Imprints of the 1755 tsunami in the Tróia Peninsula shoreline, Portugal

Rebelo, Luís; Brito, Pedro; Ferraz, Marco; Prudêncio, Maria Isabel; Burbidge, Christopher Ian

doi:10.2112/si65-138.1

Cited by 5 publications

(5 citation statements)

References 6 publications

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“…These yielded on average 1,800 cts Gy À1 and repeat dose-response points within 6 %. Zero dose response was on average equivalent to 0.2 Gy, however Tr oia samples with absorbed doses as low as 0.1 Gy yielded ages in agreement with historic records (Rebêlo et al 2013). On average three results per sample were rejected, where systematic effects on absorbed dose as a function of preheat temperature (180-280 C) and/or repeat points were significant relative to statistical uncertainties.…”

Section: Age Determinationsupporting

confidence: 73%

“…This architecture is interpreted as a temporary stabilization of the shoreline around 3,300 years ago. Shoreline progradation continued around 1,100 years ago before being interrupted by the last major phase of instability and hiatus in deposition along the spit around 250 years ago, coinciding with the Lisbon tsunami (Rebêlo et al 2013).…”

Section: Progradation Ratesmentioning

confidence: 99%

“…Seaward rotation and progradation of the spit is expected to become more pronounced once growth of the ebb delta equilibrates. Moreover, shoreline retreat, barrier scarping and blowout formation around 250 years ago were related to the erosive effect of the tsunami of Lisbon in 1755 AD (Rebêlo et al 2013). …”

Section: Barrier Progradationmentioning

confidence: 99%

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The Joint History of Tróia Peninsula and Sado Ebb-Delta

Rebelo

Brito

Burbidge³

et al. 2015

Coastal Research Library

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Traditionally, the study of coastal evolution has focused on emergent barriers or stratigraphic sequences on the adjacent shelf, but seldom are these two systems studied holistically or the information combined into a single model. Here, we combine data sets from the emerged and submerged sectors of a prograding coast, from the coastal dune to the innermost continental shelf, to reconstruct the long-term history of shelf reworking and spit elongation of Tr oia Peninsula in Portugal. This analysis involves synthesizing high-resolution reflection seismic profiles from the shoreface, Ground Penetrating Radar images from the emerged sand barrier, high resolution digital terrain models, and Optically Stimulated Luminescence and radiocarbon dating of sediment samples from the emergent sand barrier and backbarrier. The results document the growth of the sandy peninsula in five major phases of progradation represented by massive foredunes separated by hiatuses of sedimentation and periods of shoreline stability. Formation of the peninsula began circa 6,500 years ago by spit elongation from the south as documented by the oldest beach sediments within the spit. The spit enlarged until a tidal inlet was formed around 3,300 years ago, which caused the construction of the ebb-tidal delta. The latter sequestrated the sand supplied to the spit inhibiting spit progradation until the ebb delta reached an equilibrium volume, allowing shoreline

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Section: Age Determinationsupporting

confidence: 73%

Section: Progradation Ratesmentioning

confidence: 99%

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The Joint History of Tróia Peninsula and Sado Ebb-Delta

Rebelo

Brito

Burbidge³

et al. 2015

Coastal Research Library

Self Cite

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“…Working on the west coast of North America, close to Washington and Vancouver Island, Huntley and Clague [108] were able to date two tsunami events using this approach. Other more recent studies that have attempted to date tsunami events include [109,110]. It should be noted, however, that the identification of tsunami deposits within the coastal zone remains a subject of debate [for example , 111].…”

Section: Earthquake Related Studiesmentioning

confidence: 99%

Luminescence Chronology

Munyikwa¹

2014

Geochronology - Methods and Case Studies

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“…GPR has been used to reconstruct coastal progradation by mapping subsurface scarps and accretionary units, which in turn represent the morphological response of past erosional events and subsequent depositional phases, respectively (Buynevich et al, 2007). Furthermore, recent works have shown the potential of this technique deciphering the impacts of tsunamis through the analysis of the internal architecture of tsunami-generated deposits (Switzer et al, 2006;Koster et al, 2011Koster et al, , 2014 or imaging erosional imprints over coastal barriers (Rebêlo et al, 2013;Kain et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

How did the AD 1755 tsunami impact on sand barriers across the southern coast of Portugal?

et al. 2016

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Tsunamis are highly energetic events that may destructively impact the coast. Resolving the degree of coastal resilience to tsunamis is extremely difficult and sometimes impossible. In part, our understanding is constrained by the limited number of contemporaneous examples and by the high dynamism of coastal systems. In fact, longterm changes of coastal systems can mask the evidence of past tsunamis, leaving us a short or incomplete sedimentary archive. Here, we present a multidisciplinary approach involving sedimentological, geomorphological and geophysical analyses and numerical modelling of the AD 1755 tsunami flood on a coastal segment located within the southern coast of Portugal. In particular, the work focuses on deciphering the impact of the tsunami waves over a coastal sand barrier enclosing two lowlands largely inundated by the tsunami flood. Erosional features documented by geophysical data were assigned to the AD 1755 event with support of sedimentological and age estimation results. Furthermore, these features allowed the calibration of the simulation settings to reconstruct the local conditions and establish the run-up range of the AD 1755 tsunami when it hit this coast (6-8 m above mean sea level). Our work highlights the usefulness of erosional imprints preserved in the sediment record to interpret the impact of the extreme events on sand barriers.

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Imprints of the 1755 tsunami in the Tróia Peninsula shoreline, Portugal

Cited by 5 publications

References 6 publications

The Joint History of Tróia Peninsula and Sado Ebb-Delta

The Joint History of Tróia Peninsula and Sado Ebb-Delta

Luminescence Chronology

How did the AD 1755 tsunami impact on sand barriers across the southern coast of Portugal?

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