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):
Oceanus |
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.
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. |
Survey Equipment | Survey Info | Data 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 ) |