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

By: , and 
Edited by: Julie D. RosatiPing Wang, and Tiffany M. Roberts

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Abstract

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.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Inner shelf morphologic controls on the dynamics of the beach and bar system, Fire Island, New York
ISBN 978-981-4355-52-0
DOI 10.1142/9789814355537_0078
Year Published 2011
Language English
Publisher World Scientific
Contributing office(s) Woods Hole Coastal and Marine Science Center
Description 14 p.
Larger Work Type Book
Larger Work Subtype Monograph
Larger Work Title The proceedings of the Coastal Sediments 2011
First page 1034
Last page 1047
Conference Title Coastal Sediments 2011
Conference Location Miami, FL
Conference Date May 2-6, 2011
Country United States
State New York
Other Geospatial Fire Island
Online Only (Y/N) N
Additional Online Files (Y/N) N