Other ID: J-163 (Leg IV)
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Principal Investigator(s): David Twichell
Affiliate Investigator(s): Dr. Robert S. Jones (HBF); Dr. Churchill B. Grimes (Rutgers)
Data Type(s): Environmental Data: CTD, Imagery: Photo, Imagery: Video, Location-Elevation: Navigation, Sampling: Biology, Sampling: Geology, Seismics: Sub Bottom Profiler
Scientific Purpose/Goals: 1) Test our hypothesis that rough bottom topography in the Mid-Atlantic Bight resulted from bioerosion by the tilefish community, and 2) further develop the use of sidescan sonar and sub-bottom profiling as a tool for assessing critical habitat for fishery resources.
Start Date: 1984-07-28
End Date: 1984-08-04
Equipment Used: Video camera - deep sea, Camera- deep sea, Grab sampler, Loran-C, Seismic reflection, Sidescan sonar, Mooring tripod, CTD, 3.5 kHz, Geomechanique streamer
Information to be Derived:
Summary of Activity and Data Gathered: Optimal weather conditions allowed us to conduct a variety of submersible, sidescan sonar and sub-bottom profiling operations in the Middle Ground area between Block and Atlantis submarine canyons. Overall, we successfully completed 13 submersible dives and made numerous transects for sidescan sonar. Sidescan Sonar: 129.64 km; Sub-bottom profiling: 290.39; Sediment samples: 26; video and photos.
Staff: David Twichell
Notes: Original Center People field contained: Dave Twichell - scientist.
Middle Grounds area, Block Canyon, Atlantis Canyon, Veatch Canyon, mid-Atlantic Bight, North America, North Atlantic;
Able, K.W., Grimes, C.B., Jones, R.S., and Twichell, D.C., 1993, Temporal and spatial variation in habitat characteristics of tilefish (Lopholatilus hamaeleonticeps) off the east coast of Florida: Bulletin of Marine Sciences, v. 53.
Able, K.W., Twichell, D.C., Grimes, C.B., and Jones, R.S., 1987, Sidescan sonar as a tool for detection of Demersal fish habitats: Fishery Bulletin, v. 85 no. 4.
Twichell, D.C., Grimes, C. B., Jones, R. S., and Able, K. W., 1984, The role of bioerosion in shaping the outer continental shelf around Hudson Canyon, offshore Eastern United States [abs.]: , Geological Society of America, Northeastern Section, 19th Annual Meeting, Abstracts with Programs. Providence, R.I., 15-17 March 1984.
Twichell, D.C., Jones, R. S., Grimes, C. B., Able, K. W., Anonymous,, 1984, Bioerosion; its importance in shaping the outer continental shelf around Hudson Canyon off the eastern United States [abs.]: , Symposia Series for Undersea Research, NOAA National Undersea Research Conference; Undersea research and technology, scientific applications and future needs, Abstracts. Groton, Conn., 22-24 May 1984.