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

Author:

Publisher:

Published: 1999

Total Pages: 0

ISBN-13:

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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.

Shinnecock Inlet, New York, Site Investigation. Report 2: Evaluation of Sand Bypass Options
Shinnecock Inlet, New York, Site Investigation. Report 2: Evaluation of Sand Bypass Options

Author: Gregory Williams

Publisher:

Published: 1998

Total Pages: 153

ISBN-13:

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The U.S. Army Engineer District, New York, is conducting several shore protection studies along the south shore of Long Island, New York. Shinnecock Inlet is the easternmost of six openings in the barrier island chain that runs along the south shore of Long Island and the inlet falls within the largest shore protection effort, the "Fire Island to Montauk Point Reformulation Study (FIMPRS)." Under FIMPRS, coastal processes, shore protection, and flood damage reduction alternatives are being examined from Fire Island Inlet eastward to Montauk Point. This report discusses the geologic history of the inlet and using the results of a coastal processes study, evaluates ebb shoal morphology and longshore transport processes as they relate to sand management (bypass) options. Five bypass options are evaluated based on cost, operational effectiveness, and sand source location. A decision matrix is included to compare alternatives.

Shinnecock Inlet, New York, Site Investigation Report 4, Evaluation of Flood and Ebb Shoal Sediment Source Alternatives for the West of Shinnecock Interim Project, New York
Shinnecock Inlet, New York, Site Investigation Report 4, Evaluation of Flood and Ebb Shoal Sediment Source Alternatives for the West of Shinnecock Interim Project, New York

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Publisher:

Published: 2001

Total Pages: 212

ISBN-13:

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Shinnecock Inlet, New York, is a dual-jettied inlet located on the south shore of Long Island connecting Shinnecock Bay to the Atlantic Ocean. The down-drift beach, west of the inlet, experiences chronic erosion, and cost-effective and innovative measures for beach nourishment are being examined by the U.S. Army Engineer District, New York. The feasibility of mining of the flood and ebb shoals to serve as sources of material was examined in this report. Emphasis is on the concept of 'flood-shoal engineering' within an integrated inlet and beach system. Fifteen action alternatives were developed that involved dredging, modification of the jetties, and combined dredging and structural changes. The alternatives were evaluated by their potential changes to navigation conditions, availability of material for placement on the beach, changes to inlet and channel currents that would modify scour and deposition patterns, and changes in current strength near the beach that would modify erosion. The area of compatible material, established for the flood shoal from analysis of core samples, was the targeted mining area for the study and contains approximately 1.8 x 10(exp 6) cu yd of beach-compatible sand. Exploratory alternatives were also evaluated that involved dredging in other locations. Evaluation of alternatives was conducted through circulation, wave, and morphology modeling. A calibrated circulation model was applied to simulate each alternative and compare current strength and patterns to those for the existing condition. Wave modeling was conducted for one alternative that consisted of mining the attachment bar to determine changes in the wave patterns near the shore. Morphology modeling was conducted to calculate the long-term recovery rates of the system to mining of the flood shoal.