Decoupling processes and scales of shoreline morphodynamics
Plant, Nathaniel G.
Henderson, Rachel E.
Schwab, William C.
Nelson, Timothy R.
MetadataShow full item record
KeywordShoreline change; Coastal evolution; Storm response; Empirical orthogonal function; Fire Island
Behavior of coastal systems on time scales ranging from single storm events to years and decades is controlled by both small-scale sediment transport processes and large-scale geologic, oceanographic, and morphologic processes. Improved understanding of coastal behavior at multiple time scales is required for refining models that predict potential erosion hazards and for coastal management planning and decision-making. Here we investigate the primary controls on shoreline response along a geologically-variable barrier island on time scales resolving extreme storms and decadal variations over a period of nearly one century. An empirical orthogonal function analysis is applied to a time series of shoreline positions at Fire Island, NY to identify patterns of shoreline variance along the length of the island. We establish that there are separable patterns of shoreline behavior that represent response to oceanographic forcing as well as patterns that are not explained by this forcing. The dominant shoreline behavior occurs over large length scales in the form of alternating episodes of shoreline retreat and advance, presumably in response to storms cycles. Two secondary responses include long-term response that is correlated to known geologic variations of the island and the other reflects geomorphic patterns with medium length scale. Our study also includes the response to Hurricane Sandy and a period of post-storm recovery. It was expected that the impacts from Hurricane Sandy would disrupt long-term trends and spatial patterns. We found that the response to Sandy at Fire Island is not notable or distinguishable from several other large storms of the prior decade.
This paper is not subject to U.S. copyright. The definitive version was published in Marine Geology 381 (2016): 42–53, doi:10.1016/j.margeo.2016.08.008.
Showing items related by title, author, creator and subject.
Jin, Di; Hoagland, Porter; Au, Donna K.; Qiu, Jun (2015-06-16)We investigate the effects of shoreline change and protective structures (seawalls) on home values, using data on residences sold between 2000 and 2010 in the coastal towns of Marshfield, Duxbury, and Plymouth, Massachusetts. ...
High-angle wave instability and emergent shoreline shapes : 1. Modeling of sand waves, flying spits, and capes Ashton, Andrew D.; Murray, A. Brad (American Geophysical Union, 2006-12-15)Contrary to traditional findings, the deepwater angle of wave approach strongly affects plan view coastal evolution, giving rise to an antidiffusional “high wave angle” instability for sufficiently oblique deepwater waves ...
High-angle wave instability and emergent shoreline shapes : 2. Wave climate analysis and comparisons to nature Ashton, Andrew D.; Murray, A. Brad (American Geophysical Union, 2006-12-15)Recent research has revealed that the plan view evolution of a coast due to gradients in alongshore sediment transport is highly dependant upon the angles at which waves approach the shore, giving rise to an instability ...