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USGS Coastal and Marine Geology Program

Field Activity Details for field activity 2009-034-FA

Other ID: 09CCT02, G-2-09-GM; 09CCT03, C-3-09-GM

Status: Completed

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

Funding Program(s):

Principal Investigator(s): David Twichell

Affiliate Investigator(s): Jim Flocks, USGS-St. Pete - Chief Scientist

Information Specialist(s): David Twichell

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

Scientific Purpose/Goals: Sea floor mapping.


Start Port/Location: Moss Point, MS

End Port/Location: Moss Point, MS

Start Date: 2009-06-14

End Date: 2009-07-01

Equipment Used: Real Time Kinematic GPS, EdgeTech 424 chirp sub-bottom profiler, SubX swath bathymetry

Information to be Derived:

Summary of Activity and Data Gathered: The 2009 survey of the Mississippi/Alabama barrier islands collected swath bathymetry, backscatter imagery, and chirp sub-bottom profiles both offshore and behind the islands. The survey focused on two areas: the nearshore area surrounding Cat Island, and the nearshore area around the eastern half of Horn Island eastward to the western end of Dauphin Island. The data were collected from two platforms: the CAT BOAT, and the GILBERT. The Cat Island survey was completed between June 21-23 aboard the CAT BOAT. Swath data were collected along 176 km of track lines and chirp data along 172 km of tracklines. The Horn to Dauphin Island survey was completed using both the CAT BOAT and the GILBERT. The CAT BOAT surveyed this area between June 14 and June 20. Swath and Chirp data were collected along 377 km of trackline. The GILBERT surveyed this area between June 28 and July 1 and collected 254 km of swath data and 252 km of chirp data.

Staff: Elizabeth Pendleton

Affiliate Staff:
USGS-St. Petersburg: Jim Flocks - Chief scientist
Dana Wiese - Electronics tech.
Rich Young - GILBERT Captain
Nancy DeWitt - CAT BOAT skipper
Shawn Dadisman - Data processor

Notes: Original Center People field contained: Elizabeth Pendleton, Data processing (June 21 - July 2).
Project = Geologic Framework of Eastern Louisiana, Geologic Framework of Eastern Louisiana


Mississippi/Alabama coast, Gulf of Mexico, United States, North America, North Atlantic;

North: 30.33021 South: 30.11187 West: -89.176 East: -88.26416


Cat Boat
photo of G.K. Gilbert
G.K. Gilbert



Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Real Time Kinematic GPS --- Navigation
2009-034-FA-NL-001 ( Field logs for the GILBERT and the cat boat: both contain line numbers and names, acquisition system, collection start and end times, and notes in Excel spreadsheet format.)
SubX swath bathymetry --- Interferometric
2009-034-FA-BA-001 ( Swath bathymetry and backscatter imagery: collected via Submetrix swath bathymetry system.)
EdgeTech 424 chirp sub-bottom profiler --- Sub Bottom Profiler
2009-034-FA-SE-001 ( Subbottom profiles: collected via Edgetech 424 Chirp subbottom profiler.)

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