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Scour Hole Development and Stabilization at Shinnecock and Moriches Inlets, New York

by Yen-hsi Chu, Coastal Engineering Research Cent, Vicksburg, United States,
Gilbert K. Nersesian, Coastal Engineering Research Cent, Vicksburg, United States,



Document Type: Proceeding Paper

Part of: Coastal Engineering Practice

Abstract:

A scour hole developed inside the Shinnecock Inlet channel near the tip of the west jetty. Over the years, this hole deepened to about 70 ft below the mean low water level with the average channel depth at the inlet throat approximately 20 ft. A similar situation occurred at Moriches Inlet, 15 miles west of Shinnecock Inlet, where a scour hole about 50 ft deep developed at the ocean end of the west jetty. Both holes contributed to the failure of the jetties with the head sections collapsing into the holes. An attempt to remedy the situation by filling the hole at Shinnecock Inlet with dredged material did not yield satisfactory results. The New York District developed a plan using a riprap scour blanket to stabilize the scour hole area. A field study of tidal current distribution at the inlet vicinity and a review of the history of scour hole development were performed for better understanding of the inlet hydrodynamics in relation to the scour hole formation.

Subject Headings: Inlets (waterway) | Scour | Tides | Jetties | Coastal protection structures | Water supply systems | Transportation engineering | New York | United States

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