Coast Erosion in Northeast Ireland:-Part II Cliffs and Shore Platforms

McKenna, John; Carter, R. W. G.; Bartlett, Darius

doi:10.1080/00750779209478724

Cited by 20 publications

(11 citation statements)

References 22 publications

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“…Numerous small rockfalls from the Downhill cliffs have been noted previously: McKenna et al (1992) list three such occurrences, November 1987, January 1991 and October 1992. On the latter occasion debris reached and blocked the A2.…”

Section: The Downhill Rockfall Of June 2002mentioning

confidence: 93%

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Examples of recent rockfalls from basalt cliffs in Northern Ireland

Wilson

Cunningham

2003

Irish Geography

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Two examples of recent rockfalls from basalt cliffs in Northern Ireland are described and some trigger mechanisms suggested. The Downhill rockfall of June 2002 resulted in derailment of the Londonderry-Belfast train and occurred following two months of above average rainfall. The Trostan rockfall(s) has (have) resulted in basalt boulders accumulating on the track bed of a late nineteenth century mineral railway, the track having been removed by 1900. Rockfall timing(s) and cause(s) are not known with certainty but the possibility of distant seismic activity acting as a trigger mechanism is introduced. Both examples exceed in magnitude rockfall events recorded elsewhere on the Ulster basalts, and demonstrate the unstable nature of basalt cliffs and the hazards posed to transport routes engineered along their base.

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Section: The Downhill Rockfall Of June 2002mentioning

confidence: 93%

“…Rockfall events on basalt cliffs in Northern Ireland have previously been linked to either freeze-thaw activity (Prior et al, 1971;Douglas, 1980) or heavy rainfall (McKenna et al, 1992). The Downhill 2002 rockfall is likely to have been triggered by heavy rainfall.…”

Section: The Downhill Rockfall Of June 2002mentioning

confidence: 97%

Examples of recent rockfalls from basalt cliffs in Northern Ireland

Wilson

Cunningham

2003

Irish Geography

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Section: Mean Profile Gradientsmentioning

confidence: 99%

“…In any event, the different lithology and surface roughness of this feature in comparison to other parts of the profile which are incised into chalk, may account for some of the mismatch between modelled and measured profiles at this loca�on. For example, McKenna et al (1992) highlight the role of basalt flow structure and weathering horizons in promo�ng irregular, stepped shoreline profiles along the Causeway coast.In contrast to the other sites, at Portrush the closest agreement between modelled and measured profiles is obtained with a compara�vely low cri�cal surf stress value (SF cr = 240) corresponding to much more rapid erosion. The measured profile is also influenced by a covering of modern surficial sediments.…”

mentioning

confidence: 99%

Modelling the development of rocky shoreline profiles along the northern coast of Ireland

2013

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Modelling the Development of Rocky Shoreline Profiles along the Northern Coast of IrelandEmail: robin.edwards@tcd.ie AbstractA mathema�cal wave-erosion model is used to simulate postglacial shoreline profiles along the rocky, high energy coast of the north of Ireland. The wave erosion model is driven by a suite of rela�ve sea-level (RSL) curves for the last 16,000 years produced from four glacial rebound models. Mul�ple runs are performed with different ini�al shore profiles and rock resistances to inves�gate shoreline evolu�on and the significance of inherited morphology on the resultant profile shape. The simulated profiles are then compared with mapped profiles from three areas of the north of Ireland with different lithological and hydrographic proper�es.Modelled profiles generally replicate the overall mean shoreline gradients observed across the region when rock resistance is rela�vely high and erosion rates correspondingly low. In these profiles, breaks in mean slope are observed at depths comparable to the RSL minima in several of the RSL scenarios (at c. -10m, -15m and -20m for North Antrim, Derry and Donegal respec�vely). At Portrush and Portballintrae (Derry), profiles may be influenced by structural controls rela�ng to the underlying basalt surface and the removal of overlying glaciogenic sediments.All RSL scenarios replicate the observed eastward increase in cliff-pla�orm junc�on height, reflec�ng the differen�al glacioisosta�c rebound experienced along the coast. However, the precise eleva�on at which the simulated cliff base occurs is sensi�ve to the choice of RSL scenario, sugges�ng that this parameter may prove useful in evalua�ng glacial rebound model performance. Several of the RSL scenarios generate raised shore pla�orms or terraces in North Antrim and Derry at heights comparable to raised shoreline features reported in the literature. However, no single curve or combina�on of parameters is capable of genera�ng the range of pla�orm and terrace features observed in the bathymetric and topographic data. These misfits are consistent with the idea that many rock pla�orm or terrace features are inherited from an earlier phase or phases of RSL.Keywords: wave erosion, model, rela�ve sea level, rock coast, shore pla�orms, marine terraces, IrelandAbbrevia�ons: Rela�ve Sea Level (RSL); Joint Irish Bathymetric Survey (JIBS); Digital Eleva�on Model (DEM); mean high water spring �de (MHWS), mean high water neap �de (MHWN), mid-�de (MT), mean low water neap �de (MLWN), and mean low water spring �de (MLWS); Ordnance Datum Malin Head (OD) This is the author's final copy of a published manuscript made available via Trinity's Access to Research Archive (TARA). This item is protected by original copyright. For full details visit the TARA website at www.tara.tcd.ie Author's Final Copy Available via Trinity College Dublin's Open Access Repository (www.tara.tcd.ie) 2 Introduc�onThe high energy, wave dominated coastline of the north of Ireland comprises rocky cliffs and shore pla�orms, commonly associated with g...

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“…sand extraction, construction of coastal structures: Carter & Bartlett, 1990). Changes along hard, rocky coastlines were harder to detect and likely consisted of sporadic events rather than progressive change (McKenna et al, 1992). Greenwood & Orford (2008), working within the semi-enclosed waterbody of Strangford Lough, measured erosion rates on unconsolidated cliffs of <1-0.165m/yr with variations in rate linked to cliff height, angle and the local direction and magnitude of fetch.…”

Section: Coastal Erosionmentioning

confidence: 99%

Assessing the Impact of Coastal Erosion on Archaeological Sites: A Case Study from Northern Ireland

Westley¹,

McNeary²

2014

Conservation and Management of Archaeological Sites

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This paper will present research on the vulnerability mapping of coastal archaeological sites currently being undertaken in Northern Ireland. The ultimate aim of this research is improve current predictions of where archaeological sites and landscapes will be at risk in the future from coastal erosion. The initial stage of this approach uses a suite of oblique aerial photographs to construct a baseline of eroding locations and coastal geomorphology. The erosion baseline can then be integrated with existing historic environment records to obtain a coarse first-pass archaeological vulnerability assessment. Subsequent stages can then use this assessment to prioritize future mitigation such as field surveys or monitoring exercises, or conduct further refinements of vulnerability classifications by incorporating information on site type and positioning on a local scale.

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Coast Erosion in Northeast Ireland:-Part II Cliffs and Shore Platforms

Cited by 20 publications

References 22 publications

Examples of recent rockfalls from basalt cliffs in Northern Ireland

Examples of recent rockfalls from basalt cliffs in Northern Ireland

Modelling the development of rocky shoreline profiles along the northern coast of Ireland

Assessing the Impact of Coastal Erosion on Archaeological Sites: A Case Study from Northern Ireland

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