Schematic of proposed barrier island subsidence sampling and monitorin

Schematic of proposed barrier island subsidence sampling and monitoring set up. Primary procedure: 1) install 1st order benchmarks to monitor surface elevation (subsidence) across barrier island; 2) collect topography and bathymetry data (including inlets at each end) to compare with archived data and elevations; 3) collect auger cores (~10 to 20 meter deep) for stratigraphy; 4) install extensometers to monitor compaction following core collection; and 5) collect short cores as proof-of-concept identifying subsidence versus erosion by comparing short-and long-lived isotopes (⁷Be/²³⁴Th, ²¹⁰Pb/¹³⁷Cs, and Rad⁷).