Historical Shoreline Change Analysis: A Case Study on the Town of Jupiter, Florida

Authors: Ty C Briggs*, Florida Atlantic University, Tiffany Roberts Briggs, Florida Atlantic University
Topics: Coastal and Marine, Geographic Information Science and Systems, Sustainability Science
Keywords: GIS, Shoreline Dynamics, Hard Engineering, transects,
Session Type: Paper
Day: 4/4/2019
Start / End Time: 3:05 PM / 4:45 PM
Room: Taylor, Marriott, Mezzanine Level
Presentation File: No File Uploaded

Prior to structural hardening, the Jupiter Inlet was at times several hundred yards south of the present location (DuBois, 1968). Subsequently, engineering practices have substantially altered the geomorphological function of the Loxahatchee River which terminates through the Jupiter Inlet. This study aims to evaluate geomorphic changes along the inlet-adjacent beaches, including a brief summary of the cultural and engineering activities potentially influencing sediment transport patterns. Due to changes in the tidal prism and stability of the inlet opening and location, the Jupiter Inlet system was placed on a regular inlet dredging maintenance schedule by the Jupiter Inlet District in 1947. Many of the channels along the Loxahatchee River have since been lined by long rock revetments as a means of maintaining channelized flow and preventing unwanted accumulation of sediment in the channels. As a result of the river’s historical changes, the Jupiter inlet’s adjacent coastline has experienced altered water circulation patterns, longshore currents, and littoral drift. This study will present the results of 1) historical changes in shorelines adjacent to the Jupiter inlet; 2) classification of accretion and erosion patterns along adjacent beaches; and 3) evaluation of the potential human influences on the changes identified, such as beach nourishment and other engineering activities. Shoreline change rates are measured using georeferenced maps and aerial imagery in GIS. These maps also aid in visually determining potential human influences (e.g., installation or maintenance of hard structures), with supplemental cultural and anecdotal information gathered from the available literature.

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