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USGS CMG 07005 Metadata

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ID 07005
Also Known As T-1-07-CH
07005
Abstract United States Geological Survey, Woods Hole, Massachusetts. Chief Scientist: John Bratton. Data (Continuous resistivity, 100-m and 50-m streamers, radon and radium sampling, piezometers) of field activity 07005 (T-1-07-CH) in Chesapeake Bay, United States, North America, North Atlantic from 05/14/2007 to 05/24/2007
Organization United States Geological Survey, Woods Hole, Massachusetts
Project/Theme Coastal Groundwater Systems
Chief Scientist John Bratton
Platform Terrapin
Area of Operation Chesapeake Bay, United States, North America, North Atlantic, Chesapeake Bay
Bounding Coordinates
39.10000
-76.15000     -76.06000
39.04000
Ports LEAVE Corsica River Estuary, Centreville, Maryland
ARRIVE Corsica River Estuary, Centreville, Maryland
Dates 05/14/2007 (JD 134) to 05/24/2007 (JD 144)
Analog Materials No analog holdings.
Information Specialist
John Bratton
Crew
John Bratton Chief Scientist
John Crusius USGS-Woods Hole, co-chief
Kevin Kroeger USGS-Woods Hole, co-chief
Laura Erban USGS-Woods Hole
Sandy Baldwin USGS-Woods Hole
Adrian Green USGS-Woods Hole
Chuck Worley USGS-Woods Hole
Veeann Cross USGS-Woods Hole
Jeff Cornwell UMD-Horn Point
Jennifer Bowen MBL
Chuck Worley
Equipment Used
Continuous resistivity
100-m and 50-m streamers
radon and radium sampling
piezometers
Purpose
Electrical resistivity surveying,
submarine groundwater sampling with piezometers,
and groundwater discharge measurements in the
Corsica River Estuary
Information to be Derived
Samples and Chemical Analysis;Electrical
resistivity data, seepage meter data
Summary
The estuary of Maryland s Corsica River,
a small tributary on the eastern shore of
Chesapeake Bay, was the site of fieldwork during
April and May 2007. An interdisciplinary team of
U.S. Geological Survey (USGS) scientists
investigated submarine ground-water
discharge the movement of ground water into
the coastal ocean via underwater seepage.
Resource managers are concerned about nutrients
entering the estuary through this pathway,
leading to eutrophication, harmful algal blooms,
and fish kills. The Corsica River watershed has
been targeted by the State of Maryland for
implementation of intensive restoration efforts
to improve water quality.  The scientists sought
to test hypotheses about ground-water flow under
the estuary and ground-water discharge into the
estuary and to constrain the results of ongoing
modeling efforts by colleagues from the USGS
Water Resources Discipline, including Ward
Sanford. The team used a continuous
resistivity-profiling system (a method for
detecting low-salinity submarine ground water
over a large area), offshore piezometers
(temporary wells used to collect ground-water
samples from discrete depths), seepage meters
(devices for measuring direct ground-water
discharge at a particular location on the
sediment surface), and a raft equipped with
instrumentation to measure radon-222 (a natural
tracer of ground-water discharge). This work
expands on a previous investigation in the lower
Potomac River estuary in September 2006, which
characterized similar processes in that
geologically distinct and much larger,
western-shore tributary of Chesapeake Bay.
Results of sampling and geophysical measurements
indicate that the Corsica River estuary is
underlain by fresh ground water in sediment
pores at depths of less than 1 m to more than 5
m below the sediment surface, depending on
distance from shore and the presence of
confining units. In some locations, low-salinity
ground water may extend more than 200 m
offshore, as evidenced by electrical-resistivity
data. Brackish ground water that was more saline
than surface water was encountered at shallow
subsurface depths at sites more than 8 m from
shore, indicating submarine recharge during a
previous period when surface-water salinity was
higher. Samples of ground water and surface
water were collected for analysis of nutrients,
stable isotopes, radioisotopes, and age tracers,
among other parameters. Ground-water discharge
and submarine recharge at the site were highly
dynamic, as evidenced by changes in the salinity
of ground-water samples collected at the same
locations on different days, large variations in
seepage-meter measurements, and fluctuations by
a factor of three or more in surface-water radon
activities during the measurement period.  John
Bratton, John Crusius, and Kevin Kroeger of the
USGS Woods Hole Science Center (WHSC) in Woods
Hole, Massachusetts, conducted the work, with
assistance from other WHSC personnel, including
VeeAnn Cross, Chuck Worley, Laura Erban, Adrian
Green, and Sandy Baldwin. Collaborators included
Jennifer Bowen, who recently completed a term as
a Postdoctoral Scientist at the Woods Hole
Marine Biological Laboratory. Bowen performed
microbial sampling in the field and prepared
samples in the laboratory of Jeff Cornwell at
the University of Maryland Center for
Environmental Science Horn Point Laboratory. Bob
Shedlock (USGS Maryland-Delaware-District of
Columbia Water Science Center) provided helpful
input during the design stage of the field
effort.  The work was supported financially by
the USGS Coastal and Marine Geology Program
(John Haines, Program Coordinator), the USGS
Priority Ecosystems Science Program (Scott
Phillips, Chesapeake Bay Ecosystem Coordinator),
and the Maryland Department of Natural Resources
(John McCoy, Ecosystems Restoration Division
Chief). The field effort benefited significantly
from the logistical support and hospitality of
the Queen Anne s County Department of Parks and
Recreation (Gary Rzepecki, Parks Superintendent)
and the Corsica River Yacht Club (Reed Rogers,
Commodore).
Notes
Initial results presented at ERF meeting
in Providence, RI in 2007; USGS Chesapeake Bay
meeting Baltimore, MD, Dec 2007; and Ocean
Sciences meeting in Orlando, FL, 2008.
11 days at sea.
Related web site(s): http://soundwaves.usgs.gov/2007/08/
Funding
CMGP and PES, possible MD-DNR
Got Help? For 07005, we would appreciate any information on -- activity type, analog materials, contract, days at sea, dive count, kms of navigation, national plan, NGDC Info, owner, project number, publications, scanned materials, seismic description, station count, station description, submersible, tabulated info.
Type Webpage KMZ Arc         Metadata         WHSC
Geochemical       data
Metadata data     txt  data  FAQ  xml data
Navigation data nav      
Times   050.times      

07005 location map of where navigation 

equipment operated

 
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