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Scaling coastal dune elevation changes across storm-impact regimes

April 25, 2014

Extreme storms drive change in coastal areas, including destruction of dune systems that protect coastal populations. Data from four extreme storms impacting four geomorphically diverse barrier islands are used to quantify dune elevation change. This change is compared to storm characteristics to identify variability in dune response, improve understanding of morphological interactions, and provide estimates of scaling parameters applicable for future prediction. Locations where total water levels did not exceed the dune crest experienced elevation change of less than 10%. Regions where wave-induced water levels exceeded the dune crest exhibited a positive linear relationship between the height of water over the dune and the dune elevation change. In contrast, a negative relationship was observed when surge exceeded the dune crest. Results indicate that maximum dune elevation, and therefore future vulnerability, may be more impacted from lower total water levels where waves drive sediment over the dune rather than surge-dominated flooding events.

Publication Year 2014
Title Scaling coastal dune elevation changes across storm-impact regimes
DOI 10.1002/2014GL059616
Authors Joseph W. Long, Anouk T. M. de Bakker, Nathaniel G. Plant
Publication Type Article
Publication Subtype Journal Article
Series Title Geophysical Research Letters
Index ID 70102838
Record Source USGS Publications Warehouse
USGS Organization St. Petersburg Coastal and Marine Science Center