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USGS Coastal and Marine Geology Program

Field Activity Details for field activity 1992-016-FA

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Other ID: 251

Status: Completed

Organization(s): USGS, Woods Hole Coastal and Marine Science Center

Funding Program(s):

Principal Investigator(s): James M. Robb

Affiliate Investigator(s):

Information Specialist(s):

Data Type(s): Location-Elevation: Navigation, Seismics: Sub Bottom Profiler, Sonar: Sidescan

Scientific Purpose/Goals: Sidescan sonar imaging of the ocean bottom around the DWDS-106 Municipal Sludge dumpsite, for support of DSRV ALVIN dives and to characterize sea-floor microtopography.

Vehicle(s):

Start Port/Location: Woods Hole, MA

End Port/Location: Woods Hole, MA

Start Date: 1992-07-20

End Date: 1992-07-29

Equipment Used: AMS 120 sidescan, GPS (wh), Loran-C, 3.5 kHz

Information to be Derived:

Summary of Activity and Data Gathered: AMS-120 sidescan unit with the Qmips processing system functioned very well, with only 4 hours lost when a wire termination failed apparently due to tow strumming. Site surveys were accomplished at 4 off-dumpsite sites, and two areas within the dumpsite study area were imaged and mosaicked while at sea. The data commonly show features indicating offshore-directed bottom flows. A control site (2600 m at 70 deg 40 min W) and 2 sampling sites SW of the main study area show a smooth ocean bottom, with minor flow indications, such as elongated moats or dune structures. Within the study area, in contrast, our 8-line mosaic shows striking offshore lineations, evidently erosional furrows (parts were observed last year using Jason), as well as smooth bottom where a tongue of muddy sediments overlies the furrowed surface. The furrows lie downslope from where canyons debouch. Also mosaicked with three lines was a rough area of greater relief and high backscatter that may be part of a large olistostrome (landslide block).

Staff: Jana DaSilva, William Danforth, Jane Denny, Molly Gowen, Thomas O'Brien, James M. Robb, William Schwab, Melissa Walden

Affiliate Staff:
Tom Crook - WHOI
Denzel Gleason - WHOI

Notes: Project = DWDS-106 Sewage Sludge Investigation, DWDS-106 Sewage Sludge Investigation

Location:

Deep Water Dump Site DWDS 106, Continental Rise offshore New Jersey, New York, United States, North America, North Atlantic;

Boundaries
North: 39.87789547 South: 38.17583186 West: -73.09324992 East: -70.62500573

Platform(s):

photo of Oceanus
Oceanus

Publications

Robb, J.M., 1994, Geologic features of the sea bottom around a municipal sludge dumpsite near 39 degrees N., 73 degrees W., offshore New Jersey and New York: U.S. Geological Survey Open-File Report 94-152, https://doi.org/10.3133/ofr94152.

Portals/Viewers

Documents associated with this activity

Title Survey Equipment Description
Cruise report (document not focused on specific equipment) Chief Scientist's cruise report including personnel, purpose, results summary, equipment, and tabulated information.
Cruise log (document not focused on specific equipment) Chief Scientist's and watchstanders' log with equipment configuration and performance an data acquisition notes.
Q-Mips log AMS 120 sidescan Q-Mips sidescan sonar log with line number, file name, start and ends times and data acquisition comments.
Data inventory (document not focused on specific equipment) Cruise curator's inventory of field data, including media, content, quantity.
Cruise report (document not focused on specific equipment) WHOI cruise report including ship utilization date, trackmap, pre-cruise plan from chief scientist, watch list, berthing plan, dive site location map.

Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
AMS 120 sidescan --- Sidescan
1992-016-FA-SO-001 (Paper sidescan mosaics: 8 without overlays, 2 with bathymetry overlain on separate acetate sheet. Data collected with AMS120 sidescan system.)
GPS (wh) --- Navigation
1992-016-FA-LN-001-01 (Raw navigation data files.)
1992-016-FA-LN-002 (Trackmap of 3.5 kHz survey lines from 1992 DWDS106 survey: some hand annotations.)
Loran-C --- Navigation
3.5 kHz --- Sub Bottom Profiler
1992-016-FA-SE-002 (microfilm of )

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