Abstract
In support of studies and assessments of barrier island evolution in the Gulf of Mexico, rates of shoreline change for Dauphin Island, Alabama were generated for three analysis periods, using two different shoreline proxy datasets. Mean High Water line (MHW) shorelines were generated from 14 lidar datasets from 1998 to 2014, and Wet Dry Line (WDL) shorelines were digitized from ten sets of georeferenced aerial images from 1940 to 2015. Rates of change for the open ocean (south-facing) and back-barrier (north-facing) coast were generated for three groups of shorelines: MHW (lidar), WDL (aerial) and MHW and WDL shorelines combined. Calculations were performed using the Digital Shoreline Analysis System (DSAS) version 4.2, an ArcGIS extension developed by the U.S. Geological Survey (Thieler et al, 2005).
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