Other ID: none
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Location: Gulf of Mexico, North America, North Atlantic,
Principal Investigator(s): David Twichell
Information Specialist(s): Elizabeth Pendleton
Data Type(s): Location-Elevation: Navigation, Seismics: Sub Bottom Profiler, Sonar: Multibeam, Sonar: Sidescan, Sonar: Sound Velocity
Scientific Purpose/Goals: High-resolution seismic, swath bathymetry, and sidescan sonar mapping of the inner shelf off the Mississippi Barrier islands to map the geologic framework and assess the extent of offshore sand deposits.
Start Date: 2010-03-01
Start Port/Location: Biloxi, MS
End Date: 2010-03-17
End Port/Location: Biloxi, MS
Equipment Used: HYPACK, Multibeam swath bathymetry, Klein 3000, Sensor - SVP, EdgeTech Subbottom 512i
Information to be Derived:
Summary of Activity and Data Gathered: A cruise aboard the R/V TOMMY MUNRO was conducted March 1-17, 2010 by the Woods Hole Science Center. The purpose of the cruise was to collect swath bathymetry, sidescan sonar imagery and high-resolution chirp seismic profiles to define the sea floor morphology and the shallow stratigraphy of the inner shelf offshore of a string of barrier islands in the northern Gulf of Mexico along the Mississippi coast. The scientific goals of the project were twofold: 1) to better understand the geologic evolution of this coastal region, and 2) to provide stratigraphic information to the U.S. Army Corps of Engineers for an assessment of sand resources that they are compiling for the region. The cruise was hampered by less-than-ideal weather conditions. Data were collected during the following days: 3-9 March, 11-12 March, 14-16 March. During the cruise seismic data were collected along 1778 km of survey tracklines, swath bathymetry along 1418 km of survey tracklines, and sidescan imagery along 1332 km of survey tracklines. Preliminary processing was completed in the field on all three data types. The quality of the chirp and bathymetry data was excellent. During the initial part of the cruise, the sidescan imagery was of inferior quality because of ship noise. The location of the sidescan vehicle was moved from the port side to the stern of the ship during the first port call, and the quality improved significantly. For the lower quality imagery, processing procedures were modified to minimize the ship noise.
Staff: Wayne Baldwin, Emile Bergeron, William Danforth, David Foster, Elizabeth Pendleton, Aaron Turecek, Charles Worley
Pendleton, E.A., Baldwin, W.E., Danforth, W.W., Dewitt, N.T., Foster, D.S., Forde, A.S., Kelso, K.W., Pfeiffer, W.R., Turecek, A., Flocks, J.G., and Twichell, D.C., 2011, Geophysical data from offshore of the Gulf Islands National Seashore, Cat Island to Western Horn Island, Mississippi: U.S. Geological Survey Open-File Report 2010-1178, URL: http://pubs.usgs.gov/of/2010/1178/.