Field Activity 2006-024-FA

Identifier 2006-024-FA
Purpose Sea floor mapping of pockmark field at mouth of Penobscot River.
Location Penobscot River, Belfast Bay, Penobscot Bay, Maine, United States, North Atlantic;
Summary The survey took place from 11-18 September on board the R/V Rafael. We collected swath bathymetry, sidescan sonar backscatter, and sub-bottom profiles over an area of approximately 25 km2. The survey focused on the mouth of the Penobscot River where it enters upper Penobscot Bay (also known as Belfast Bay). This area is the primary depositional site for sediment carried by the river, and would probably experience significant impacts if/when the proposed dam removals occur in upstream areas. With these data as a pre-removal baseline, we will be able to quantify any changes in bottom morphology and substrate conditions that might result from releasing sediment from upstream impoundments. These new data will be compared to a bathymetric survey collected in 1999 by NOAA that covers part of the same area. Where the data overlap, we will be able to determine what (if any) changes have occurred over the last 7 years and make conclusions about the rates and patterns of sediment accumulation at the mouth of the river.
Comments Original Center People field contained: Barry Irwin (boat captain); William Danforth (tech); Emile Bergeron (tech); Brian Andrews (data processing); Walter Barnhardt (PI). Project = Belfast Bay Pockmarks, Belfast Bay Pockmarks
25 feet
Start Belfast, ME 2006-09-11
End Belfast, ME 2006-09-18
Days in the field 8
West -69
East -68.75
North 44.5
South 44.33333


384 Woods Hole Road
Quissett Campus
Woods Hole, MA02543-1598
(508) 548-8700
Principal investigators Walter Barnhardt
Crew members
William W Danforth
Scientist, Staff
Walter Barnhardt
Scientist, Staff
Brian Andrews
Scientist, Staff
Emile Bergeron
Scientist, Staff
Barry J Irwin
Scientist, Staff
Information specialist(s)
Brian Andrews
Specialist, Information
Affiliate principal Joe Kelley, University of Maine
Affiliate staff Joe Kelley and Laura Brothers, University of Maine

Data types and categories

Data category: Location-Elevation, Seismics, Sonar
Data type: Navigation, Sub Bottom Profiler, Sidescan, Sound Velocity, Interferometric

Equipment used

Equipment Usage description Data types Datasets
Real Time Kinematic GPS Navigation (no data reported)
EdgeTech 424 chirp sub-bottom profiler Sub Bottom Profiler 1
SEA SWATHplus-M 234 kHz Interferometric 2
Klein 3000 Sidescan (no data reported)
Sensor - SVP Sound Velocity (no data reported)


Datasets compiled from multiple sources

Dataset name Equipment Description Dataset contact
BelfastBay_EdgeTech_424 EdgeTech 424 chirp sub-bottom profiler Seismic reflection-tracklines, shotpoints, and profile images collected in the Belfast Bay, Maine pockmark field using an EdgeTech SB-424 subbottom profiler during USGS field activities 2006-024-FA and 2009-037-FA Brian Andrews
BelfastBay_SWATHplus_Bathymetry_5m SEA SWATHplus-M 234 kHz Bathymetric data collected in the Belfast Bay, Maine pockmark field using a SWATHplus-M interferometric sonar in 2006 and 2008, by the U.S. Geological Survey Brian Andrews
BelfastBay_SWATHplus_bathymetry_tracklines SEA SWATHplus-M 234 kHz Bathymetry tracklines collected in the Belfast Bay, Maine pockmark field using a SWATHplus-M interferometric sonar in 2006 and 2008, by the U.S. Geological Survey Brian Andrews


Samples collected during this field activity