Masonboro Island

Project Sheet

Location: New Hanover County, Wilmington, NC, US

Year: 2000

Project Type(s): Marsh restoration

Project Description: The purpose of this project was to investigate the effects of placing dredged material on the surface of a back barrier tidal salt marsh located in Masonbro Island, NC, where sediment accretion is insufficient to maintain elevation in equilibrium with sea level rise. A pilot scale study was conducted in a 1,800 ft^2 area consisting of 2 non-deteriorated and 2 deteriorated sites of 450 ft2 each. Approximately 11 CY of dredged material were placed during high tide at depths varying gradually from 0 to 10 m across each site, to reduce adverse effects on vegetation, simulate slurry disposal, and promote uniform distribution. Monitoring of thin layer thickness, plant density, benthic community assemblage and abundance, and oxidation reduction potential was conducted every other month for approximately a year.