Sand bypass and updrift beach evolution after jetty construction at an ebb-tidal delta

Detalhes bibliográficos
Autor(a) principal: Garel, Erwan
Data de Publicação: 2015
Outros Autores: Mendes da Silva de Sousa, Carlos A, Ferreira, Óscar
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.1/10902
Resumo: The evolution of an ebb-tidal delta (Guadiana, South Portugal) and its updrift beach after jetty construction (in 1972e1974) is analysed based on 24 ortho-rectified aerial photographs (1940e2012) and 13 bathymetric maps (1969e2014). The objectives are to evaluate the re-establishment of the sand bypassing process and if the disruption of the historical delta may affect the updrift beach evolution. Post-jetty progradation of the updrift beach resulted from two large accretion events. The second (largest) event (110 m progradation in 1985e1994) was due to beach attachment of a shoal produced by the erosion of a broad shallow area relict of the historical delta. The reworking of sand from this relict area also enables the individualisation of a lateral updrift bar simultaneously with the new ebb shoal proper formation. Both morphological features were close to (volume) equilibrium in 1995, indicating that most of the sand was transported towards the downdrift side of the inlet at that time. This study shows that erosion of the historical delta may enhance significantly the updrift shoreline progradation and may promote the re-establishment of sand bypassing after jetty construction.
id RCAP_838db7121714076e4a52ec58e5fa6838
oai_identifier_str oai:sapientia.ualg.pt:10400.1/10902
network_acronym_str RCAP
network_name_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository_id_str 7160
spelling Sand bypass and updrift beach evolution after jetty construction at an ebb-tidal deltaMixed-energy tidal inletGuadianaEbb shoalLateral barMorphologyShoal attachmentThe evolution of an ebb-tidal delta (Guadiana, South Portugal) and its updrift beach after jetty construction (in 1972e1974) is analysed based on 24 ortho-rectified aerial photographs (1940e2012) and 13 bathymetric maps (1969e2014). The objectives are to evaluate the re-establishment of the sand bypassing process and if the disruption of the historical delta may affect the updrift beach evolution. Post-jetty progradation of the updrift beach resulted from two large accretion events. The second (largest) event (110 m progradation in 1985e1994) was due to beach attachment of a shoal produced by the erosion of a broad shallow area relict of the historical delta. The reworking of sand from this relict area also enables the individualisation of a lateral updrift bar simultaneously with the new ebb shoal proper formation. Both morphological features were close to (volume) equilibrium in 1995, indicating that most of the sand was transported towards the downdrift side of the inlet at that time. This study shows that erosion of the historical delta may enhance significantly the updrift shoreline progradation and may promote the re-establishment of sand bypassing after jetty construction.The following institutions in Portugal are acknowledged for providing some of the bathymetric maps used in this study: Ministry of Public Works, Transport and Communications (MOPTC); Hydrographic Institute (IH); and, Port and Maritime Transport Institute (IPTM).ElsevierSapientiaGarel, ErwanMendes da Silva de Sousa, Carlos AFerreira, Óscar2018-11-02T18:30:20Z20152015-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.1/10902eng0272-7714AUT: OFE00989;https://doi.org/10.1016/j.ecss.2015.05.044info: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:RCAAP2023-07-24T10:22:36Zoai:sapientia.ualg.pt:10400.1/10902Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:02:28.436864Repositório 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 Sand bypass and updrift beach evolution after jetty construction at an ebb-tidal delta
title Sand bypass and updrift beach evolution after jetty construction at an ebb-tidal delta
spellingShingle Sand bypass and updrift beach evolution after jetty construction at an ebb-tidal delta
Garel, Erwan
Mixed-energy tidal inlet
Guadiana
Ebb shoal
Lateral bar
Morphology
Shoal attachment
title_short Sand bypass and updrift beach evolution after jetty construction at an ebb-tidal delta
title_full Sand bypass and updrift beach evolution after jetty construction at an ebb-tidal delta
title_fullStr Sand bypass and updrift beach evolution after jetty construction at an ebb-tidal delta
title_full_unstemmed Sand bypass and updrift beach evolution after jetty construction at an ebb-tidal delta
title_sort Sand bypass and updrift beach evolution after jetty construction at an ebb-tidal delta
author Garel, Erwan
author_facet Garel, Erwan
Mendes da Silva de Sousa, Carlos A
Ferreira, Óscar
author_role author
author2 Mendes da Silva de Sousa, Carlos A
Ferreira, Óscar
author2_role author
author
dc.contributor.none.fl_str_mv Sapientia
dc.contributor.author.fl_str_mv Garel, Erwan
Mendes da Silva de Sousa, Carlos A
Ferreira, Óscar
dc.subject.por.fl_str_mv Mixed-energy tidal inlet
Guadiana
Ebb shoal
Lateral bar
Morphology
Shoal attachment
topic Mixed-energy tidal inlet
Guadiana
Ebb shoal
Lateral bar
Morphology
Shoal attachment
description The evolution of an ebb-tidal delta (Guadiana, South Portugal) and its updrift beach after jetty construction (in 1972e1974) is analysed based on 24 ortho-rectified aerial photographs (1940e2012) and 13 bathymetric maps (1969e2014). The objectives are to evaluate the re-establishment of the sand bypassing process and if the disruption of the historical delta may affect the updrift beach evolution. Post-jetty progradation of the updrift beach resulted from two large accretion events. The second (largest) event (110 m progradation in 1985e1994) was due to beach attachment of a shoal produced by the erosion of a broad shallow area relict of the historical delta. The reworking of sand from this relict area also enables the individualisation of a lateral updrift bar simultaneously with the new ebb shoal proper formation. Both morphological features were close to (volume) equilibrium in 1995, indicating that most of the sand was transported towards the downdrift side of the inlet at that time. This study shows that erosion of the historical delta may enhance significantly the updrift shoreline progradation and may promote the re-establishment of sand bypassing after jetty construction.
publishDate 2015
dc.date.none.fl_str_mv 2015
2015-01-01T00:00:00Z
2018-11-02T18:30:20Z
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/10400.1/10902
url http://hdl.handle.net/10400.1/10902
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 0272-7714
AUT: OFE00989;
https://doi.org/10.1016/j.ecss.2015.05.044
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 Elsevier
publisher.none.fl_str_mv Elsevier
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
_version_ 1799133258552705024

Registros relacionados