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(Article of periodic en Anglais - 2011)

Document title

Boulder deposition during major tsunami events

Authors(s) and Affiliation(s)

COSTA P.J.M. (1) ; ANDRADE C. (1) ; FREITAS M.C. (1) ; OLIVEIRA M.A. (1) ; DA SILVA C.M. (1) ; OMIRA R. (2) ; TABORDA R. (3) ; BAPTISTA M.A. (4) ; DAWSON A.G. (5) ;
(1) Centro de Geologia, Fac. de Ciências, Univ., Lisboa, PORTUGAL
(2) IDL, Univ., Lisboa, PORTUGAL
(3) LATTEX-IDL, Dep. de Geologia, Fac de Ciências, Univ., Lisboa, PORTUGAL
(4) ISEL, Inst. Superior Engenharia, Lisboa, PORTUGAL
(5) School of Geosciences, Geography and Environment, Univ., Aberdeen, ROYAUME-UNI

Abstract

A remarkable accumulation of marine boulders located above the present spring tide level has occurred in 2 coastal lowlands of the Algarve (Portugal). 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 during transport and redeposition was not significant. The AA. envisage boulder deposition as having taken place during the Lisbon tsunami of AD 1755. The AA. 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

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2011, vol. 36, no15 [pp. 2054-2068]

Bibliographic references : 78 ref.

Collation : 11 fig., 4 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.2228

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2012
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