Boulder deposition during major tsunami events

Cesar Andrade, Maria C Freitas, Maria A. Oliveira, Carlos M. da Silva, Rachid Omira, Rui Taborda, Maria A. Baptista, Pedro J.M. Costa

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Remarkable accumulations of marine boulders located above present spring tide level occur in two coastal lowlands of the Algarve (Portugal). The size-interval of 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 during transport 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.
Original languageEnglish
Pages (from-to)2054-2068
Number of pages15
JournalEarth Surface Processes and Landforms
Volume36
Issue number15
Early online date28 Sep 2011
DOIs
Publication statusPublished - Dec 2011

Fingerprint

tsunami event
major event
boulder
redeposition
tsunami
present
Portugal
skeletal remains
bioerosion
extreme event
abrasion
sorting
entrainment
event
bivalve
tide
hydrodynamics
fossil
coast
sediment

Keywords

  • boulders
  • storm
  • tsunami
  • sediment transport
  • bioerosion
  • AD 1755
  • Portugal

Cite this

Andrade, C., Freitas, M. C., Oliveira, M. A., da Silva, C. M., Omira, R., Taborda, R., ... Pedro J.M. Costa (2011). Boulder deposition during major tsunami events. Earth Surface Processes and Landforms, 36(15), 2054-2068. https://doi.org/10.1002/esp.2228

Boulder deposition during major tsunami events. / Andrade, Cesar; Freitas, Maria C; Oliveira, Maria A. ; da Silva, Carlos M.; Omira, Rachid; Taborda, Rui; Baptista, Maria A. ; Pedro J.M. Costa.

In: Earth Surface Processes and Landforms, Vol. 36, No. 15, 12.2011, p. 2054-2068.

Research output: Contribution to journalArticle

Andrade, C, Freitas, MC, Oliveira, MA, da Silva, CM, Omira, R, Taborda, R, Baptista, MA & Pedro J.M. Costa 2011, 'Boulder deposition during major tsunami events', Earth Surface Processes and Landforms, vol. 36, no. 15, pp. 2054-2068. https://doi.org/10.1002/esp.2228
Andrade C, Freitas MC, Oliveira MA, da Silva CM, Omira R, Taborda R et al. Boulder deposition during major tsunami events. Earth Surface Processes and Landforms. 2011 Dec;36(15):2054-2068. https://doi.org/10.1002/esp.2228
Andrade, Cesar ; Freitas, Maria C ; Oliveira, Maria A. ; da Silva, Carlos M. ; Omira, Rachid ; Taborda, Rui ; Baptista, Maria A. ; Pedro J.M. Costa. / Boulder deposition during major tsunami events. In: Earth Surface Processes and Landforms. 2011 ; Vol. 36, No. 15. pp. 2054-2068.
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