Storm swash terraces: a previously overlooked element of the cliff-shore platform system

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Storm swash terraces are a distinctive and previously unreported component of the cliff-shore platform sedimentary system. They consist of laminated marine sands and gravels with occasional large, rounded clasts and fine muddy laminae. The planar deposits dip gently seaward, are up to 1 m thick at the seaward margin, and thin landwards, forming a wedge. They are laterally continuous over tens of meters in a coast-parallel dimension. They occur in coastal re-entrants at the rear of boulder beaches and shore platforms at elevations between 1 and 9 m above contemporary high-tide level. The terrace sediments represent deposition at the limit of wave run-up during extreme storms; during such events wave energy is largely dissipated by a shore platform and/or boulder beach but sufficient energy remains to carry water and fine sediment to higher levels, where it then accumulates. The deposition and preservation of storm swash terraces depend on a coastal topography that combines partial wave-energy dissipation on a shore platform or boulder beach with available depositional space to landwards. These deposits contain a sedimentary record of past storminess on high-energy coasts that has yet to be exploited.
LanguageEnglish
Pages260-269
JournalJournal of Sedimentary Research
Volume82
DOIs
Publication statusPublished - Apr 2012

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shore platform
wave runup
cliff
terrace
boulder
beach
wave energy
coast
energy dissipation
sand and gravel
clast
sediment
energy
tide
topography
water

Cite this

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title = "Storm swash terraces: a previously overlooked element of the cliff-shore platform system",
abstract = "Storm swash terraces are a distinctive and previously unreported component of the cliff-shore platform sedimentary system. They consist of laminated marine sands and gravels with occasional large, rounded clasts and fine muddy laminae. The planar deposits dip gently seaward, are up to 1 m thick at the seaward margin, and thin landwards, forming a wedge. They are laterally continuous over tens of meters in a coast-parallel dimension. They occur in coastal re-entrants at the rear of boulder beaches and shore platforms at elevations between 1 and 9 m above contemporary high-tide level. The terrace sediments represent deposition at the limit of wave run-up during extreme storms; during such events wave energy is largely dissipated by a shore platform and/or boulder beach but sufficient energy remains to carry water and fine sediment to higher levels, where it then accumulates. The deposition and preservation of storm swash terraces depend on a coastal topography that combines partial wave-energy dissipation on a shore platform or boulder beach with available depositional space to landwards. These deposits contain a sedimentary record of past storminess on high-energy coasts that has yet to be exploited.",
author = "John McKenna and Andrew Cooper and Derek Jackson",
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Storm swash terraces: a previously overlooked element of the cliff-shore platform system. / McKenna, John; Cooper, Andrew; Jackson, Derek.

In: Journal of Sedimentary Research, Vol. 82, 04.2012, p. 260-269.

Research output: Contribution to journalArticle

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AU - McKenna, John

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N2 - Storm swash terraces are a distinctive and previously unreported component of the cliff-shore platform sedimentary system. They consist of laminated marine sands and gravels with occasional large, rounded clasts and fine muddy laminae. The planar deposits dip gently seaward, are up to 1 m thick at the seaward margin, and thin landwards, forming a wedge. They are laterally continuous over tens of meters in a coast-parallel dimension. They occur in coastal re-entrants at the rear of boulder beaches and shore platforms at elevations between 1 and 9 m above contemporary high-tide level. The terrace sediments represent deposition at the limit of wave run-up during extreme storms; during such events wave energy is largely dissipated by a shore platform and/or boulder beach but sufficient energy remains to carry water and fine sediment to higher levels, where it then accumulates. The deposition and preservation of storm swash terraces depend on a coastal topography that combines partial wave-energy dissipation on a shore platform or boulder beach with available depositional space to landwards. These deposits contain a sedimentary record of past storminess on high-energy coasts that has yet to be exploited.

AB - Storm swash terraces are a distinctive and previously unreported component of the cliff-shore platform sedimentary system. They consist of laminated marine sands and gravels with occasional large, rounded clasts and fine muddy laminae. The planar deposits dip gently seaward, are up to 1 m thick at the seaward margin, and thin landwards, forming a wedge. They are laterally continuous over tens of meters in a coast-parallel dimension. They occur in coastal re-entrants at the rear of boulder beaches and shore platforms at elevations between 1 and 9 m above contemporary high-tide level. The terrace sediments represent deposition at the limit of wave run-up during extreme storms; during such events wave energy is largely dissipated by a shore platform and/or boulder beach but sufficient energy remains to carry water and fine sediment to higher levels, where it then accumulates. The deposition and preservation of storm swash terraces depend on a coastal topography that combines partial wave-energy dissipation on a shore platform or boulder beach with available depositional space to landwards. These deposits contain a sedimentary record of past storminess on high-energy coasts that has yet to be exploited.

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