Provenance, transport and composition of Dendê Coast beach sands in Bahia, central coast of Brazil
p.339-347
| Authors: | ; ; |
|---|---|
| Format: | Article |
| Status: | Published version |
| Publication date: | 2011 |
| Country: | Brasil |
| Institution: | UFBA |
| Repository: | Repositório Institucional da UFBA |
| Language: | English |
| OAI Identifier: | oai:repositorio.ufba.br:ri/7020 |
| Online Access: | http://www.repositorio.ufba.br/ri/handle/ri/7020 |
| Access Level: | Open access |
| Keyword: | Sediment composition Longshore drift Provenance Bioclastics Beach sands Central coast of Brazil |
| _version_ | 1878761893130141696 |
|---|---|
| author | Rebouças, Renata Cardia |
| author2 | Dominguez, José Maria Landim Bittencourt, Abilio Carlos da Silva Pinto |
| author2_role | author author |
| author_browse | Bittencourt, Abilio Carlos da Silva Pinto Dominguez, José Maria Landim Rebouças, Renata Cardia |
| author_facet | Rebouças, Renata Cardia Dominguez, José Maria Landim Bittencourt, Abilio Carlos da Silva Pinto |
| author_role | author |
| bitstream_url_str_mv | https://repositorio.ufba.br/bitstream/ri/7020/2/license.txt https://repositorio.ufba.br/bitstream/ri/7020/1/Rebou%c3%a7as%2c%20Renata%20Cardia.pdf https://repositorio.ufba.br/bitstream/ri/7020/3/Rebou%c3%a7as%2c%20Renata%20Cardia.pdf.txt |
| collection | Repositório Institucional da UFBA |
| description | p.339-347 |
| eu_rights_str_mv | openAccess |
| format | article |
| id | BR_aaa110dfd520f2bb2df7f2f0da20c095 |
| institution | UFBA |
| instname_str | Universidade Federal da Bahia (UFBA) |
| language | eng |
| network_acronym_str | BR |
| network_name_str | Brasil |
| oai_identifier_str | oai:repositorio.ufba.br:ri/7020 |
| publishDate | 2011 |
| publishDateSort | 2011 |
| publisher | Instituto Oceanográfico da Universidade de São Paulo |
| publisherStr | Instituto Oceanográfico da Universidade de São Paulo |
| reponame_str | Repositório Institucional da UFBA |
| spelling | Provenance, transport and composition of Dendê Coast beach sands in Bahia, central coast of Brazil Brazilian Journal of Oceanography Rebouças, Renata Cardia Dominguez, José Maria Landim Bittencourt, Abilio Carlos da Silva Pinto Sediment composition Longshore drift Provenance Bioclastics Beach sands Central coast of Brazil p.339-347 The 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. São Paulo Instituto Oceanográfico da Universidade de São Paulo 1982-436X http://www.repositorio.ufba.br/ri/handle/ri/7020 v. 59, n. 4 |
| 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 |
| status_str | publishedVersion |
| title | 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_short | 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 |
| topic | Sediment composition Longshore drift Provenance Bioclastics Beach sands Central coast of Brazil |
| topic_facet | Sediment composition Longshore drift Provenance Bioclastics Beach sands Central coast of Brazil |
| url | http://www.repositorio.ufba.br/ri/handle/ri/7020 |