Summary for Field Activity Number 89027

Alternate Leg: ID (AII 122)

Area of Operations : Continental Rise offshore New Jersey, New York, DWDS 106, United States, North America, North Atlantic

Dates: September 16, 1989 to September 26, 1989

Chief scientist: Michael Bothner
   J. Fred Grassle, Rutgers University

Objectives: To test the hypothesis that particles from municipal sewage sludge disposal at Deep-water dumpsite 106 can be detected on the deep-sea floor in the vicinity of this dump site (2250-2750 m water depth). USGS objectives were to construct a detailed bathymetric map using Sea Beam (URI), deploy instruments to moniter currents and sediment transport, and to collect samples to evaluate rates of sediment mixing and accumulation and levels of chemical contaminants in surficial sediments. Data aCquired include a Sea Beam bathymetric map and digitally recorded depth data from a survey area of about 520 nmi2, (or about 1750 km2), sediment samples from gravity cores and Alvin-manipulated cores (some cores were subsampled at sea), the usual video, camera, and audio descriptive data generated by ALVIN. Current-meter and sediment-trap data retrieval tentatively scheduled for OCEANUS cruise in May 1990.

Type of Activity: Sampling;Mooring work;Seafloor mapping;

Information to be derived: Times series data;Samples and Chemical Analysis;Grain size analysis;Suspended Sediment Concentrations;Sea Floor Map;Bathymetric Maps;

Summary: Moorings deployed: 2(#336,337 recovered #90026 OCEANUS 222 Aug 2-7, 1990.)

USGS Project Number:

Contact: Michael Bothner (mbothner@usgs.gov)

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