Summary for Field Activity Number 78031

Alternate Leg ID: AII 103

Area of Operations: Middle Atlantic Bight, Mid-Atlantic Shelf, Wilmington Canyon, Mud Patch, Great South Channel, Georges Bank, United States, North America, North Atlantic

Dates: September 28, 1978 to October 5, 1978

Chief scientist: Brad Butman
   

Objectives: 1. Deploy 5 tripod systems, 6 current moorings; recover 2 tripods and 2 current moorings. Monitor near-bottom circulation along the southern flank of Georges Bank through Great South Channel, and investigate coherence of flow between Georges Bank and the mid-Atlantic shelf. Study currents and sediment movement in the region of fine-grained sediments south of Marthas Vineyard. 2. Conduct temperature, salinity and suspended matter observations along shelf sections to determine position of moorings relative to coastal water masses to aid data interpretation. 3. Conduct sidescan sonar surveys to determine large-scale bedform distribution and direction of movement. 4. Recover, relight and replace necessary surface marker floats at tripod and current locations (so fishermen can avoid fouling their nets and leave instrumentation undisturbed).

Type of Activity: Mooring work

Information to be derived: Time series data

Summary: Recovered tripods: 2 (#148 and 149 deployed FA 78010 OCEANUS 45 May 10-18, 1978); Recovered current moorings: 2 (#150, 151 deployed FA 78010 OCEANUS 45 May 10-18, 1978). Deployed tripods: 5 (#155 and 156 both recovered FA 79002 OCEANUS 56 Mar. 6-15, 1979; #157 recovered FA 78035 WHITEFOOT Oct. 30 - Nov. 2, 1978; #158 and 159 both recovered FA 79002 OCEANUS 56 Mar. 6-15, 1979); Deployed current moorings: 6 (#160 recovered FA 79002 OCEANUS 56 Mar. 6-15, 1979; #161 incomplete recovery information; #162 partial recovery by fisherman OCEAN STATE Oct. 16, 1978; #163 recovered FA 79002 OCEANUS 56 Mar. 6-15, 1979; #164 recovered Jan. 30, 1979 no ship and cruise information; #165 recovered FA 79002 OCEANUS 56 Mar. 6-15, 1979). XBTs: 61; CTD/Transmissions: 33; Surface salinity: 91; Surface grab samples: 7 (#4727-4733); Sidescan sonar: 18 km.

USGS Project Number:

Contact: Brad Butman (bbutman@usgs.gov)

InfoBank: uses the identifier A-3-78-NA. Visit this site for more information.