Effects of Temporary and Permanent Blankets on Tides and Currents in East River. Hydraulic Model Investigation,
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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The New York Transit Authority is considering constructing a new tunnel under East River between 63d Street, Manhattan, and 41st Avenue, Long Island City, New York, by either the open trench or the compressed air shield method. For the compressed air shield method, a temporary protection blanket would be required to prevent possible blowout during construction, and after construction is completed, a permanent blanket will be required to provide protection for the tunnel. The existing comprehensive fixed-bed model of New York Harbor was used to determine the effects of both permanent and temporary blankets in the west channel of the East River on existing hydraulic conditions. Model tests were conducted to determine the effects of a a permanent blanket with a top elevation of -45 ft mlw, b a temporary blanket with a top elevation of -35 ft mlw, and c the temporary blanket at elevation -35 ft mlw plus a movable section 90 feet wide at the top, constructed to an elevation of -5 ft mlw, on tides and currents in adjacent reaches of East River.
- Hydrology, Limnology and Potamology
- Civil Engineering