Project Type(s): Historical dredged material placement / Marsh restoration
Project Description: The objective of this project was to evaluate physical and environmental effects of dredge material placed 9 years earlier in two different marsh areas located in Gull Rock, NC. Approximately 10,000 to 20,000 CY of dredged material consisting of clay, silt, and fine sand were sprayed on one site with a 6-in. pipeline that split to feed two 3-in. independent discharge nozzles. Sediment layer thickness ranged from 0.4 to 4 in., with an average thickness of about 2 in. Additional material was sprayed on a 2nd site site in a thin layer ranging from 0.4 to 8 in., with an average thickness of approximately 4 in. Nine years after thin layer placement, the canal and marsh site were assessed to capture the long-term effects of the placement activities.