Date of Award

12-14-2024

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Ocean Engineering and Marine Sciences

First Advisor

Dr. Gary Zarillo

Second Advisor

Dr. Austin L. Fox

Third Advisor

Dr. Kelli Z. Hunsucker

Fourth Advisor

Dr. Pallav Ray

Abstract

Tidal inlets interrupt longshore sediment transport, influencing adjacent beach morphology and allowing the exchange of water and sediment between the open oceans and protected back barrier bay. Inlets evolve through a combination of natural processes and are highly dynamic zones where sediment exchanges cause shifting shoreline positions nearby and create new morphological features. Barrier islands/beaches that are close in proximity to inlets evolve and are an important natural feature that dissipates wave energy and protects inland areas. Both natural and anthropogenic processes that affect barrier islands will be investigated during this study, including storm activity, waves, wind, water level, and volumetric changes. The objective of this study is to examine the relationship between metrological and morphological processes around St. Augustine Inlet. Another objective of the project is to determine a sediment budget showing the specific sources and sinks of the sediment. Lastly through the use of aerial photographs and LiDAR data in ArcGIS, the relationship between sea level and morphological processes will help to determine the long-term driver for geomorphic change. The study will test hypotheses such as whether shoreline patterns reflect historical iv trends observed in aerial photography and LiDAR analysis. Additionally, it will explore whether natural equilibrium profiles are maintained and follow typical morphodynamic patterns of barrier islands in a stable state. Findings from the study will provide critical information for effective coastal planning and engineering decisions. Stakeholders such as St. Johns County, Florida Department of Transportation (FDOT), and Anastasia State Park will benefit from understanding how meteorological and morphological factors influence adjacent beach features. This understanding is crucial for making informed decisions regarding coastal management and protection strategies. In summary, the study aims to deepen the understanding of how weather-related factors interact with coastal morphology around St. Augustine Inlet, with practical implications for managing and protecting coastal resources in the region.

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