Fisher Island Summary & Conclusions

• No pre-construction survey was performed for this project.  Because of this, shoreline and volume changes refer to changes made since post-construction. Volume Remaining percentile (%) calculated using the reported "volume placed" (found in the Design Parameters).

• For the 4-year period following commencement of construction of the Fisher Island beach restoration project, the project volume has been stable both above and below the water line.  Three and a half years after project completion, the in-place volume is within 1% of the original project volume.  There has been no significant re-distribution of the beach fill along the shoreline; i.e., the project's seven stabilizing structures have resulted in the establishment of a generally steady shoreline geometry.   Likewise, overall shoreline location and beach planform area have remained stable.
• The population of "native", non-aragonite sediment in the beach fill is steadily increasing along the northern half of the project.  In contrast, beach sediment along the southern half of the project is still strongly dominated by imported, oolitic aragonite.
• With the exception of some temporary profile flattening caused by Hurricane Andrew, the beach slope has remained stable at its predicted value of about 1:10.  There have been no significant changes in the project's grain size distributions, although there has been variability (with no trend) between surveys.  Grain sizes are notably sorted across the profile.  The varying presence of native sand and shell significantly influences the grain size distributions.  Effects of potential cementation, dissolution or abrasion of the aragonite fill have not been observed.  The aragonite has not been observed to act as a souce of turbidity.