Recent high-energy marine events in the sediments of Lagoa de Óbidos and Martinhal (Portugal): recognition, age and likely causes
A key issue in coastal hazards research is the need to distinguish sediments deposited by past extreme storms from those of past tsunamis. This study contributes to this aim by investigating patterns of sedimentation associated with extreme coastal flood events, in particular, within the Lagoa de Ób...
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ftdoajarticles:oai:doaj.org/article:eaa8701a33a14679b8085b0f733e8ca5 2023-05-15T17:35:42+02:00 Recent high-energy marine events in the sediments of Lagoa de Óbidos and Martinhal (Portugal): recognition, age and likely causes P. J. M. Costa S. A. G. Leroy J. L. Dinis A. G. Dawson S. Kortekaas 2012-05-01T00:00:00Z https://doi.org/10.5194/nhess-12-1367-2012 https://doaj.org/article/eaa8701a33a14679b8085b0f733e8ca5 EN eng Copernicus Publications http://www.nat-hazards-earth-syst-sci.net/12/1367/2012/nhess-12-1367-2012.pdf https://doaj.org/toc/1561-8633 https://doaj.org/toc/1684-9981 doi:10.5194/nhess-12-1367-2012 1561-8633 1684-9981 https://doaj.org/article/eaa8701a33a14679b8085b0f733e8ca5 Natural Hazards and Earth System Sciences, Vol 12, Iss 5, Pp 1367-1380 (2012) Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 Geology QE1-996.5 article 2012 ftdoajarticles https://doi.org/10.5194/nhess-12-1367-2012 2022-12-31T14:49:09Z A key issue in coastal hazards research is the need to distinguish sediments deposited by past extreme storms from those of past tsunamis. This study contributes to this aim by investigating patterns of sedimentation associated with extreme coastal flood events, in particular, within the Lagoa de Óbidos (Portugal). The recent stratigraphy of this coastal lagoon was studied using a wide range of techniques including visual description, grain-size analysis, digital and x-ray photography, magnetic susceptibility and geochemical analysis. The sequence was dated by 14 C, 210 Pb and Optically Stimulated Luminescence. Results disclose a distinctive coarser sedimentary unit, within the top of the sequence studied, and shown in quartz sand by the enrichment of elements with marine affinity (e.g., Ca and Na) and carbonates. The unit fines upwards and inland, thins inland and presents a sharp erosive basal contact. A noticeable post-event change in the sedimentary pattern was observed. The likely agent of sedimentation is discussed here and the conceivable association with the Great Lisbon tsunami of AD 1755 is debated, while a comparison is attempted with a possibly synchronous deposit from a tsunami in Martinhal (Algarve, Portugal). The possibility of a storm origin is also discussed in the context of the storminess of the western Portuguese coast and the North Atlantic Oscillation. This study highlights certain characteristics of the sedimentology of the deposits that may have a value in the recognition of extreme marine inundation signatures elsewhere in the world. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Directory of Open Access Journals: DOAJ Articles Natural Hazards and Earth System Sciences 12 5 1367 1380 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 Geology QE1-996.5 P. J. M. Costa S. A. G. Leroy J. L. Dinis A. G. Dawson S. Kortekaas Recent high-energy marine events in the sediments of Lagoa de Óbidos and Martinhal (Portugal): recognition, age and likely causes |
topic_facet |
Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 Geology QE1-996.5 |
description |
A key issue in coastal hazards research is the need to distinguish sediments deposited by past extreme storms from those of past tsunamis. This study contributes to this aim by investigating patterns of sedimentation associated with extreme coastal flood events, in particular, within the Lagoa de Óbidos (Portugal). The recent stratigraphy of this coastal lagoon was studied using a wide range of techniques including visual description, grain-size analysis, digital and x-ray photography, magnetic susceptibility and geochemical analysis. The sequence was dated by 14 C, 210 Pb and Optically Stimulated Luminescence. Results disclose a distinctive coarser sedimentary unit, within the top of the sequence studied, and shown in quartz sand by the enrichment of elements with marine affinity (e.g., Ca and Na) and carbonates. The unit fines upwards and inland, thins inland and presents a sharp erosive basal contact. A noticeable post-event change in the sedimentary pattern was observed. The likely agent of sedimentation is discussed here and the conceivable association with the Great Lisbon tsunami of AD 1755 is debated, while a comparison is attempted with a possibly synchronous deposit from a tsunami in Martinhal (Algarve, Portugal). The possibility of a storm origin is also discussed in the context of the storminess of the western Portuguese coast and the North Atlantic Oscillation. This study highlights certain characteristics of the sedimentology of the deposits that may have a value in the recognition of extreme marine inundation signatures elsewhere in the world. |
format |
Article in Journal/Newspaper |
author |
P. J. M. Costa S. A. G. Leroy J. L. Dinis A. G. Dawson S. Kortekaas |
author_facet |
P. J. M. Costa S. A. G. Leroy J. L. Dinis A. G. Dawson S. Kortekaas |
author_sort |
P. J. M. Costa |
title |
Recent high-energy marine events in the sediments of Lagoa de Óbidos and Martinhal (Portugal): recognition, age and likely causes |
title_short |
Recent high-energy marine events in the sediments of Lagoa de Óbidos and Martinhal (Portugal): recognition, age and likely causes |
title_full |
Recent high-energy marine events in the sediments of Lagoa de Óbidos and Martinhal (Portugal): recognition, age and likely causes |
title_fullStr |
Recent high-energy marine events in the sediments of Lagoa de Óbidos and Martinhal (Portugal): recognition, age and likely causes |
title_full_unstemmed |
Recent high-energy marine events in the sediments of Lagoa de Óbidos and Martinhal (Portugal): recognition, age and likely causes |
title_sort |
recent high-energy marine events in the sediments of lagoa de óbidos and martinhal (portugal): recognition, age and likely causes |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
https://doi.org/10.5194/nhess-12-1367-2012 https://doaj.org/article/eaa8701a33a14679b8085b0f733e8ca5 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Natural Hazards and Earth System Sciences, Vol 12, Iss 5, Pp 1367-1380 (2012) |
op_relation |
http://www.nat-hazards-earth-syst-sci.net/12/1367/2012/nhess-12-1367-2012.pdf https://doaj.org/toc/1561-8633 https://doaj.org/toc/1684-9981 doi:10.5194/nhess-12-1367-2012 1561-8633 1684-9981 https://doaj.org/article/eaa8701a33a14679b8085b0f733e8ca5 |
op_doi |
https://doi.org/10.5194/nhess-12-1367-2012 |
container_title |
Natural Hazards and Earth System Sciences |
container_volume |
12 |
container_issue |
5 |
container_start_page |
1367 |
op_container_end_page |
1380 |
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1766134957624786944 |