repositorio.lnec.pt:8080/jspui/handle/123456789/1008329 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf image/jpeg application/pdf |
dc.publisher.none.fl_str_mv |
ICE Publishing |
publisher.none.fl_str_mv |
ICE Publishing |
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 instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
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1799136871589085184 |