Clemmensen, Lars B

Hede, Mikkel Ulfeldt

Kroon, Aart

Nielsen, Lars

Pejrup, Morten

Sander, Lasse

English

Copenhagen University Research Information System

u n i ve r s i t y  o f  co pe n h ag e n  Københavns UniversitetChanges in relative sea-level and coastal morphology during the last 5000 yearsHede, Mikkel Ulfeldt; Sander, Lasse; Clemmensen, Lars B; Kroon, Aart; Pejrup, Morten;Nielsen, LarsPublished in:Geophysical Research AbstractsPublication date:2015Document versionEarly version, also known as pre-printCitation for published version (APA):Hede, M. U., Sander, L., Clemmensen, L. B., Kroon, A., Pejrup, M., & Nielsen, L. (2015). Changes in relativesea-level and coastal morphology during the last 5000 years: a case study from the island of Samsø, Denmark.Geophysical Research Abstracts, 17, [10456].Download date: 03. Feb. 2020Geophysical Research AbstractsVol. 17, EGU2015-10456, 2015EGU General Assembly 2015© Author(s) 2015. CC Attribution 3.0 License.Changes in relative sea-level and coastal morphology during the last 5000years – a case study from the island of Samsø, DenmarkMikkel Ulfeldt Hede (1), Lasse Sander (1,2), Lars B Clemmensen (1), Aart Kroon (1), Morten Pejrup (1), andLars Nielsen (1)(1) University of Copenhagen, Department of Geosciences and Natural Resource Management, DK-1350 Copenhagen K,Denmark, (2) Geological Survey of Denmark and Greenland (GEUS), DK-1350 Copenhagen K, DenmarkChanges in relative sea-level (RSL) during the mid- to late Holocene are reconstructed based on internal beachridge geometry imaged by ground-penetrating radar. Data were collected across a raised beach-ridge system on theisland of Samsø, Denmark. The internal architecture of the beach-ridge system is divided into characteristic radarfacies. We identify downlap points interpreted to mark the transition from the beachface to the upper shoreface,which we assume to represent actual sea-level at the time of deposition.The absolute vertical level of the identified downlap points are combined with an age-distance model based onoptically stimulated luminescence dated samples to construct a RSL curve for the past c. 5000 years. To ourknowledge, this is the longest RSL reconstruction based on this proxy.The dataset shows that the period between c. 4800–3800 yr BP was characterized by relatively high RSL valuesof c. 2.3 m above mean sea level. A marked decrease in RSL of c. 1.3 m occurred between c. 3800–3600 yr BP ata rate of c. 5 mm/yr. After c. 3500 yr BP the RSL curve shows a gradually decrease at a rate of c. 0.6 mm/yr.This new data set further revealed reflections interpreted as beach steps. In combination with estimated changes indip values of interpreted beachface reflectors, these observations may provide information about changes in themorphodynamic conditions of beach-ridge construction and progradation through time.

Changes in relative sea-level and coastal morphology during the last 5000 years:a case study from the island of Samsø, Denmark

https://curis.ku.dk/portal/files/146384292/EGU2015_10456.pdf

Changes in relative sea-level and coastal morphology during the last 5000 years:a case study from the island of Samsø, Denmark

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