Repository logo
 
Publication

Identification of Tsunami deposits and their impact on coastal zones : a study case of the Boca do Rio estuary (Algarve , Portugal)

dc.contributor.authorFont, Eric
dc.contributor.authorVeiga-Pires, C.
dc.contributor.authorPozo, Manuel
dc.contributor.authorNave, Silvia
dc.contributor.authorCostas, Susana
dc.contributor.authorMuñoz, Francisco Ruiz
dc.contributor.authorAbad, Manuel
dc.date.accessioned2013-07-29T16:44:37Z
dc.date.available2013-07-29T16:44:37Z
dc.date.issued2013-02
dc.date.updated2013-07-18T22:47:53Z
dc.description.abstractTsunamis are unforeseeable phenomena and therefore one of the most devastating natural disasters in terms of human and economic losses. Their impact on coastal and nearshore zones is substantial and need to be accurately evaluated to improve their prevention and management. In the last decades, numerous investigations focused on the identification of paleotsunamis in order to evaluate their frequency in the geological record. However, because storm- and tsunami-deposits are generated by similar depositional mechanisms, their discrimination using classic sedimentological methods is an elusive prospect. A promising approach is to couple classic geological criteria with geophysical and geochemical proxies to search for new benchmarks of tsunami deposits and to integrate them into a multi-disciplinary study. To test our method, we investigate the 1755 Lisbon tsunami deposit from the Boca do Rio estuary and other Tsunami-induced deposits from Algarve (Portugal). First results show that, Sr and Ca are enriched in the tsunami layer probably linked to the presence of shelled organism. Contrarily, others marine seawater indicators, such as Ba and Br, which are usually more concentrated in brackish than in fresh water, and heavy minerals, which are generally used as high energy event indicators, are depleted in the Tsunami deposit. Very low magnetic susceptibility values for the Tsunami deposit also indicate a dilution of iron oxides, reworked from the estuarine clays, within the huge volumes of quartz and carbonate (i.e. diamagnetic), issued from the abrasion of the littoral sandy dune and the surrounding carbonated cliffs. Diffusive Reflective Spectrophotometry analyses show changes in the siliclastic fraction on the sediments from above and below the tsunami layer. These apparent colour variations seem linked to the deposition of finer siliclastic particles after the tsunami, rather than to mineralogical composition. These data suggest that the high energy event affected the geomorphology of the estuary in such a way that it could induce a mis-interpretation of the geological record regarding local sea level changes and coastal evolution history.por
dc.identifier.citationFont, Eric; Veiga-Pires, Cristina; Pozo, Manuel; Nave, Silvia; Costa, Susana; Muñoz, Francisco Ruiz; Abad, Manuel. Identification of Tsunami deposits and their impact on coastal zones : a study case of the Boca do Rio estuary (Algarve, Portugal), Trabalho apresentado em 4th Open Science Meeting, In 4th Open Science Meeting, Goa, 10-15 February, 2013.por
dc.identifier.otherAUT: CVP01371;
dc.identifier.urihttp://hdl.handle.net/10400.1/2832
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherPAGESpor
dc.relation.publisherversionhttp://pages-igbp.org/download/abstracts2013/OSM2013abstract_book.pdfpor
dc.subjectRock magnetismpor
dc.subjectEstuarypor
dc.subjectTsunami depositpor
dc.subjectNatural hazardspor
dc.titleIdentification of Tsunami deposits and their impact on coastal zones : a study case of the Boca do Rio estuary (Algarve , Portugal)por
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceGoa, Indiapor
oaire.citation.endPage156por
oaire.citation.startPage155por
oaire.citation.titleThe past: a compass for future earthpor
person.familyNameVeiga-Pires
person.familyNameCostas
person.givenNameCristina
person.givenNameSusana
person.identifier113325
person.identifier1448818
person.identifier.ciencia-id4A1F-CEDA-E66C
person.identifier.ciencia-idAF19-9EEE-7550
person.identifier.orcid0000-0002-9323-0723
person.identifier.orcid0000-0002-4005-077X
person.identifier.ridB-5144-2008
person.identifier.scopus-author-id7801372905
person.identifier.scopus-author-id9043656500
rcaap.rightsopenAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublicationd1541efa-0eaa-48dc-aea3-a1e64aa0065a
relation.isAuthorOfPublication62d73183-10ba-42ca-80a7-458c42d1375b
relation.isAuthorOfPublication.latestForDiscovery62d73183-10ba-42ca-80a7-458c42d1375b

Files

Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
Font 2013 OSM-Pages_GOA.pdf
Size:
700.2 KB
Format:
Adobe Portable Document Format
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description: