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Metadata
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ID
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K-1-04-PS
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Abstract
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United States Geological Survey, Menlo Park, California.
Chief Scientist: Eric Grossman. Geological and Geophysical
data (bathymetry, underwatertelevision,
groundpenetratingradar, vibratingcore, VanVeengrab, imagery)
of field activity K-1-04-PS in Skagit River Delta, Puget
Sound, WA from 03/06/2004 to 03/07/2004
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Organization
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United States Geological Survey, Menlo Park, California
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Project/Theme
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Coastal Habitats in Puget Sound
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Chief Scientist
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Eric Grossman
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Activity Type
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Geological and Geophysical
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Platform
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Karluk
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Area of Operation
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Skagit River Delta, Puget Sound, WA
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Location map
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Bounding Coordinates
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48.41931
-122.59655 -122.48172
48.26192
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Ports
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leave Seattle
arrive Pt. Angeles
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Dates
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03/06/2004 (JD 066) to 03/07/2004 (JD 067)
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Analog Materials
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list
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Index map
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Information Specialist
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Crew
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Eric Grossman
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Chief Scientist, USGS Western Region
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Mike Boyle
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Mechanical Engineer, USGS Western Region
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Larry Kooker
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Electronic Engineer, USGS Western Region
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Andy Stevenson
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Information Specialist, USGS Western Region
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Bill Danforth
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Information Specialist, USGS Woods Hole
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Greg Hood
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Scientist, Skagit River System Cooperative
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Jesse Stark
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Captain, NOAA
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Equipment Used
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bathymetry
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underwatertelevision
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groundpenetratingradar
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vibratingcore
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VanVeengrab
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imagery
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Purpose
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Submetrix swath sonar work, ship-towed video, ground penetrating radar, coring, and sediment and eelgrass grab samples.
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Information to be Derived
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Bathymetry and substrate type (backscatter) of Skagit Bay
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Shallow stratigraphy and facies (<10 m) of marsh and delta subenvironments
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using GPR
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Shallow sedimentology, lithology and depositional history based on
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compositional analyses and radiometric dating of sediments and organics
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subsampled from cores.
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Surface sediment contaminants, organic geochemistry and eelgrass biomarker
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concentrations and isotopes from sediment grabs.
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Summary
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Bathymetry data along delta front shows evidence that sediment is
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accumulating and burying eelgrass habitats. Ship tow video reveals that
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extensive areas previously colonized by eelgrass (in aerial photographs of
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1990 and 2000) are now covered by fine sand and silt. GPR data image the
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distribution and morphology of tidal and distributary channels now buried
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beneath agricultural land.
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Sediments from cores show 1-3 m of recent fine marsh sediments and peats
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overlying more than 3-7 m of medium to coarse sands interpreted as past
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tide flats. Calibrated 14C ages of wood and shells more than 10 m below the
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marsh surface across more than 1 km2 area of the Southern Skagit Delta
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range 150 to 400 yr BP signifying rapid rates of vertical accumulation (2.3
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to 6.3 cm/yr) over the historical period. Preliminary analyses of surface
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sediments show that eelgrass biomarkers may be preserved in the recent
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geological record and may serve as a proxy for past eelgrass abundance.
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Notes
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Publications
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Got Help?
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For K-1-04-PS, we would appreciate any information on -- contract, days at sea, dive count, funding, 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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