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USGS CMG 01087 Metadata

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ID 01087
Also Known As B-87-01-DL
Abstract United States Geological Survey, Woods Hole, Massachusetts. Chief Scientists: John Bratton, Frank Manheim, USGS, Reston. Sampling data (porewater squeezers, resistivity probe, vibracoring rig, Picton, geophysical logging tools, multi-level piezometers) of field activity 01087 (B-87-01-DL) in Holts Landing State Park, south shore, Indian River Bay, Delaware, United States, North America, North Atlantic from 10/22/2001 to 10/30/2001
Organization United States Geological Survey, Woods Hole, Massachusetts
Project/Theme Coastal Groundwater Systems
Chief Scientist John Bratton
Frank Manheim
Activity Type Sampling
Platform Barge
Owner Delaware Dept Of Nat Resources Enviro Control
Area of Operation Holts Landing State Park, south shore, Indian River Bay, Delaware, United States, North America, North Atlantic, Delaware
Bounding Coordinates
-76.50000     -74.75000
Dates 10/22/2001 (JD 295) to 10/30/2001 (JD 303)
Analog Materials No analog holdings.
Information Specialist
John Bratton Chief Scientist
Frank Manheim USGS, Reston, Chief Scientist
John Bratton
J.K. Bohlke USGS, Reston
Dave Krantz U. Toledo
Pam Haywood
Demola Soyinka
Pete Swarzenski USGS, St. Petersburg, and USF intern
Morgan Crawford
Bob Frasier
Don Queen USGS-Reston
Hugh Scott MPI Drilling
Dan Phelan USGS-WRD, Baltimore
Bill Daisy Supervisor (captain)
Equipment Used
porewater squeezers
resistivity probe
vibracoring rig
geophysical logging tools
multi-level piezometers
Collect core samples to: (1) verify results of previous
resistivity surveys by targeting paired low-resistivity (brackish) and
high-resistivity (fresh) sites, and (2) determine the influence of
paleotopography on ground water flow by choosing nearshore and offshore
targets in a known incised paleovalley imaged in previous seismic surveys.
Information to be Derived
Samples and Chemical Analysis
DNREC Barge Cores and gamma logs from four sites provided a vertical
sequence of lithology to correlate with the seismic profiles and infer
permeability structure. EM logs were run to measure pore fluid
conductivities for comparison with the resistivity profiles. The gamma and
EM logs were interpreted to guide in situ sampling of discrete ground
water masses using a screened drivepoint for geochemistry and age dating.
The combined results show a complex and dynamic system of ground water
flow with appreciable control by stratigraphy. The flow of fresh ground
water produces plumes 20 m thick and 400 to 600 m wide that may extend 1
km or more from shore beneath the estuary. The lateral boundaries of a
fresh water plume may be abrupt and nearly vertical, or extend
horizontally as a diffuse layer for hundreds of meters. The lower boundary
of the plume shallows moving offshore and a mixing zone with brackish
water develops. The ground water plumes studied follow incised valleys of
tributary streams, but the dimensions of the plumes are much larger than
the valleys. The fine-grained, low-permeability sediments filling the
valleys appear to act as semiconfining layers that restrict infiltration
of the overlying saline water of the estuary and permit flow of fresh
water far offshore.
Project Number
USGS Office of Ground-Water, USGS CMGP, Delaware Sea Grant
Bratton, John F., Bhlke, J.K., Manheim, Frank T.,
Krantz, David E., 2004, Ground water beneath coastal bays of the Delmarva
Peninsula: Ages and nutrients:  Ground Water, vol. 42, no. 7, p.
Manheim, Frank T., David E. Krantz, John F. Bratton, 2004,
Studying ground water under Delmarva coastal bays using electrical
resistivity:  Ground Water, vol. 42, no. 7, p. 1052-1068.
Krantz, David E., Frank T. Manheim, John F. Bratton, Daniel J. Phelan, 2004,
Hydrogeologic setting and ground water flow beneath a section of Indian
River Bay, Delaware: Ground Water, vol. 42, no. 7, p. 1035-1051.
Bhlke, John Karl, and David E. Krantz, Isotope Geochemistry and Chronology of
Offshore Ground Water Beneath Indian River Bay, Delaware, Water-Resources
Investigations Report 03-4192, URL:
Got Help? For 01087, we would appreciate any information on -- analog materials, contract, days at sea, dive count, kms of navigation, national plan, NGDC Info, notes, scanned materials, seismic description, station count, station description, tabulated info.
Type Webpage KMZ Arc         Metadata         WHSC
Geochemical       data
Metadata data     txt  data  FAQ  xml data
Navigation data nav      
Times   050.times      

01087 location map of where navigation 

equipment operated

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