Mesoscale temporal changes to foredunes at Inch Spit, south-west Ireland

JD Orford, Andrew Cooper, John McKenna

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

The history of foredune development and loss is examined on a decadal-scale basis at Inch Spit at the head of Dingle Bay. Inch currently has a foreland area (2 km(2)) with four low foredune ridges fronting the southern section (2.5 km) of the barrier. Analysis of maps (1842 & 1898) airphotographs (1949, 1967 gr. 1973) and field surveys (1993/94) of the shoreline has supported an interpretation of two to three possible sequences of sudden erosion of the foredunes and subsequent redeposition and reworking of foredunes over periods of 30 to 50 years. The erosion and deposition of the foredunes have been analysed in terms of variation in the following; human activity, sea-level, storm activity and longterm (annual to decadal) atmospheric forcing changes, but none of these factors individually account for foredune changes. It is argued on circumstantial evidence that the role of extreme storms and associated surge is the most probable key to understanding sudden foredune disappearance. Wave refraction modelling of extreme events has helped to specify the principal control on foredune loss. The result of specific microscale triggers (days) leading to mesoscale changes (decadal) is examined.
LanguageEnglish
Pages439-461
JournalAnnals of Geomorphology
Volume43
Issue number4
Publication statusPublished - Dec 1999

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spit
erosion
redeposition
atmospheric forcing
extreme event
reworking
refraction
field survey
shoreline
human activity
sea level
history
modeling
loss
analysis

Cite this

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title = "Mesoscale temporal changes to foredunes at Inch Spit, south-west Ireland",
abstract = "The history of foredune development and loss is examined on a decadal-scale basis at Inch Spit at the head of Dingle Bay. Inch currently has a foreland area (2 km(2)) with four low foredune ridges fronting the southern section (2.5 km) of the barrier. Analysis of maps (1842 & 1898) airphotographs (1949, 1967 gr. 1973) and field surveys (1993/94) of the shoreline has supported an interpretation of two to three possible sequences of sudden erosion of the foredunes and subsequent redeposition and reworking of foredunes over periods of 30 to 50 years. The erosion and deposition of the foredunes have been analysed in terms of variation in the following; human activity, sea-level, storm activity and longterm (annual to decadal) atmospheric forcing changes, but none of these factors individually account for foredune changes. It is argued on circumstantial evidence that the role of extreme storms and associated surge is the most probable key to understanding sudden foredune disappearance. Wave refraction modelling of extreme events has helped to specify the principal control on foredune loss. The result of specific microscale triggers (days) leading to mesoscale changes (decadal) is examined.",
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Mesoscale temporal changes to foredunes at Inch Spit, south-west Ireland. / Orford, JD; Cooper, Andrew; McKenna, John.

In: Annals of Geomorphology, Vol. 43, No. 4, 12.1999, p. 439-461.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Mesoscale temporal changes to foredunes at Inch Spit, south-west Ireland

AU - Orford, JD

AU - Cooper, Andrew

AU - McKenna, John

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N2 - The history of foredune development and loss is examined on a decadal-scale basis at Inch Spit at the head of Dingle Bay. Inch currently has a foreland area (2 km(2)) with four low foredune ridges fronting the southern section (2.5 km) of the barrier. Analysis of maps (1842 & 1898) airphotographs (1949, 1967 gr. 1973) and field surveys (1993/94) of the shoreline has supported an interpretation of two to three possible sequences of sudden erosion of the foredunes and subsequent redeposition and reworking of foredunes over periods of 30 to 50 years. The erosion and deposition of the foredunes have been analysed in terms of variation in the following; human activity, sea-level, storm activity and longterm (annual to decadal) atmospheric forcing changes, but none of these factors individually account for foredune changes. It is argued on circumstantial evidence that the role of extreme storms and associated surge is the most probable key to understanding sudden foredune disappearance. Wave refraction modelling of extreme events has helped to specify the principal control on foredune loss. The result of specific microscale triggers (days) leading to mesoscale changes (decadal) is examined.

AB - The history of foredune development and loss is examined on a decadal-scale basis at Inch Spit at the head of Dingle Bay. Inch currently has a foreland area (2 km(2)) with four low foredune ridges fronting the southern section (2.5 km) of the barrier. Analysis of maps (1842 & 1898) airphotographs (1949, 1967 gr. 1973) and field surveys (1993/94) of the shoreline has supported an interpretation of two to three possible sequences of sudden erosion of the foredunes and subsequent redeposition and reworking of foredunes over periods of 30 to 50 years. The erosion and deposition of the foredunes have been analysed in terms of variation in the following; human activity, sea-level, storm activity and longterm (annual to decadal) atmospheric forcing changes, but none of these factors individually account for foredune changes. It is argued on circumstantial evidence that the role of extreme storms and associated surge is the most probable key to understanding sudden foredune disappearance. Wave refraction modelling of extreme events has helped to specify the principal control on foredune loss. The result of specific microscale triggers (days) leading to mesoscale changes (decadal) is examined.

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SP - 439

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