USGS Coastal and Marine Geology Program

Coastal & Marine Geology Program

Field Activity Details for field activity 2006-001-FA

Other ID: none

Status: Completed

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

Funding Program(s):

Principal Investigator(s): David Twichell

Affiliate Investigator(s): Lee Edmiston, Apalachicola Bay National Estuarine Research Reserve

Information Specialist(s):

Data Type(s): Imagery: Photo, Location-Elevation: Navigation, Seismics: Sub Bottom Profiler, Sonar: Multibeam, Sonar: Sidescan, Sonar: Sound Velocity

Scientific Purpose/Goals: Complete sea floor mapping of Apalachicola Bay using the RAFAEL to map areas deeper than 2 m and the ASV IRIS for mapping areas shallower than 2 m.


Start Date: 2006-05-29

Start Port/Location: Apalachicola, FL

End Date: 2006-06-27

End Port/Location: Apalachicola, FL

Equipment Used: EdgeTech 424 chirp sub-bottom profiler, Digital camera, Real Time Kinematic GPS, SWATHplus-M 234 kHz, Edgetech 4200 sidescan, Klein 3000, Sensor - SVP

Information to be Derived:

Summary of Activity and Data Gathered: This field season marked the second year of surveying in Apalachicola Bay. The goal of the mapping project was to provide an updated map of the distribution of oyster beds in the bay. Continuous coverage sidescan sonar imagery and bathymetric data were used to achieve this goal, and high-resolution chirp profiles were used to define the geologic framework upon which the oyster beds are set. The bay is shallow (average depth 2.5 m), and the crests of most of the oyster beds are in water depths less than 1 m. Consequently the entire area could not be surveyed using the RAFAEL. IRIS, the newly acquired ASV, was used to map the shallow areas. This was the first use of this system, and it proved quite successful. This year's field operation was conducted during late May and June. The RAFAEL collected data during 25 days of the 29-day field program and IRIS collected data during 14 days. Aboard RAFAEL RTK GPS navigation, Klein sidescan sonar imagery, Submetrix interferometric bathymetry, and chirp sub-bottom profiles were collected in digital form along 1492 km of trackline. IRIS collected RTK GPS navigation, EdgeTech sidescan sonar imagery, single-beam bathymetry, and chirp sub-bottom data in digital form along 148 km of tracks. From the two platforms data (all in digital form) were collected along 1640 km of survey lines.

Staff: Brian Andrews, Emile Bergeron, Jane Denny, Barry Irwin, Thomas O'Brien, David Twichell, Charles Worley

Affiliate Staff:
Lee Edmiston
Apalachicola National Estuarine Research Reserve; Bill Stevenson
NOAA Coastal Services Center

Notes: Original Center People field contained: Barry Irwin (boat captain); Charles Worley (electronics technician on RAFAEL); Emile Bergeron (electronics technician for IRIS); Thomas O'Brien (electronics technician for IRIS); Jane Denny (data processor); Brian Andrews (data processor); Dave Twichell (chief scientist).
Project = Apalachicola Bay Habitat Mapping, Apalachicola Bay Habitat Mapping


Apalachicola Bay, Florida, United States, Gulf of Mexico, North America, North Atlantic;

North: 29.78333 South: 29.58333 West: -85.1667 East: -84.75


photo of Rafael


Bergeron, E., Worley, C., and O'Brien, T.F., 2007, Progress in development of shallow-water mapping systems by the U.S. Geological Survey: Sea Technology, v. 48 no. 6.

Cross, V.A., Twichell, D.C., Foster, D.S., and O'Brien, T.F., 2012, Apalachicola Bay Interpreted Seismic Horizons and Updated IRIS Chirp Seismic-Reflection Data: URL:

Osterman, L.E., Twichell, David C., and Poore, Richard Z., 2009, Holocene evolution of Apalachicola Bay, Florida: Geo-Marine Letters, v. 29 no. 6, doi: 10.1007/s00367-009-0159-1.

Twichell, D., Edmiston, L., Andrews, B., Stevenson, W., Donoghue, J., Poore, R., and Osterman, L., 2010, Geologic controls on the recent evolution of oyster reefs in Apalachicola Bay and St. George Sound, Florida: Estuarine, Coastal and Shelf Science, v. 88 no. 3, pp. 385–394, doi: 10.1016/j.ecss.2010.04.019.

Twichell, D.C., Andrews, B.D., Edmiston, H.L., and Stevenson, W.R., 2007, Geophysical mapping of oyster habitats in a shallow estuary; Apalachicola Bay, Florida: URL:

Twichell, D.C., Pendleton, E.A., Poore, R.Z., Osterman, L.E., and Kelso, K.W., 2009, Vibracore, radiocarbon, microfossil, and grain-size data from Apalachicola Bay, Florida: URL:


Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
EdgeTech 424 chirp sub-bottom profiler --- Sub Bottom Profiler
2006-001-FA-SE-002 ( Autonomous Surface Vehicle (ASV) IRIS - Seismic profile data in EdgeTech FSSB-424 (4-24 kHz))
Digital camera --- Photo
2006-001-FA-PH-001 ( Deck photos of field activity operations)
Real Time Kinematic GPS --- Navigation
SWATHplus-M 234 kHz --- Interferometric
Bathymetry GIS data ( )
Edgetech 4200 sidescan --- Sidescan
2006-001-FA-SO-002 ( RAW IRIS DATA - EdgeTech 4200FS (100/400 kHz) collected from Autonomous Surface Vehicle (ASV) IRIS.)
Klein 3000 --- Sidescan
Sidescan mosaic ( )
Sensor - SVP --- Sound Velocity