Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/2113
Título: Boulder deposition during major tsunami events
Autor: Costa, Pedro J. M.
Andrade, Cesar
Freitas, Maria C.
Oliveira, Maria A.
da Silva, Carlos M.
Omira, Rachid
Taborda, Rui
Baptista, Maria Ana Carvalho Viana
Dawson, Alastair G.
Palavras-chave: Boulders
Storm
Tsunami
Sediment transport
Bioerosion
1755
Portugal
High-energy events
Southwestern Spain
Sedimentary Record
Lisbon earthquake
Extreme waves
Ionian coast
Portugal
Transport
Algarve
Data: Dez-2011
Editora: Wiley-Blackwell
Citação: COSTA, Pedro J. M.; ANDRADE, Cesar; FREITAS, Maria C; OLIVEIRAl, Maria A.; da SILVA, Carlos M.; OMIRA, Rachid; TABORDA, Rui; BAPTISTA, Maria A.; DAWSON, Alastair G. Boulder deposition during major tsunami events. Earth Surface Processes and Landforms. ISSN 0197-9337. Vol. 36, n.º 15 (2011) p. 2054-2068.
Resumo: A remarkable accumulation of marine boulders located above the present spring tide level has occurred in two coastal lowlands of the Algarve (Portugal). The size-interval of the particles studied here is seldom reported in the literature in association with extreme events of coastal inundation, thus making this study of relevance to many other coasts worldwide. The spreads of boulders extend several hundred meters inland and well beyond the present landward limit of storm activity. The marine origin of the boulders is demonstrated by well-developed macro-bioerosion sculpturing and in situ skeletal remains of endolithic shallow marine bivalves. The good state preservation of the fossils within the boulders indicates that abrasion duringtransport and redeposition was not significant. We envisage boulder deposition as having taken place during the Lisbon tsunami of ad 1755 through the simultaneous landward entrainment of coarse particles from nearshore followed by rapid shoreward suspended-dominated transport and non-graded redeposition that excluded significant sorting by weight or boulder dimensions. We use numerical hydrodynamic modeling of tsunami (and storm) waves to test the observational data on boulder dimensions (density, size, distribution) on the most likely processes of sediment deposition. This work demonstrates the effectiveness of the study of boulder deposits in tsunami reconstruction. Copyright (C) 2011 John Wiley & Sons, Ltd.
Peer review: yes
URI: http://hdl.handle.net/10400.21/2113
ISSN: 0197-9337
Aparece nas colecções:ISEL - Eng. Civil - Artigos

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