Surficial beach structures formed by wave-generated foam

Research output: Contribution to journalArticle

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Abstract

In this article, we report on the modification of an intertidal beach surface by processes connected with the generation and redistribution of foam during a coastal storm. Foam generated by breaking waves initially accumulated at the swash line but was reworked across the beach by onshore winds. A distinctive suite of sedimentary structures, capable of preservation in the geological record, was produced that displayed a distinctive cross-shore arrangement from the zone of foam generation to the zone of foam deposition and also varied according to tidal level and wind speed. Foam marks with wind-transverse linear elements characterized the upper sections of the beach. Other distinctive features formed during this storm include foam swash lines, wind-parallel foam stripes, mud drapes, and sand drapes on the upper beach and supratidal zone. These features formed a surface veneer on a high-energy dissipative beach; their formation began during a high tide and continued during the subsequent falling tide. During the later stages of the falling tide, still-forming foam-driven features were in places being modified by (and themselves modifying) surface features characteristic of late-stage emergence runoff (e.g., double-crested ripples, rill marks, microdeltas).
LanguageEnglish
Pages780-788
JournalJournal of Geology
Volume109
Issue number6
Publication statusPublished - Nov 2001

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foam
beach
wave runup
tide
rill
breaking wave
ripple
sedimentary structure
geological record
mud
wind velocity
runoff
sand
energy

Cite this

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title = "Surficial beach structures formed by wave-generated foam",
abstract = "In this article, we report on the modification of an intertidal beach surface by processes connected with the generation and redistribution of foam during a coastal storm. Foam generated by breaking waves initially accumulated at the swash line but was reworked across the beach by onshore winds. A distinctive suite of sedimentary structures, capable of preservation in the geological record, was produced that displayed a distinctive cross-shore arrangement from the zone of foam generation to the zone of foam deposition and also varied according to tidal level and wind speed. Foam marks with wind-transverse linear elements characterized the upper sections of the beach. Other distinctive features formed during this storm include foam swash lines, wind-parallel foam stripes, mud drapes, and sand drapes on the upper beach and supratidal zone. These features formed a surface veneer on a high-energy dissipative beach; their formation began during a high tide and continued during the subsequent falling tide. During the later stages of the falling tide, still-forming foam-driven features were in places being modified by (and themselves modifying) surface features characteristic of late-stage emergence runoff (e.g., double-crested ripples, rill marks, microdeltas).",
author = "Andrew Cooper and Derek Jackson",
year = "2001",
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language = "English",
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}

Surficial beach structures formed by wave-generated foam. / Cooper, Andrew; Jackson, Derek.

In: Journal of Geology, Vol. 109, No. 6, 11.2001, p. 780-788.

Research output: Contribution to journalArticle

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AB - In this article, we report on the modification of an intertidal beach surface by processes connected with the generation and redistribution of foam during a coastal storm. Foam generated by breaking waves initially accumulated at the swash line but was reworked across the beach by onshore winds. A distinctive suite of sedimentary structures, capable of preservation in the geological record, was produced that displayed a distinctive cross-shore arrangement from the zone of foam generation to the zone of foam deposition and also varied according to tidal level and wind speed. Foam marks with wind-transverse linear elements characterized the upper sections of the beach. Other distinctive features formed during this storm include foam swash lines, wind-parallel foam stripes, mud drapes, and sand drapes on the upper beach and supratidal zone. These features formed a surface veneer on a high-energy dissipative beach; their formation began during a high tide and continued during the subsequent falling tide. During the later stages of the falling tide, still-forming foam-driven features were in places being modified by (and themselves modifying) surface features characteristic of late-stage emergence runoff (e.g., double-crested ripples, rill marks, microdeltas).

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