The Outer Banks of North Carolina: Budget of Sediment and Inlet Dynamics Along a Migrating Barrier System

摘要: The Outer Banks are barrier islands separating Pamlico, Albemarle and Currituck Sounds from the Atlantic Ocean. These barriers transgressing landward, with average rates of shoreline recession 1.4 m/yr between False Cape Hatteras. Oregon Inlet, 63 km north Hatteras, is only opening in nearly 200 Henry Hatteras which bounds Littoral Cell. Inlet migrating south at an Tate 23 landward a rate 5 m/yr. net southerly longshore transport sand vicinity one-half one million m3/yr. most dynamic physical feature within combination waves tidal currents deposit ebb-tide bars offshore entrance form extensive islands, shoals Pamlico Sound. deposits lag behind as inlet migrates. gradually returned to beach by reincorporated into littoral drift system. flood-tide sound eventually moves south. integrity side maintained washover deposits, windblown deposits. Averaged over 160 sea-level rise accounts for 21% measured Analysis budget sediment indicates that remaining erosion 1.1 apportioned overwash processes (39%), out cell (22%), (18%), (10%), removal dredging (11%). This analysis system whole, so balance relative moving (Lagrangian grid). Application continuity model suggests that, places, supplied shelf.