USGS Coastal and Marine Geology Program

Coastal & Marine Geology Program

Field Activity Details for field activity 2006-018-FA

Other ID: none

Status: Completed

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

Funding Program(s):

Principal Investigator(s): John Bratton

Affiliate Investigator(s):

Information Specialist(s): John Bratton

Data Type(s): Environmental Data: Radon, Seismics: Sub Bottom Profiler, Location-Elevation: Navigation

Scientific Purpose/Goals: Reconnaissance-level surveying of submarine groundwater discharge indicators in lower Potomac River Estuary and western shore of Chesapeake Bay.


Start Date: 2006-09-05

Start Port/Location: Solomons, MD

End Date: 2006-09-09

End Port/Location: Solomons, MD

Equipment Used: RAD7 radon detection instrument, Knudsen 1600 USB 1.2 kW with 2 Massa transducers (3.5 kHz), DGPS

Information to be Derived:

Summary of Activity and Data Gathered: 4 September, Bratton drives gear down from Woods Hole and Crusius flies down to scout area; 5 September, Worley, Foster, Erban arrive in Solomons, set up gear on boat, troubleshoot; 6 September, seismics/CRP/radon mapping from mouth of Patuxent River into Potomac River and St. Mary's River to Dennis Pt. Marina (lines #1-6), set up RAD7 and YSI for radon time series at marina, PM Cross arrives; September 7, surveys with all systems up Maryland shore of Potomac mainstem and zigzag back downstream (lines # 7-19); September 8, surveys with all systems up part of MD shore and mostly VA shore with final crossing back north (lines # 20-26), transit back to Solomons with 5 mid-channel (Potomac) radium samples and YSI profiles, demobe gear from boat; September 9, Crusius and Bratton back to Dennis Pt. Marina in AM to collect time-series gear and four groundwater samples, others head to airport, later Crusius to airport and Bratton drives pickup and trailer with gear back to Woods Hole.

Staff: John Bratton, VeeAnn Atnipp Cross, John Crusius, Laura Erban, David Foster, Charles Worley

Affiliate Staff:
Joya Blix
first mate

Notes: Additional cruise on Chesapeake Eastern Shore likely in summer 2007. Original Center People field contained: John Bratton, Co-chief scientist; John Crusius, Co-chief scientist; VeeAnn Cross, navigation; Chuck Worley, electrical resistivity; Dave Foster, seismics; Laura Erban, contract geochem tech.
Project = Coastal Groundwater Systems, Coastal Groundwater Systems


Maryland, Potomac River estuary, Chesapeake Bay, United States, North America, North Atlantic;

North: 39 South: 37 West: -77.5 East: -75.5


photo of Kerhin


Bratton, J.F., 2007, The importance of shallow confining units to submarine groundwater flow, in Sanford, W., Langevin, C., Polemio, M., and Povinec, P., eds., A New Focus on Groundwater-Seawater Interactions: International Association of Hydrological Sciences, v. 312.

Bratton, J.F., 2010, The three scales of submarine groundwater flow and discharge across passive continental margins: The Journal of Geology, v. 118 no. 5, doi: 10.1086/655114.

Cross, V.A., Foster, D.S., and Bratton, J.F., 2010, Continuous resistivity profiling and seismic-reflection data collected in 2006 from the Potomac River estuary, Virginia and Maryland: URL:


FAN 2006-018-FA has data viewable in the GeoMappApp/Virtual Ocean applications. To view this data in these applications go to and See the instructions for locating USGS data in these applications. You can also view the imagery created from the SEGY data at

Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
RAD7 radon detection instrument --- Radon
2006-018-FA-NL-002 ( CD ROM disk of CHES POTOMAC, FIELD RADON, )
Knudsen 1600 USB 1.2 kW with 2 Massa transducers (3.5 kHz) --- Sub Bottom Profiler
2006-018-FA-SE-001 ( Raw seismic data)
SEGY seismic data ( )
DGPS --- Navigation
Nav data ( )