Other ID: none
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Location: Chandeleur Islands, Breton Sound, Louisiana, northern Gulf of Mexico, United States, North America, North Atlantic;
Principal Investigator(s): David Twichell
Information Specialist(s): Wayne Baldwin
Data Type(s): Location-Elevation: Navigation, Seismics: Sub Bottom Profiler, Sonar: Sidescan, Sonar: Interferometric, Sonar: Multibeam
Scientific Purpose/Goals: Sea floor mapping along the offshore side of the southern part of the Chandeleur Islands, Gulf of Mexico.
Start Date: 2007-06-10
Start Port/Location: Venice, LA
End Date: 2007-06-22
End Port/Location: Venice, LA
Equipment Used: DGPS, EdgeTech Subbottom 512i, Klein 3000, SWATHplus-M 234 kHz
Information to be Derived:
Summary of Activity and Data Gathered: This two-week cruise aboard the R/V ACADIANA collected bathymetric, sidescan sonar and chirp seismic data along the offshore side of the southern half of the Chandeleur Island chain of eastern Louisiana. The survey was coordinated with additional surveys conducted by the R/V GILBERT and a University of New Orleans vessel that collected bathymetric and seismic data near the islands and along the back side of the island chain. The purposes for collecting these data were (1) to provide a detailed post-Katrina bathymetry, (2) to study the processes that have shaped the sea floor in an effort to better understand the effects of Hurricane Katrina, and (3) to understand the influence of the underlying stratigraphy on the sea floor geology. The offshore geophysical dataset was collected on a grid of lines spaced 100 m apart in the shore parallel direction and 1000 m apart in the shore normal direction. Submetrix swath bathymetric data and Klein sidescan sonar imagery were collected along 2146 km of tracks and EdgeTech 512i chirp sub-bottom data were collected along 1654 km of tracks.
Staff: Wayne Baldwin, Emile Bergeron, William Danforth, Charles Worley
Notes: Original Center People field contained: Electronics technicians - Chuck Worley and Emile Bergeron; sea floor mapping processors - Bill Danforth and Wayne Baldwin.
Baldwin, W.E., Pendleton, Elizabeth A., and Twichell, David C., 2009, Geophysical data from offshore of the Chandeleur Islands, eastern Mississippi Delta: U.S. Geological Survey Open File Report 2008-1195, URL: http://pubs.usgs.gov/of/2008/1195/.
Flocks, J., Miner, Michael D., Twichell, David C., Lavoie, Dawn L., and Kindinger, Jack, 2009, Evolution and preservation potential of fluvial and transgressive deposits on the Louisiana inner shelf; understanding depositional processes to support coastal management: Geo-Marine Letters, v. 29 no. 6, doi: 10.1007/s00367-009-0164-4.
Twichell, D., Pendleton, Elizabeth, Baldwin, Wayne, and Flocks, James, 2009, Subsurface control on seafloor erosional processes offshore of the Chandeleur Islands, Louisiana: Geo-Marine Letters, v. 29 no. 6, doi: 10.1007/s00367-009-0150-x.