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Metadata
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ID
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P-1-89-SF
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Abstract
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United States Geological Survey, Menlo Park, California.
Chief Scientists: John Chin, Ed Clifton. Geophysical data
(Kleinsidescan, 200khz, radar) of field activity P-1-89-SF in
San Francisco Bay, California from 00/00/1989 to 00/00/1989
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Organization
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United States Geological Survey, Menlo Park, California
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Chief Scientist
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John Chin
Ed Clifton
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Activity Type
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Geophysical
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Platform
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Polaris I
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Area of Operation
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San Francisco Bay, California
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Location map
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Bounding Coordinates
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38.25000
-123.25000 -121.25000
37.25000
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Dates
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00/00/1989 (JD 000) to 00/00/1989 (JD 000)
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Analog Materials
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list
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Index map
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Crew
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John Chin
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Chief Scientist, USGS Western Region
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Ed Clifton
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Chief Scientist, USGS Western Region
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Equipment Used
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Kleinsidescan
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200khz
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radar
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Purpose
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To study the southern and northern parts of the bay in a
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manner analogous to that of Rubin and McCulloch (1979) for central
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SF Bay. To study the surficial characteristics and composition of
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the bay floor, and how physical processes both form and modify it
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into different morphologies.
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Information to be Derived
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Tracklines were plotted on overlays of the 1:40,000-scale National Ocean Survey bathymetric maps of San Francisco Bay (Sheets 1, 2, 3). Maps of the distribution of bedforms.
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Summary
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Reconnaissance investigation characterizes the surficial
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morphology of the bay floor as revealed by side-scan sonar imaging
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and high-resolution bathymetry and deduces the general nature of
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sedimentation, bedload sediment transport directions, and areas of
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depostion versus erosion. Results should apply to current issues
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involving sedimentation, dredging, pollution, and the disposal of
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dredge spoils in the San Francisco Bay system and the highly
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developed urban areas that border it.
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Field work for this study was conducted using the USGS Water
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Resources Divsion Research Vessel Polaris. Side-scan sonar profiles
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were collected using a Klein system operated at a frequency of
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either 100 kHz (South Bay or 500 kHz (North Bay). This system is
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comprised of a graphic recorder and towfish that can be operated at
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varying frequencies and slant ranges. In general, slant ranges of
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100 m (200-m swath) or 150 m (300-m swath) were used for optimum
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resolution of bottom features on the bay floor. Towing speed
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averaged 7.4 km/hour, although this varied greatly with tidal current
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speed and direction as well as local wind regime. No attempt was
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made to acqurie overlapping side-scan sonar images.
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An Innerspace fathometer was used to acquire high resolution
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bathymetry. This system operated at a frequency of 200 kHz with a
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hull-mounted transducer. The bathymetry was not corrected for tidal
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elevation. Navigation was obatined with a shipboard Raytheon precision
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radar. Fixes were plotted every 5 min. and correspond to the event
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marks on the side-scan sonar and fathometer records.
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The floor of South and North San Francisco Bay is characterized by
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five surficial bottom types based on a reconnaissance survey using
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side-scan sonar and a fathometer. The five bottom types are
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1) furrows,
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2) lineations,
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3) sand waves,
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4) tonal patches,
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5) featureless.
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Got Help?
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For P-1-89-SF, we would appreciate any information on -- contract, days at sea, dive count, funding, information specialist, kms of navigation, national plan, NGDC Info, notes, owner, ports, project, project number, publications, scanned materials, seismic description, station count, station description, submersible, tabulated info.
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