Shinnecock Inlet, New York, Site Investigation Report 1 Morphology and Historical Behavior

摘要

Shinnecock Inlet is the easternmost of six permanent inlets in the barrier island chain that follows Long Island's south shore. Shinnecock Inlet is located in eastern Long Island in Suffolk County, near the town of Southampton, and connects the Atlantic Ocean to Shinnecock Bay. The inlet was formed during the Great New England Hurricane of 21 September 1938, when high waves and a storm surge overwashed the barrier. The morphologic history of the inlet can be divided into three phases: (a) 1938 to 1939 - breach and natural inlet; (I) 1939 to 1951 - inlet stabilized on the west wide only with a stone and timber revetment; (c) 1952 to present - inlet stabilized in its present location with stone jetties. Since 1939, an oval-shaped ebb shoal has grown out into the Atlantic Ocean. The total volume of sand that accumulated in the shoal between 1938 and 1998 was 8,453,000 yd , representing an average growth rate of 141,000 yd3/year. In contrast, the flood shoal has lost sand since 1938, largely as a result of dredging the navigation channels in the back bay. After the jetties were built in 1952, the thalweg has been stable. The minimum cross section, 1, 6000 m2 (17,000 ft2), occurs about 150 m north of the tip of the east jetty.