Ultra-high resolution seismostratigraphic study of a beach nourishment loan area: Barra-Mira (Northwest Portugal)

Detalhes bibliográficos
Autor(a) principal: Silva, Mariana Antunes Regadas Brandão da
Data de Publicação: 2020
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10451/48424
Resumo: Tese de mestrado, Geologia (Estratigrafia, Sedimentologia e Paleontologia) Universidade de Lisboa, Faculdade de Ciências, 2020
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spelling Ultra-high resolution seismostratigraphic study of a beach nourishment loan area: Barra-Mira (Northwest Portugal)CHIMERABarra-MiraAveiroNW de PortugalSísmica de muito alta resoluçãoTeses de mestrado - 2020Departamento de GeologiaTese de mestrado, Geologia (Estratigrafia, Sedimentologia e Paleontologia) Universidade de Lisboa, Faculdade de Ciências, 2020Nowadays we witness numerous problems associated with climate change, one of which is the intensification of coastal erosion. This is a process which is widely known in the Portuguese coast, being responsible for sediment remobilization specially in the low and sandy littoral. Not only does this contribute to the destruction of ecosystems and impacts liveability of the population in these areas but it also affects the tourism which is so important for the growth of a countries’ economy. To reduce the harmful impacts of coastal erosion, characterization of loan areas assumes a fundamental role for subsequent beach artificial nourishment – the most frequent implemented measure in other European countries to mitigate these effects. These operations use natural resources extracted from a feeder (by dredging) that are deposited on the troublesome coastal segments identified – it ensures protection and adaptation of coastal environments in a more natural way. For a loan area to become a possible source of sediment for beach artificial nourishment it must be in relatively close proximity and present specific characteristics, such as, the grain size (granulometry), mineralogic composition, fine and coarse percentages, carbonate percentage and a reduced contamination degree. Aside from knowing these characteristics locally it is necessary to overview how the different seismostratigraphic units are distributed, their relationship and geometry, quantification of unit’s volumes and for that seismic data is crucial. Once that characterization is complete it is important to make an economic viability study (if they are viable to be extracted and used to mitigate the erosional effects. With this in mind the CHIMERA project was delineated and financed by the Programa Operacional Sustentabilidade e Eficiência no Uso de Recursos (POSEUR-09-2016-48). This was applied to areas that had previously been identified as highly susceptible to coastal erosion: Costa da Caparica (CC), Espinho-Torreira (ET), Barra-Mira (BM) and Figueira da Foz-Leirosa (FFL). This thesis is based on the work developed during the Chimera project, starting with the acquisition of bathymetric, magnetic and single and multichannel seismic data until their interpretation, followed by the processing and interpretation of all the data. It is important to understand if this multidisciplinary methodology allow for a recount of geological history and if they complement each other for results and conclusions. The main motivation was to understand the coastal erosions impacts and how to proceed to mitigate them. In order to present a concrete study, I opted to focus in only one of the study areas – Barra-Mira (BM) as it showed a richer geological story. This work comprises the main steps of acquisition, processing, and interpretation of ultra-high resolution seismic data (UHRS) in more detail. This corroborated with other geophysical techniques (hydrographic and sedimentological data) led to: (a) definition and mapping of seven seismostratigraphic units; (b) volumetric quantification for each sedimentary class; (c) determination of usable sediment (only fraction described as medium to coarse sand) percentage. The total sediment thickness above the rocky substrate can reach to 104.26x106m3 (or 0.1 km3 ) but if we account the fact that for the sediment to be viable for beach nourishment it has to have a carbonate content of < 30%...Terrinha, Pedro, 1959-Brito, Pedro Jorge de Oliveira, 1970-Repositório da Universidade de LisboaSilva, Mariana Antunes Regadas Brandão da2021-06-09T09:37:15Z202020202020-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10451/48424TID:202605868engmetadata only accessinfo: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:RCAAP2023-11-08T16:51:50Zoai:repositorio.ul.pt:10451/48424Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T22:00:19.616553Repositório 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 Ultra-high resolution seismostratigraphic study of a beach nourishment loan area: Barra-Mira (Northwest Portugal)
title Ultra-high resolution seismostratigraphic study of a beach nourishment loan area: Barra-Mira (Northwest Portugal)
spellingShingle Ultra-high resolution seismostratigraphic study of a beach nourishment loan area: Barra-Mira (Northwest Portugal)
Silva, Mariana Antunes Regadas Brandão da
CHIMERA
Barra-Mira
Aveiro
NW de Portugal
Sísmica de muito alta resolução
Teses de mestrado - 2020
Departamento de Geologia
title_short Ultra-high resolution seismostratigraphic study of a beach nourishment loan area: Barra-Mira (Northwest Portugal)
title_full Ultra-high resolution seismostratigraphic study of a beach nourishment loan area: Barra-Mira (Northwest Portugal)
title_fullStr Ultra-high resolution seismostratigraphic study of a beach nourishment loan area: Barra-Mira (Northwest Portugal)
title_full_unstemmed Ultra-high resolution seismostratigraphic study of a beach nourishment loan area: Barra-Mira (Northwest Portugal)
title_sort Ultra-high resolution seismostratigraphic study of a beach nourishment loan area: Barra-Mira (Northwest Portugal)
author Silva, Mariana Antunes Regadas Brandão da
author_facet Silva, Mariana Antunes Regadas Brandão da
author_role author
dc.contributor.none.fl_str_mv Terrinha, Pedro, 1959-
Brito, Pedro Jorge de Oliveira, 1970-
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Silva, Mariana Antunes Regadas Brandão da
dc.subject.por.fl_str_mv CHIMERA
Barra-Mira
Aveiro
NW de Portugal
Sísmica de muito alta resolução
Teses de mestrado - 2020
Departamento de Geologia
topic CHIMERA
Barra-Mira
Aveiro
NW de Portugal
Sísmica de muito alta resolução
Teses de mestrado - 2020
Departamento de Geologia
description Tese de mestrado, Geologia (Estratigrafia, Sedimentologia e Paleontologia) Universidade de Lisboa, Faculdade de Ciências, 2020
publishDate 2020
dc.date.none.fl_str_mv 2020
2020
2020-01-01T00:00:00Z
2021-06-09T09:37:15Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10451/48424
TID:202605868
url http://hdl.handle.net/10451/48424
identifier_str_mv TID:202605868
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv metadata only access
info:eu-repo/semantics/openAccess
rights_invalid_str_mv metadata only access
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
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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