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Video by Jeff Chao, Marisa Gaona
Long-Term Function of Coastal Islands Derived from Engineering With Nature Efforts
U.S. Army Corps of Engineers, Engineer Research and Development Center
July 28, 2021 | 11:32
Regardless of their size, islands play a critical role in providing valuable habitat, recreation opportunities, and coastal protection by reducing erosion and wave energy to nearby shorelines. Benefits are derived from the fact that islands often consist of multiple habitats that span different elevations, like beaches, dunes and marshes. These habitats in succession act as a multiple lines of defense strategy to reduce wave energy and loss of habitat. However, islands have been disappearing at an alarming rate along the Gulf of Mexico and the Atlantic coast of the United States. And as islands disappear, so do their valuable habitats and the critical protective functions they provide.

The U.S. Army Corps of Engineers has been addressing this challenge by restoring and creating islands through the beneficial use of dredged sediment, which is increasing habitats and protecting nearby shorelines. USACE’s Engineering With Nature initiative is taking island restoration one step further by partnering with its Baltimore District and multiple stakeholders for the restoration of Swan Island in the Chesapeake Bay. The Swan Island restoration provided a unique opportunity to quantify and evaluate island performance and use that data to inform future monitoring and adaptive management strategies.
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USACENOAAerosionrestorationU.S Army Corps of EngineersU.S. Army Engineer Research and Development CenterChesapeake Baybeneficial useERDCsediment placementUSFWSSea Level RiseEngineering with NatureEWNDredged sedimentSubsidenceNNBFMaryland Department of Natural ResourcesSwan IslandMartin National Wildlife Refugecoastal islandshydrodynamic modelnatural and nature-based features
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