Extracting storm-surge data from coastal dunes for improved assessment of flood risk

Alastair C. Cunningham*, Marcel A.J. Bakker, Sytze Van Heteren, Bert Van Der Valk, Ad J.F. Van Der Spek, Dennis R. Schaart, Jakob Wallinga

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

48 Citations (Scopus)

Abstract

Future changes in climate and sea level are likely to increase the threat from storm surges in many coastal regions. Mitigation of this threat requires an understanding of storm surge magnitude and frequency, and the relationship of these variables to climate parameters. This understanding is currently limited by the brevity of instrumental records, which rarely predate the twentieth century. However, evidence of former storm surges can be recorded in coastal dunes, because the dune topography may trap high-magnitude deposits at elevated locations. Here we combine a range of techniques to extract storm-surge data from coastal dune sediment. The sediment is tracked in the subsurface with ground-penetrating radar to assess its height and extent, and its age is determined with good precision through optically stimulated luminescence dating. The probable age of the sediment (A.D. 1775 or 1776) is within a period of increased storminess in northwest Europe, and the local magnitude of the event is likely to be greater than any on instrumental record. By utilizing coastal dunes for storm surge analysis, our approach provides a valuable new source of information for understanding storm surge risk, which is vital for the protection of coastal regions.

Original languageEnglish
Pages (from-to)1063-1066
Number of pages4
JournalGeology
Volume39
Issue number11
DOIs
Publication statusPublished - 1 Nov 2011
Externally publishedYes

Fingerprint Dive into the research topics of 'Extracting storm-surge data from coastal dunes for improved assessment of flood risk'. Together they form a unique fingerprint.

Cite this