MORPHOLOGICAL IMPACTS OF HURRICANES FRANCES AND JEANNE (2004) ON NOURISHED FLORIDA BEACHES

摘要

Post-storm field inspections and surveys were conducted on two nourished beaches (Boca Raton and Town of Palm Beach) to determine morphological impacts of H. Frances and H. Jeanne on these beaches. As a general trend, the expected cross-shore response (beach cut and offshore bar formation) was observed. Alongshore variability of profile response and erosion rates and hot spot development (due to variable causes) were also observed, these may be attributed to a number of factors including irregular offshore bathymetry, presence of surf zone rock outcrops and irregular (curved) nourishment planform. Erosion of the project templates ranged from 24% to 37.5% of the original placed volume in Town of Palm Beach and Boca Raton respectively. Beach nourishment performance is summarized in this paper and hypothesis to explain the observed beach behavior are presented.