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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 |
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, Puget Sound, WA
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Bounding Coordinates
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48.41931
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-122.59655 -122.48172 |
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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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Scanned Materials
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k-1-04-ps log (pdf)
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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
Shallow stratigraphy and facies (<10 m) of marsh and delta subenvironments
using GPR
Shallow sedimentology, lithology and depositional history based on
compositional analyses and radiometric dating of sediments and organics
subsampled from cores.
Surface sediment contaminants, organic geochemistry and eelgrass biomarker
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
accumulating and burying eelgrass habitats. Ship tow video reveals that
extensive areas previously colonized by eelgrass (in aerial photographs of
1990 and 2000) are now covered by fine sand and silt. GPR data image the
distribution and morphology of tidal and distributary channels now buried
beneath agricultural land.
Sediments from cores show 1-3 m of recent fine marsh sediments and peats
overlying more than 3-7 m of medium to coarse sands interpreted as past
tide flats. Calibrated 14C ages of wood and shells more than 10 m below the
marsh surface across more than 1 km2 area of the Southern Skagit Delta
range 150 to 400 yr BP signifying rapid rates of vertical accumulation (2.3
to 6.3 cm/yr) over the historical period. Preliminary analyses of surface
sediments show that eelgrass biomarkers may be preserved in the recent
geological record and may serve as a proxy for past eelgrass abundance.
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Notes
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files exist on /imgarc2/K-1-04-PS/
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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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