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Modeling Holocene coastal erosion and sediment supply in the western North Sea

John G. Rees, Rhonda Newsham and Christopher D. R. Evans
Modeling Holocene coastal erosion and sediment supply in the western North Sea (in Coastline changes; interrelation of climate and geological processes, Jan Harff (editor), William Hay (editor) and Daniel M. Tetzlaff (editor))
Special Paper - Geological Society of America (2007) 426: 159-170

Abstract

Estimating postglacial coastal sediment budgets is difficult as erosion has removed the landscape drowned by marine transgression and coastal positions through time are rarely known. In the Natural Environment Research Council (NERC)-funded Land Ocean Interaction Study, a model was built, based on detailed characterization of onshore-offshore bathymetric profiles (created by Holocene wave-base migration). Modeling of the pre-Holocene western North Sea land surface (west of 1 degrees E and south of 54 degrees N) and sea-level curves allow determination of the likely position of wave base and coast at any time during the late Holocene. The volumes of materials eroded from cliffs, wave action on the shoreface, and tidal scour associated with erosion of pits (e.g., Inner Silver Pit) from different coastal areas have been estimated. The average annual contribution of sediment per meter length of coast is higher than some recent erosion rates would suggest, but appears consistent with the volumetric difference between the modeled end-Pleistocene surface and the present topographic-bathymetric surface. With other models, outputs would suggest that less than 5% of the Humber Holocene is likely to be of fluvial origin-a percentage corroborated by detailed geochemical and mineralogical provenance studies of the estuarine fill. The model suggests that more sediment has been released from the shoreface than from cliffs per unit length of coastline throughout the Holocene; this is an important finding for coastal managers, as this pattern is likely to continue and because the shore-face cannot be effectively protected from erosion.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 426
Title: Modeling Holocene coastal erosion and sediment supply in the western North Sea
Title: Coastline changes; interrelation of climate and geological processes
Author(s): Rees, John G.Newsham, RhondaEvans, Christopher D. R.
Author(s): Harff, Janeditor
Author(s): Hay, Williameditor
Author(s): Tetzlaff, Daniel M.editor
Affiliation: British Geological Survey, Nottingham, United Kingdom
Affiliation: Baltic Sea Research Institute, Rostock, Federal Republic of Germany
Pages: 159-170
Published: 2007
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 978-0-8137-2426-3
Meeting name: 32nd international geological congress
Meeting location: Florence, ITA, Italy
Meeting date: 20040820Aug. 20-28, 2004
References: 9
Accession Number: 2008-044809
Categories: Quaternary geology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., 5 tables, sketch maps
N53°30'00" - N53°45'00", W00°52'00" - E00°07'60"
Secondary Affiliation: Schlumberger Information Solutions, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200813
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