Polygenetic (tsunami and storm) deposits? A case study from Ushant Island, western France

Regnauld, Hervé; Oszwald, Johan; Planchon, Olivier; Pignatelli, Cosimo; Piscitelli, Alessandra; Mastronuzzi, Giuseppe; Audevard, A.

doi:10.1127/0372-8854/2010/0054s3-0025

Cited by 19 publications

(16 citation statements)

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“…The size of individual clasts and in particular the dimensions of block ESA 9 (9.0 × 4.5 × 3.5 m 3 ), in combination with the documented vertical and lateral transport distances, exceeds any existing literature account, including the often-cited boulder at Sydney's Bondi Beach (Süssmilch, 1912;6.1 × 4.9 × 3.0 m 3 ), and clasts moved during TCs in Japan (Goto et al, 2011) and Jamaica (Khan et al, 2010) as well as during Atlantic winter storms (Williams and Hall, 2004;Regnauld et al, 2010;Cox et al, 2012) (Tables 1, 2). According to the pedestal found at its pre-Haiyan position, block ESA 9 was stationary for a considerable period of time prior to Typhoon Haiyan (cf.…”

Section: Boulder Transport and Flow Velocities Inferred By Inverse Momentioning

confidence: 88%

“…2.35 g cm −3 (Süssmilch, 1912;Verhoef, 1993) reveals only 211 t. Furthermore, questions about the reliability of the report on the storm wave transport in 1912 have been raised, citing pre-1912 photographs of the boulder in its present position (Cass, 2002;Scheffers et al, 2008 (Süssmilch, 2012); often cited as an example for largest coastal boulder dimensions observed to have been moved during a storm (Felton and Crook, 2003;Switzer and Burston, 2010;Terry et al, 2013); values of dimensions and ρ b were taken from the original source (Süssmilch, 1912); a correction factor of 0.8 derived from recent photography (Boyson, 2012;Google Earth/Digital Globe, 2015) of the boulder was applied for calculation of V corr . (Goto et al, 2011 (Regnauld et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Block and boulder transport in Eastern Samar (Philippines) during Supertyphoon Haiyan

May¹,

Engel²,

Brill³

et al. 2015

Earth Surf. Dynam.

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Abstract. Fields of dislodged boulders and blocks record catastrophic coastal flooding during strong storms or tsunamis and play a pivotal role in coastal hazard assessment. Along the rocky carbonate coast of Eastern Samar (Philippines) we documented longshore transport of a block of 180 t and boulders (up to 23.5 t) shifted upslope to elevations of up to 10 m above mean lower low water level during Supertyphoon Haiyan on 8 November 2013. Initiation-of-motion approaches indicate that boulder dislocation occurred with flow velocities of 8.9-9.6 m s −1 , which significantly exceeds depth-averaged flow velocities of a local coupled hydrodynamic and wave model (Delft3D) of the typhoon with a maximum < 1.5 m s −1 . These results, in combination with recently published phase-resolving wave models, support the hypothesis that infragravity waves induced by the typhoon were responsible for the remarkable flooding pattern in Eastern Samar, which are not resolved in phase-averaged storm surge models. Our findings show that tsunamis and hydrodynamic conditions induced by tropical cyclones may shift boulders of similar size and, therefore, demand a careful re-evaluation of storm-related transport where it, based on the boulder's sheer size, has previously been ascribed to tsunamis.

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Section: Boulder Transport and Flow Velocities Inferred By Inverse Momentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Block and boulder transport in Eastern Samar (Philippines) during Supertyphoon Haiyan

May¹,

Engel²,

Brill³

et al. 2015

Earth Surf. Dynam.

View full text Add to dashboard Cite

show abstract

“…With this purpose, several recent studies focused on geomorphological and sedimentological field evidence of catastrophic wave impacts related to historical tsunami events (De Martini et al, 2010;Dominey-Howes, 2002;Goto et al, 2010;Mastronuzzi et al, 2006Mastronuzzi et al, , 2007Regnauld et al, 2010;Scheffers and Kellettat, 2003;Vött et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…In fact, extreme storms or hurricanes have often been used as alternative interpretations, because their wave energy can be comparable to that of tsunamis (Noormets et al, 2002(Noormets et al, , 2004. The distinction between tsunami and extreme storm deposits remains a difficult task, addressed by several authors Benner et al, 2010;Goto et al, 2010;Nandasena et al, 2011;Regnauld et al, 2010). However, this distinction is easier in a relatively enclosed basin such as the Mediterranean mainly due to the relatively low waves regime (Mastronuzzi et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Assessing enigmatic boulder deposits in NE Aegean Sea: importance of historical sources as tool to support hydrodynamic equations

Vacchi

Rovere

Ζουροσ

et al. 2012

Nat. Hazards Earth Syst. Sci.

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Abstract. Due to their importance in the assessment of coastal hazards, several studies have focused on geomorphological and sedimentological field evidence of catastrophic wave impacts related to historical tsunami events. Among them, many authors used boulder fields as important indicators of past tsunamis, especially in the Mediterranean Sea. The aim of this study was to understand the mechanism of deposition of clusters of large boulders, consisting of beachrock slabs, which were found on the southern coasts of Lesvos Island (NE Aegean Sea). Methods to infer the origin of boulder deposits (tsunami vs. storm wave) are often based on hydrodynamic models even if different environmental complexities are difficult to be incorporated into numerical models. In this study, hydrodynamic equations did not provide unequivocal indication of the mechanism responsible for boulder deposition in the study area. Further analyses, ranging from geomorphologic to seismotectonic data, indicated a tsunami as the most likely cause of displacement of the boulders but still do not allow to totally exclude the extreme storm origin. Additional historical investigations (based on tsunami catalogues, historical photos and aged inhabitants interviews) indicated that the boulders are likely to have been deposited by the tsunami triggered by the 6.7 M s Chios-Karaburum earthquake of 1949 or, alternatively, by minor effects of the destructive tsunami produced by 1956's Amorgos Island earthquake. Results of this study point out that, at Mediterranean scale, to flank numerical models with the huge amount of the available historical data become a crucial tool in terms of prevention policies related to catastrophic coastal events.

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“…The reply to this scientific question was the increase of the number of papers examining the nature of these landforms/sediments, focusing their attention on the wave forces necessary to detach, transport and deposit boulders of different size and weight (e.g. Nott, 1997Nott, , 2003Noormets et al, 2004;Scheffers and Kelletat, 2005;Kelletat et al, 2006Mastronuzzi et al, 2006;Scheffers, 2006Scheffers, , 2008Goto et al, 2007Goto et al, , 2010bScicchitano et al, 2007;Imamura et al, 2008;Kelletat, 2008;Benner et al, 2010;Goff et al, 2010;Regnauld et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Terrestrial Laser Scanner techniques in the assessment of tsunami impact on the Maddalena peninsula (south-eastern Sicily, Italy)

et al. 2012

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The coastline of the Maddalena peninsula (south-eastern Sicily, Italy) is characterised by the occurrence of a boulder field associated to an extended soil stripping area and by a gravel/sandy berm. The accumulation of the boulders has been mostly correlated to the impact of the December 28, 1908 tsunami wave. The use of Terrestrial Laser Scanner survey techniques, associated to Differential Global Position System determinations, permits to obtain new data for the assessment of tsunami impact on this coastal area. The computing of the surveyed data using the most recent equations is a useful tool in order to estimate the theoretic inundation limit and to reconstruct its variability in function of the boulders size and of the coastal topography. Moreover, the entire new data set allows to confirm that the hypothesis of the tsunami impact is the most reasonable to explain the occurrence of boulders weighing up to 50 tons on the Maddalena peninsula.

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Polygenetic (tsunami and storm) deposits? A case study from Ushant Island, western France

Cited by 19 publications

References 0 publications

Block and boulder transport in Eastern Samar (Philippines) during Supertyphoon Haiyan

Block and boulder transport in Eastern Samar (Philippines) during Supertyphoon Haiyan

Assessing enigmatic boulder deposits in NE Aegean Sea: importance of historical sources as tool to support hydrodynamic equations

Terrestrial Laser Scanner techniques in the assessment of tsunami impact on the Maddalena peninsula (south-eastern Sicily, Italy)

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