Competing mechanisms for boulder deposition on the southeast Australian coast

Switzer, Adam D.; Burston, Joanna M

doi:10.1016/j.geomorph.2009.02.009

Cited by 124 publications

(96 citation statements)

References 44 publications

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“…7). Since these flow velocities would have caused rolling transport of ESA 9, ambiguities remain for the joint-bounded boulder scenario, which tends towards significant overestimation (Switzer and Burston, 2010;Etienne, 2012). Discrepancies may for instance be related to the overestimation of strain forces between the block and the strongly karstified reef body, or to the underestimation of the waves' impact and lift forces approaching the cliffs and their associated jets (Hansom et al, 2008).…”

Section: Boulder Transport and Flow Velocities Inferred By Inverse Momentioning

confidence: 99%

“…For the block at Bondi Beach the original source gives a weight of "about 235 t" (Süssmilch, 1912, p. 155), whereas multiplication of axes and local rock density of ca. 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: 99%

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

“…Places where this ambiguity has been examined include New Zealand (Goff and others, 2004), Australia (Switzer and Burston, 2010), Spain (Lario and others, 2010), the Netherlands Antilles (Morton and others, 2006;Engel and others, 2012), Mexico (Ramirez Herrera and others, 2012), and the British Virgin Islands (Atwater and others, 2012a).…”

Section: Distinguishing Between Tsunami and Storm Depositsmentioning

confidence: 99%

Assessing inundation hazards to nuclear powerplant sites using geologically extended histories of riverine floods, tsunamis, and storm surges

O’Connor¹,

Atwater²,

Cohn³

et al. 2014

Scientific Investigations Report

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“…Los depósitos de bloques imbricados y alineados a los largo de la costa, ya sea en un solo cordón o en varios cordones superpuestos, son claros indicadores de trasporte asociado a tsunami, según Browne (2011), Weiss (2012, Scheffers y Kinis (2014) y Roig-Munar et al (2017). En la última década el debate sobre el transporte de bloques para discernir su origen entre tsunami versus temporales ha obligado a considerar con más detalle el papel de la tormenta sobre las costas rocosas (Etienne y París, 2010;Switzer y Burston, 2010;Roig-Munar et al, 2017). En este sentido se han desarrollado ecuaciones que permiten estimar las alturas de agua necesarias sobre un bloque, bajo tres supuestos; bloques sumergidos, bloques subaéreos, y bloques delimitados por juntas o fracturas (Nott, 2003;Barbano et al, 2010, Pignatelli et al, 2010Engel y May, 2012).…”

Section: Introductionunclassified

Análisis morfométrico de bloques de tsunami en la isla de Formentera, islas Baleares

Munar¹,

Rodríguez-Perea

Ferrer

et al. 2017

CyG

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Abstract86 boulders of large size, located on two areas of the island of Formentera and the islets of s'Espardell and s'Espalmador are characterized morphometrically. These boulders are located on vertical cliffs corresponding to calcareous platforms of the Miocene and Quaternary. The analyzed areas present different clusters of blocks: both individually deposited and in imbricated ridges and all are associated to a defined source area from where these blocks were uprooted. The blocks have an average weight of 9.93 Mg, and are located at a medium distance from the cliff edge of 54.3 m. The orientation of the blocks presents an average of 190º, coinciding with the simulation of the trajectories and their refractions of the tsunamis generated in the N of Africa. The hydrodynamic values required for starting and displace of these blocks have been calculated under different assumptions: submerged blocks, blocks delimited by joints and subaerial blocks, obtaining the columns of water necessary for their displacement. The size of the blocks, their arrangement, and their distance from the cliff edge, orientation and the values of the columns of water (run-up) necessaries for their displacement allow us to identify these blocks as sediments associated with tsunamis coming from the N of Algeria.

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Competing mechanisms for boulder deposition on the southeast Australian coast

Cited by 124 publications

References 44 publications

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

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

Assessing inundation hazards to nuclear powerplant sites using geologically extended histories of riverine floods, tsunamis, and storm surges

Análisis morfométrico de bloques de tsunami en la isla de Formentera, islas Baleares

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