|The beaches of South Amelia Island were nourished in 1994 and 2002 using sand dredged from two offshore borrow area located in close proximity to one another along the ebb tidal shoal of Nassau Sound. The borrow areas for both projects were designed and permitted on behalf of the South Amelia Island Shoreline Stabilization Association (SAISSA).
The second project included the Florida Park Service as co-permittee. In support of future renourishment efforts, the present investigation seeks to quantify the quality and volume of sand remaining within the limits of the partially excavated 2002 borrow site, as well as, explore the sediments outside of the existing borrow areas for potential borrow area expansion. In order to characterize the native beach for compatibility with identified offshore sand sources, sediment samples along and immediately offshore of Amelia Island beaches were collected and analyzed.
In support of the current geotechnical investigation, Alpine Ocean Seismic Survey, Inc was contracted to acquire fifty-three Vibracore samples in and around the existing borrow area limits. Vibracore collection was completed between July and October 2007 and was supervised by a registered professional engineer with Olsen Associates, Inc. Following collection, cores were logged in order to describe the various geologic strata present. Physical samples were then collected and analyzed for grain size distribution and carbonate content. This work was completed by an independent laboratory under the supervision of a registered professional geologist.
Based on available survey and geotechnical data, a theoretical maximum volume of about 9.5 Mcy of beach-compatible material were identified by this study. The general characterization of this material closely approximates that which was placed onto Amelia Island in 1994 and 2002.
Future physical performance of this fill material is expected to similar to that placed in 2002. See links below for more information.