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Data from five series of movable bed laboratory experiments are presented herein. These experiments were conducted in the Largescale Sediment Transport Facility at the U.S. Army Engineer Research and Development Center, Vicksburg, MS. The data collected from these experiments are being used to improve longshore sand transport relationships under the combined influence of waves and currents and the enhancement of predictive numerical models of beach morphology evolution, in particular, with respect to modeling of tombolo development at detached breakwates and T-groins. These data were instrumental in the development and validation of GENESIS-T (Hanson et al. 2006) an enhanced version of GENESIS that allows for continued simulation of shoreline evolution after tombolo formation at detached breakwaters.To obtain the data sets collected in these experiments contact Mark B. Gravens (Mark.B.Gravens@erdc.usace.army.mil) or 601-634-3809.

Abstract:The presence of shoreline undulations along the Atlantic coast of Fire Island, NY requires careful consideration in developing erosion control and hurricane protection plans and design alternatives for the protection of the Fire Island barrier and the Long Island mainland. An analysis and geometric characterization of these morphologic shoreline features revealed that the magnitude of the shoreline undulations approximates typical protective berm design widths and exceeds typical advance nourishment beach widths. Because shoreline undulations are natural morphologic features of the Fire Island shoreline their presence after project construction must be anticipated. Conclusions drawn from the analysis of the Fire Island shoreline undulations indicate that the design berm width could be compromised well before scheduled renourishment if explicit consideration of shoreline undulations is not included in the development of the design cross-section.