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Inner shelf morphologic controls on the dynamics of the beach and bar system, Fire Island, New York

May 2, 2011
The mechanism of sediment exchange between offshore sand ridges and the beach at Fire Island, New York is largely unknown. However, recent evidence from repeat nearshore bathymetry surveys, coupled with the complex but consistent bar morphology and patterns of shoreline change demonstrate that there is a feedback occurring between the regional geologic framework and modern processes. Analysis of bathymetric survey data provides direct confirmation that the offshore ridges are connected to the shoreface and are spatially persistent. The fixed nature of the nearshore morphology is further supported by time series camera data that indicate persistent bars with breaks that re-form in the same locations. A long-term time series of shoreline change shows distinct zones of erosion and accretion that are pervasive over time scales greater than a half-century, and their length-scales are similar to the spacing of the offshore ridge-trough system. The first-order geologic framework is responsible for the existence and locations of the ridges and troughs, which then influence the morphodynamics of the beach and bar system.

Citation Information

Publication Year 2011
Title Inner shelf morphologic controls on the dynamics of the beach and bar system, Fire Island, New York
DOI 10.1142/9789814355537_0078
Authors Cheryl J. Hapke, William C. Schwab, Paul T. Gayes, Clay McCoy, Richard Viso, Erika E. Lentz
Publication Type Conference Paper
Publication Subtype Conference Paper
Series Title
Series Number
Index ID 70041586
Record Source USGS Publications Warehouse
USGS Organization Woods Hole Coastal and Marine Science Center