Contemporary morphodynamics of a high-energy headland-embayment shoreface

Joni T. Backstrom, Derek Jackson, Andrew Cooper

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A 2-year investigation into shoreface morphodynamic behaviour off a high-energy headland-embayment coast in Northern Ireland reveals important process-response mechanisms that cannot be explained solely by existing conceptual models. A comparison of 14 sequential bathymetric surveys, from 1 to 24 m water depth, shows that the Portstewart shoreface is in equilibrium with modal to high-energy conditions; significant morphologic change is generally associated with summer and/or fair-weather conditions. Additionally, antecedent morphology appears to be a primary control on subsequent behaviour; shoreface areas that had accreted in the previous survey period were more likely to erode. Also, the high-energy shoreface and beach appears to be in a state of accretion over the survey period, which is consistent with a falling late Holocene relative sea-level, a linear and dissipative shoreface profile and an abundance of sand in the coastal system. (C) 2009 Published by Elsevier Ltd.
LanguageEnglish
Pages1361-1372
JournalContinental Shelf Research
Volume29
Issue number11-12
Early online date27 Feb 2009
DOIs
Publication statusE-pub ahead of print - 27 Feb 2009

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morphodynamics
energy
bathymetric survey
water depth
beach
accretion
Holocene
sea level
sand
coast
summer

Keywords

  • Inner shelf
  • Sediment transport
  • GIS
  • Northern Ireland
  • shoreface morphodynamics

Cite this

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abstract = "A 2-year investigation into shoreface morphodynamic behaviour off a high-energy headland-embayment coast in Northern Ireland reveals important process-response mechanisms that cannot be explained solely by existing conceptual models. A comparison of 14 sequential bathymetric surveys, from 1 to 24 m water depth, shows that the Portstewart shoreface is in equilibrium with modal to high-energy conditions; significant morphologic change is generally associated with summer and/or fair-weather conditions. Additionally, antecedent morphology appears to be a primary control on subsequent behaviour; shoreface areas that had accreted in the previous survey period were more likely to erode. Also, the high-energy shoreface and beach appears to be in a state of accretion over the survey period, which is consistent with a falling late Holocene relative sea-level, a linear and dissipative shoreface profile and an abundance of sand in the coastal system. (C) 2009 Published by Elsevier Ltd.",
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Contemporary morphodynamics of a high-energy headland-embayment shoreface. / Backstrom, Joni T.; Jackson, Derek; Cooper, Andrew.

In: Continental Shelf Research, Vol. 29, No. 11-12, 27.02.2009, p. 1361-1372.

Research output: Contribution to journalArticle

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AU - Backstrom, Joni T.

AU - Jackson, Derek

AU - Cooper, Andrew

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AB - A 2-year investigation into shoreface morphodynamic behaviour off a high-energy headland-embayment coast in Northern Ireland reveals important process-response mechanisms that cannot be explained solely by existing conceptual models. A comparison of 14 sequential bathymetric surveys, from 1 to 24 m water depth, shows that the Portstewart shoreface is in equilibrium with modal to high-energy conditions; significant morphologic change is generally associated with summer and/or fair-weather conditions. Additionally, antecedent morphology appears to be a primary control on subsequent behaviour; shoreface areas that had accreted in the previous survey period were more likely to erode. Also, the high-energy shoreface and beach appears to be in a state of accretion over the survey period, which is consistent with a falling late Holocene relative sea-level, a linear and dissipative shoreface profile and an abundance of sand in the coastal system. (C) 2009 Published by Elsevier Ltd.

KW - Inner shelf

KW - Sediment transport

KW - GIS

KW - Northern Ireland

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