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Duffy, M.J.; Devoy, R. J. N.

doi:10.1023/a:1003619813284

Cited by 19 publications

(3 citation statements)

References 19 publications

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“…Sedimentary environments along the west coast of Ireland are typically sandy, dynamic and storm dominated due to their exposed aspect (Delaney and Devoy, 1995; Duffy and Devoy, 1998). Nevertheless, low energy embayments are present in sheltered locations, providing suitable conditions for the formation of salt marshes and the accumulation of fine-grained and organic sediments (Curtis and Skeffington, 1998).…”

Section: Study Areamentioning

confidence: 99%

Holocene relative sea-level changes in northwest Ireland: An empirical test for glacial isostatic adjustment models

2023

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The late-Quaternary relative sea-level (RSL) history of Ireland is complex, positioned at the margins of the former British-Irish Ice Sheet, and subject to the influence of ice unloading and forebulge collapse. Geophysical models of post-glacial isostatic adjustment (GIA) provide estimates of the pattern of RSL change since deglaciation which may be tested and validated with empirical data from proxy records. For the region of northwest Ireland, there is a paucity of high-quality RSL data and, therefore, equivocal evidence to support the GIA models that predict a mid to Late-Holocene RSL highstand of between +0.5 and +2 m above present. This study aims to investigate this model-data discrepancy by reconstructing RSL change from a near continuous salt-marsh sequence at Bracky Bridge, Donegal, spanning the last ca. 2500 years. We develop a transfer function model to reconstruct the vertical position of sea level using a regional diatom training set to quantify the indicative meaning and predict the palaeomarsh elevation of the core samples. A chronology is provided by a combination of 14C and 210Pb data, with sample specific ages derived from an age-depth model using a Bayesian framework. Our reconstruction shows ca. 2 m of relative sea-level rise in the past 2500 years. This is not compatible with some previously published sea-level index points from the region, which we re-interpret as freshwater/terrestrial limiting data. These results do not provide any evidence to support a Mid-Holocene RSL highstand above present sea level. Whilst none of the available GIA models replicate the timing and magnitude of the Late-Holocene RSL rise in our reconstruction, those which incorporate a thick and extensive British-Irish Sea Ice Sheet provide the best fit.

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Section: Study Areamentioning

confidence: 99%

Holocene relative sea-level changes in northwest Ireland: An empirical test for glacial isostatic adjustment models

2023

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“…However, past and contemporary observations in the study area, together with modelled outputs of past and future wave and storm surges for the south coast of Ireland (e.g., Devoy et al, 2004;Wang et al, 2008;Gallagher et al, 2013Gallagher et al, , 2014Gallagher et al, , 2016Gleeson et al, 2013) (Figure 9), indicate that storm action only reaches maximum heights of <10-12m ODM. Given knowledge of former sea level positions and coastal development in the region, there is no evidence that surge levels have been higher in the last c. 2000 years (e.g., Duffy et al, 1999;Devoy et al, 2006;Delaney et al, 2012). Since the Sands Unit at Tralispean is developed predominantly at elevations above c. 10m ODM, and extends to heights of c. +18.5m ODM, this alone suggests that a storm event, or even a temporally linked series of storms, is unlikely to explain emplacement of the Sands Unit.…”

Section: A Large Storm Surge Event or A Series Of Stormsmentioning

confidence: 99%

Investigation of an Elevated Sands Unit at Tralispean Bay, South-West Ireland – Potential High Energy Marine Event

Cronin,

Devoy,

Bartlett

et al. 2019

IrishGeog

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A sequence of high elevation sands containing both broken and whole marine shells, as well as many mega-sized, raft-shaped boulders (1-3m across) has been discovered at Tralispean Bay, West Cork, Ireland. Ground-Penetrating Radar (GPR), ground surveying and differential GPS (dGPS) show that the sediments cover an area of c.0.75ha, reaching a maximum height of c.+18.5m ODM, with interconnected pockets of sand varying in thickness of up to 1m. Coring, lithostratigraphic study, granulometry, organics loss-on-ignition and carbonate content analyses, together with examination of micro- and macrofossils, indicate that the shelly sands were deposited rapidly, under high energy conditions. Informal interviews with local residents, as well as the extent of the sands, suggest that the deposit is not the result of human actions. Elevations reached by the sediments, the presence of mega-boulders, and other indicators make it unlikely that these sediments arose from storm activity. It is possible that they have been deposited as the result of a tsunami. The radiocarbon (AMS) date obtained places the age of such an event at 1465 AD (Cal BP 485). At present, no clear historical record has been identified of any tsunami impacts affecting the south coast of Ireland other than the Lisbon earthquake of 1755.

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“…When marine structures are built in places where there are no longer wave measurements, wave characteristics estimated from wind data can be considered. Two numerical methods can be applied for these purposes; in the first method, defined as the shore protection manual (SPM) method, both significant Water 2022, 14, 843 2 of 13 wave height H m 0 (m) and peak wave period T p (s) can be obtained by employing wind data [12][13][14][15][16][17][18]. The second method is the so-called spectral method [19,20].…”

Section: Introductionmentioning

confidence: 99%

On the Indirect Estimation of Wind Wave Heights over the Southern Coasts of Caspian Sea: A Comparative Analysis

Lama

Sadeghifar

Azad

et al. 2022

Water

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The prediction of ocean waves is a highly challenging task in coastal and water engineering in general due to their very high randomness. In the present case study, an analysis of wind, sea flow features, and wave height in the southern coasts of the Caspian Sea, especially in the off-coast sea waters of Mazandaran Province in Northern Iran, was performed. Satellite altimetry-based significant wave heights associated with the period of observation in 2016 were validated based on those measured at a buoy station in the same year. The comparative analysis between them showed that satellite-based wave heights are highly correlated to buoy data, as testified by a high coefficient of correlation r (0.87), low Bias (0.063 m), and root-mean-squared error (0.071 m). It was possible to assess that the dominant wave direction in the study area was northwest. Considering the main factors affecting wind-induced waves, the atmospheric framework in the examined sea region with high pressure was identified as the main factor to be taken into account in the formation of waves. The outcomes of the present research provide an interesting methodological tool for obtaining and processing accurate wave height estimations in such an intricate flow playground as the southern coasts of the Caspian Sea.

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Cited by 19 publications

References 19 publications

Holocene relative sea-level changes in northwest Ireland: An empirical test for glacial isostatic adjustment models

Holocene relative sea-level changes in northwest Ireland: An empirical test for glacial isostatic adjustment models

Investigation of an Elevated Sands Unit at Tralispean Bay, South-West Ireland – Potential High Energy Marine Event

On the Indirect Estimation of Wind Wave Heights over the Southern Coasts of Caspian Sea: A Comparative Analysis

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