Inlet-adjacent beach and shoreline variability at decadal scales

Abstract

Beaches provide storm protection and economic benefit for coastal communities and also host important habitats for keystone species, especially in the state of Florida. However, sea level rise, coastal construction, and intensifying storms are resulting in coastal erosion, which often requires informed mitigation and management strategies. This study aims to explore decadal-scale trends in morphology change and shoreline variability of inlet-adjacent beaches in Jupiter, Florida. Data from three locations over a period of three decades were analyzed to determine volumetric and contour changes above the shoreline (0 m elevation) and across the entire profile. The largest variability in decadal morphology change was measured at beaches closest to Jupiter Inlet. Substantial shoreline and beach changes were also associated with periods of higher storm activity. Variability in storm events, nourishment trends, and longshore sediment transport also influenced decadal morphologic change. To best adapt to coastal change and develop comprehensive beach-inlet management plans, it is imperative to understand past trends of shoreline variability and beach-nearshore erosion and accretion patterns. Results of this study demonstrate an approach to elucidate decadal patterns in morphology changes and drivers of change.