Rotation, sedimentary deficit and erosion of a trailing spit inside ria of Arousa (NW Spain)

Based on the analysis of a large set of remote images, bathymetric studies and acoustic profiles, we studied the causes of erosion of a small island inside a ria of the NW coast of Spain. The island consists of a rocky sector to the south and a trailing, or comet-tail, spit to the north, which, until...

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Detalles Bibliográficos
Autores: Blanco Chao, Ramón, Cajade Pascual, Daniel, Costa Casais, Manuela
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Universidad de Santiago de Compostela (USC)
Repositorio:Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela
Idioma:inglés
OAI Identifier:oai:minerva.usc.gal:10347/45233
Acceso en línea:https://hdl.handle.net/10347/45233
Access Level:acceso abierto
Palabra clave:Spit
Erosion
Waves
Coastal dynamics
Mussel farming
Remote images
NW Spain
54 Geografía
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spelling Rotation, sedimentary deficit and erosion of a trailing spit inside ria of Arousa (NW Spain)Blanco Chao, RamónCajade Pascual, DanielCosta Casais, ManuelaSpitErosionWavesCoastal dynamicsMussel farmingRemote imagesNW Spain54 GeografíaBased on the analysis of a large set of remote images, bathymetric studies and acoustic profiles, we studied the causes of erosion of a small island inside a ria of the NW coast of Spain. The island consists of a rocky sector to the south and a trailing, or comet-tail, spit to the north, which, until 1980, was in an equilibrium between the waves of the open ocean propagated inside the ria and the local wind waves. The development, in the 1970s, of a large park of floating rafts for mussel farming was identified as the factor triggering a period of disequilibrium and severe erosion on the island. The area covered by the floating rafts was the cause of the attenuation of local wind waves and the reinforcement of waves propagated from the open ocean. The spit underwent a period of approximately 38 years of disequilibrium characterized by a rotation movement with several phases. During the first period (1980–1989), a submarine lobe was formed, sequestering approximately 9000 m3 of sediment. Between 1989 and 2015, the spit maintained a rotation of 24° of amplitude and a phase of severe erosion, with rates of up to 6.6 m/yr, began in 2000. Since 2015, the spit has entered a new phase of stabilization, reducing the rotation to a small amplitude of 5°. The rates of erosion have also decreased, although they are still active.ElsevierUniversidade de Santiago de Compostela. Departamento de Xeografía20202020-08-0220202020-08-02journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/10347/45233reponame:Minerva. Repositorio Institucional de la Universidad de Santiago de Compostelainstname:Universidad de Santiago de Compostela (USC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:minerva.usc.gal:10347/452332026-06-15T12:47:27Z
dc.title.none.fl_str_mv Rotation, sedimentary deficit and erosion of a trailing spit inside ria of Arousa (NW Spain)
title Rotation, sedimentary deficit and erosion of a trailing spit inside ria of Arousa (NW Spain)
spellingShingle Rotation, sedimentary deficit and erosion of a trailing spit inside ria of Arousa (NW Spain)
Blanco Chao, Ramón
Spit
Erosion
Waves
Coastal dynamics
Mussel farming
Remote images
NW Spain
54 Geografía
title_short Rotation, sedimentary deficit and erosion of a trailing spit inside ria of Arousa (NW Spain)
title_full Rotation, sedimentary deficit and erosion of a trailing spit inside ria of Arousa (NW Spain)
title_fullStr Rotation, sedimentary deficit and erosion of a trailing spit inside ria of Arousa (NW Spain)
title_full_unstemmed Rotation, sedimentary deficit and erosion of a trailing spit inside ria of Arousa (NW Spain)
title_sort Rotation, sedimentary deficit and erosion of a trailing spit inside ria of Arousa (NW Spain)
dc.creator.none.fl_str_mv Blanco Chao, Ramón
Cajade Pascual, Daniel
Costa Casais, Manuela
author Blanco Chao, Ramón
author_facet Blanco Chao, Ramón
Cajade Pascual, Daniel
Costa Casais, Manuela
author_role author
author2 Cajade Pascual, Daniel
Costa Casais, Manuela
author2_role author
author
dc.contributor.none.fl_str_mv Universidade de Santiago de Compostela. Departamento de Xeografía
dc.subject.none.fl_str_mv Spit
Erosion
Waves
Coastal dynamics
Mussel farming
Remote images
NW Spain
54 Geografía
topic Spit
Erosion
Waves
Coastal dynamics
Mussel farming
Remote images
NW Spain
54 Geografía
description Based on the analysis of a large set of remote images, bathymetric studies and acoustic profiles, we studied the causes of erosion of a small island inside a ria of the NW coast of Spain. The island consists of a rocky sector to the south and a trailing, or comet-tail, spit to the north, which, until 1980, was in an equilibrium between the waves of the open ocean propagated inside the ria and the local wind waves. The development, in the 1970s, of a large park of floating rafts for mussel farming was identified as the factor triggering a period of disequilibrium and severe erosion on the island. The area covered by the floating rafts was the cause of the attenuation of local wind waves and the reinforcement of waves propagated from the open ocean. The spit underwent a period of approximately 38 years of disequilibrium characterized by a rotation movement with several phases. During the first period (1980–1989), a submarine lobe was formed, sequestering approximately 9000 m3 of sediment. Between 1989 and 2015, the spit maintained a rotation of 24° of amplitude and a phase of severe erosion, with rates of up to 6.6 m/yr, began in 2000. Since 2015, the spit has entered a new phase of stabilization, reducing the rotation to a small amplitude of 5°. The rates of erosion have also decreased, although they are still active.
publishDate 2020
dc.date.none.fl_str_mv 2020
2020-08-02
2020
2020-08-02
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/10347/45233
url https://hdl.handle.net/10347/45233
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
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:Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela
instname:Universidad de Santiago de Compostela (USC)
instname_str Universidad de Santiago de Compostela (USC)
reponame_str Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela
collection Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela
repository.name.fl_str_mv
repository.mail.fl_str_mv
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