Accession Number : AD0693443

Title :   PHYSICAL OCEANOGRAPHY OF BLOCK ISLAND SOUND.

Descriptive Note : Research rept.,

Corporate Author : NAVY UNDERWATER SOUND LAB NEW LONDON CONN

Personal Author(s) : Williams,Robert G.

Report Date : 01 JUL 1969

Pagination or Media Count : 56

Abstract : Block Island Sound (BIS), which has a mean depth of about 40 meters, has features common to both a tidal estuary and the offshore waters of the Continental Shelf. It has access to the sea through two broad channels and access to Long Island Sound through two narrow channels. In winter, the water is well mixed and of low temperature (1C - 3C). In summer, a thermocline develops, such that surface temperature is 20C, while bottom temperature may be as low as 10C. Surface salinity is about 29.00 salinity near The Race and almost 33.00 salinity near Block Island. Relatively large horizontal gradients of temperature and salinity are possible in BIS. Typical winter and summer sound-velocity profiles are presented, as well as information on density, stability, optical transparency, and currents. The currents are shown to be predominantly tidal with the semidiurnal component the most important. Current speeds approach 5 knots in The Race and decrease to 0.5 knot near Block Island. The report concludes with recommendations for future research and the proposal of a measuring program that uses moored oceanographic buoys, or towers, ships, and aircraft. (Author)

Descriptors :   (*SEA WATER, BLOCK ISLAND SOUND), CONTINENTAL SHELVES, SEA BREEZE, LONG ISLAND SOUND, TEMPERATURE, UNDERWATER SOUND, VELOCITY, SALINITY, OPTICAL PROPERTIES, SEA WATER, OCEAN CURRENTS, TIDES, WIND, MOORING BUOYS, TOWERS, OCEANOGRAPHIC SHIPS

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE