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Metadata
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ID
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03038
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Also Known As
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03038
B-1-03-MD
B103MD
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Abstract
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University of Toledo,United States Geological Survey, Woods
Hole, Massachusetts,United States Geological Survey, Water
Resources Division,Naval Postgraduate School Assataeague
Island. Chief Scientists: John Bratton, Dave Krantz. Data
(GPS, digitalcamera, peristalticpump, sedimentsqueezer,
CTDmeter, downholegammarayprobe, EMinduction, datalogger,
computer, drillcore) of field activity 03038 (B-1-03-MD) in
Chincoteague Bay, Maryland, United States, North America,
North Atlantic from 08/14/2003 to 08/22/2003
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Organization
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University of Toledo
United States Geological Survey, Woods Hole, Massachusetts
United States Geological Survey, Water Resources Division
Naval Postgraduate School Assataeague Island
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Project/Theme
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Atlantic Coastal Groundwater Systems
Coastal Change Hazards
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Chief Scientist
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John Bratton
Dave Krantz
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Platform
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Barge
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Area of Operation
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Chincoteague Bay, Maryland, United States, North America, North Atlantic
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Location map
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Bounding Coordinates
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38.50000
-75.45000 -75.05000
37.80000
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Ports
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leave Public Landing, MD
arrive Public Landing, MD
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Dates
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08/14/2003 (JD 226) to 08/22/2003 (JD 234)
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Analog Materials
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No analog holdings.
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Index map
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Crew
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John Bratton
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Chief Scientist (8/13-8/22), USGS Woods Hole
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Sarah Kelsey
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mobilize, in field 8/13-8/15, USGS Woods Hole
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Dirk Koopmans
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in field, demobilize 8/20-8/22, USGS Woods Hole
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Dave Krantz
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Chief Scientist, Univ. of Toledo
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Abbie Norton
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stratigraphy, geophysics, Univ of Toledo
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J. K. Bohlke
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water sampling and age dating, USGS WRD-Reston
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John Earle
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field water quality parameters and pumps, USGS WRD-Denver and Baltimore
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Brian Sturgis
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logistical support (small boat) and technical assistance, NPS-Assateague Island
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Carl Zimmerman
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logistical support (small boat) and technical assistance, NPS-Assateague Island
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Timmy Gargliano
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Captain
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Equipment Used
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GPS
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digitalcamera
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peristalticpump
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sedimentsqueezer
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CTDmeter
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downholegammarayprobe
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EMinduction
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datalogger
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computer
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drillcore
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Purpose
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Study of submarine ground water including borehole geophysics,
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porewater squeezing, sediment sampling, ground-water sampling
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Summary
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On August 14-22 a USGS-led team undertook a complex subsurface field
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effort to study the occurrence and chemistry of submarine ground water beneath
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Chincoteague Bay, Maryland as a follow-up to earlier surface geophysical
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studies. The area was made famous by Marguerite Henry's 1947 children's book
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(and later Disney movie), Misty of Chincoteague, about the wild ponies that live
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on the adjacent barrier islands, Chincoteague and Assateague. Chincoteague Bay
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is experiencing nutrient over-enrichment that is of concern to its primary
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managers, the National Park Service and the Maryland Department of Natural
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Resources. Submarine discharge of ground water recharged in agricultural areas
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on land is suspected to be a major contributor of nitrogen to the bay. Offshore
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work consisting of drilling, geophysical logging, and sampling was performed
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from a barge platform, and was augmented with onshore logging of existing wells.
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The maximum drilling depth reached by the barge rig was 72 feet beneath the
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sediment surface. The field team included John Bratton, Sarah Kelsey, and Dirk
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Koopmans (USGS-GD-Woods Hole and contractors); David Krantz and Abby Norton
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(University of Toledo); John Earle (USGS-WRD-Denver); and J.K. Bohlke and Craig
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Tobias (USGS-WRD-Reston). Drilling contractors from Hillis-Carnes Engineering
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and a barge/tug pilot provided by Hi-Tide Marine Construction consistently
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overcame difficult mechanical, geological, and meteorological conditions to get
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the science done. Special thanks go out to National Park Service colleagues
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from Assateague Island National Seashore, Brian Sturgis and Carl Zimmerman, who
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provided logistical support, shuttle boats, and lodging. The fieldwork was
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conducted safely and efficiently and produced excellent scientific results.
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Noteworthy discoveries included the presence of a plume of fully fresh ground
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water greater than 25 feet thick extending more than 1/2 mile offshore along the
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western side of the bay (Public Landing), a similar plume at the northern end of
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the bay (South Point), hypersaline brines underlying part of Assateague Island,
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and a widespread buried peat present at the base of the bay's Holocene
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sediments. Downhole gamma and electromagnetic induction logs were obtained from
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eight locations. Ground water samples were collected from nine temporary
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subestuarine wells, surface water was obtained from eight locations, and pore
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water was squeezed from 35 sediment samples. Additional analyses for age
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dating, nutrients, and stable isotopes will be performed over the coming months.
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Notes
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Navigation Techniques: Garmin GPS 76, UTM, NAD27 CONUS. HI-TIDE MARINE CONSTRUX BARGE, HI-TIDE MARINE CONSTRUCTION, OCEAN CITY, MD
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Publications
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Got Help?
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For 03038, we would appreciate any information on -- activity type, analog materials, contract, days at sea, dive count, funding, information specialist, information to be derived, kms of navigation, national plan, NGDC Info, owner, project number, scanned materials, seismic description, station count, station description, submersible, tabulated info.
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