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Miselis, J. L., USGS, St. Petersburg, FL, USA, jmiselis@usgs.gov
McNinch, J. E., USACE-ERDC-CHL-FRF, Duck, NC, USA, Jesse.McNinch@usace.army.mil
List, J. H., USGS, Woods Hole, MA, USA, jlist@usgs.gov

INTERANNUAL AND STORM-RELATED EVOLUTION OF NEARSHORE MORPHOLOGY AND ITS RELATIONSHIP TO SHORELINE BEHAVIOR

We present a time series of three-dimensional geophysical data collected over a two-year period contrasting two nearshore regions, one with shore-parallel bars and homogenous sediments and another with shore-oblique bars and heterogeneous sediments. High-resolution shoreline behavior data are compared to geophysical observations including swath bathymetry, backscatter and high-resolution seismic reflection data. Observed nearshore behavior is highly spatially variable, even between sites with similar nearshore bar morphology. Nearshore sediment thickness and bar morphology are related to the magnitude of interannual nearshore variability and the cross-shore extent of morphologic variability, respectively. Additionally, interannual nearshore and shoreline evolution is more dynamic in regions with shore-oblique bars than in regions with shore-parallel bars, which is likely related to high variability in cross-shore profile slope over small longshore distances. Observations for specific storm periods suggest that extratropical storms and spatial variation in seafloor sediment act to preserve shore-oblique bars and troughs, whereas tropical storms tend to diminish the morphology. Analyses of datasets like this one provide unprecedented insight to the complexity and interconnectedness of nearshore and shoreline morphological evolution.

Session #:015
Date: 2/24/2012
Time: 14:30
Location: Ballroom I

Presentation is given by student: No