Provenance, transport and composition of Dendê Coast beach sands in Bahia, central coast of Brazil

Detalhes bibliográficos
Autor(a) principal: Rebouças, Renata Cardia
Data de Publicação: 2011
Outros Autores: Dominguez, José Maria Landim, Bittencourt, Abilio Carlos da Silva Pinto
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/7020
Resumo: p.339-347
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spelling Rebouças, Renata CardiaDominguez, José Maria LandimBittencourt, Abilio Carlos da Silva PintoRebouças, Renata CardiaDominguez, José Maria LandimBittencourt, Abilio Carlos da Silva Pinto2012-10-22T19:23:12Z2012-10-22T19:23:12Z2011-101982-436Xhttp://www.repositorio.ufba.br/ri/handle/ri/7020v. 59, n. 4p.339-347The great physiographic diversity of the Dendê Coast favors the production of different beach sediment types, including bioclastic components. In this study 74 beach samples collected at 2 km intervals were used to evaluate beach sediment composition. For each sample, 300 grains were identified for each grain size class coarser than 0.125 mm, using a binocular microscope. The beach sediments of the Dendê Coast are essentially siliciclastic (80-100%). Quartz is the major component (70-100%). Only at the Tinharé and Boipeba islands bioclasts are major components of beach sands reaching up to 80-100%. These sediments are made up essentially of fragments of Halimeda, reaching percentages up to 70%. Coralline algae and mollusks also contribute significantly to these sediments (up to 30%). The results obtained show that the spatial distribution of the bioclastic components provide important information on the environmental conditions present at the shoreline (energy levels, availability of hard substrates and protected areas, pattern of sediment dispersion) and on the sediment sources as well. The composition of the beach sediments on the Dendê Coast reflects the present day environmental conditions and show that these sediments do not experience significant lateral transport. This situation is favored by an impeded longshore transport that characterizes most of the region. Although, in general, the rivers that discharge on the Dendê Coast appear to transport few sediments to the coastal zone, the presence of heavy minerals, micas and feldspars suggests river contributions to the beach sediments. On the other hand, the coral and coralline algae reefs, besides offering a natural protection to the shoreline, also represent an important source of beach sands.Submitted by Texeira Ana (atanateixeira@gmail.com) on 2012-10-22T19:23:12Z No. of bitstreams: 1 Rebouças, Renata Cardia.pdf: 1146286 bytes, checksum: a0c6b9a72b8e2a196be2e913ff678370 (MD5)Made available in DSpace on 2012-10-22T19:23:12Z (GMT). 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dc.title.pt_BR.fl_str_mv Provenance, transport and composition of Dendê Coast beach sands in Bahia, central coast of Brazil
dc.title.alternative.pt_BR.fl_str_mv Brazilian Journal of Oceanography
title Provenance, transport and composition of Dendê Coast beach sands in Bahia, central coast of Brazil
spellingShingle Provenance, transport and composition of Dendê Coast beach sands in Bahia, central coast of Brazil
Rebouças, Renata Cardia
Sediment composition
Longshore drift
Provenance
Bioclastics
Beach sands
Central coast of Brazil
title_short Provenance, transport and composition of Dendê Coast beach sands in Bahia, central coast of Brazil
title_full Provenance, transport and composition of Dendê Coast beach sands in Bahia, central coast of Brazil
title_fullStr Provenance, transport and composition of Dendê Coast beach sands in Bahia, central coast of Brazil
title_full_unstemmed Provenance, transport and composition of Dendê Coast beach sands in Bahia, central coast of Brazil
title_sort Provenance, transport and composition of Dendê Coast beach sands in Bahia, central coast of Brazil
author Rebouças, Renata Cardia
author_facet Rebouças, Renata Cardia
Dominguez, José Maria Landim
Bittencourt, Abilio Carlos da Silva Pinto
author_role author
author2 Dominguez, José Maria Landim
Bittencourt, Abilio Carlos da Silva Pinto
author2_role author
author
dc.contributor.author.fl_str_mv Rebouças, Renata Cardia
Dominguez, José Maria Landim
Bittencourt, Abilio Carlos da Silva Pinto
Rebouças, Renata Cardia
Dominguez, José Maria Landim
Bittencourt, Abilio Carlos da Silva Pinto
dc.subject.por.fl_str_mv Sediment composition
Longshore drift
Provenance
Bioclastics
Beach sands
Central coast of Brazil
topic Sediment composition
Longshore drift
Provenance
Bioclastics
Beach sands
Central coast of Brazil
description p.339-347
publishDate 2011
dc.date.issued.fl_str_mv 2011-10
dc.date.accessioned.fl_str_mv 2012-10-22T19:23:12Z
dc.date.available.fl_str_mv 2012-10-22T19:23:12Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.repositorio.ufba.br/ri/handle/ri/7020
dc.identifier.issn.none.fl_str_mv 1982-436X
dc.identifier.number.pt_BR.fl_str_mv v. 59, n. 4
identifier_str_mv 1982-436X
v. 59, n. 4
url http://www.repositorio.ufba.br/ri/handle/ri/7020
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.publisher.none.fl_str_mv Instituto Oceanográfico da Universidade de São Paulo
publisher.none.fl_str_mv Instituto Oceanográfico da Universidade de São Paulo
dc.source.pt_BR.fl_str_mv http://dx.doi.org/10.1590/S1679-87592011000400004
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