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Metadata
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ID
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87017
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Also Known As
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87017
PSAL_DEEP
SPRL
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Abstract
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United States Geological Survey, Woods Hole, Massachusetts.
Chief Scientists: Brad Butman, Dave Cacchione, Cheryl Ann
Butman. Geophysical and geological data (sidescansonar,
boxcore, RhoRho, Geoprobe, instrumentmooring) of field
activity 87017 (S-1-87-SC) in Pt. Sal area, Southern
California from 05/05/1987 to 05/09/1987
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Organization
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United States Geological Survey, Woods Hole, Massachusetts
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Project/Theme
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California Outer Continental Shelf Phase II Monitoring Program
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Chief Scientist
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Brad Butman
Dave Cacchione
Cheryl Ann Butman
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Activity Type
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Geophysical and geological
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Platform
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Robert Gordon Sproul
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Area of Operation
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Pt. Sal area, Southern California
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Location map
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Bounding Coordinates
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34.94330
-120.85130 -120.78600
34.94220
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Dates
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05/05/1987 (JD 125) to 05/09/1987 (JD 129)
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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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Brad Butman
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Chief Scientist, USGS Woods Hole
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Bill Strahle
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Unspecified Investigator, USGS Woods Hole
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John Moody
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Unspecified Investigator, USGS Woods Hole
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Dave Cacchione
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Chief Scientist, USGS Western Region
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Dave Drake
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Unspecified Investigator, USGS Western Region
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George Tate
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Unspecified Investigator, USGS Western Region
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Rick Vale
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Unspecified Investigator, USGS Western Region
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Jim Nicholson
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Unspecified Investigator, USGS Western Region
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Cheryl Ann Butman
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Chief Scientist, WHOI
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Chris Webb
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Unspecified Investigator, WHOI
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Jim Campbell
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Unspecified Investigator, Battelle
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Jim Marzohf
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Unspecified Investigator, IUC
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Equipment Used
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sidescansonar
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boxcore
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RhoRho
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Geoprobe
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instrumentmooring
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Purpose
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To assess the transport and fate of drilling muds
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and cuttings discharged from production platforms along the California coast.
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The continental shelf between Pt. Conception and Pt. San Luis is rather narrow,
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only 10-15 km wide. Platform Julius will be located near the edge of the shelf
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in water about 150 m dee; water less than 100 m deep is less than 5 km onshore
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and water greater than 500 m deep is less than 15 km offshore. Muds and cuttings
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discharged from these platforms may initially settle over a wide range of water
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depths where the extent and frequency of sediment movement, as well as the
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processes causing movement, will vary significantly. The field measurements
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described here are designed to describe the near-bottom flow and sediment
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movement in these differenet sedimentary environments.
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Information to be Derived
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bedforms, bottom features, vertical profile of sediment grain size, cross-shelf hydrographic sections, temperature, salinity and suspended material.
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Summary
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Current moorings were deployed at three sites across the shelf and
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slope in water depths of 83, 148, and 415 m, with instruments at approximately 6
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and 20 meters above bottom (mab) atstations A, B, and C, and an additional
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instrument at 144 m at station C. All instruments at 6 and 20 mab measured
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current, temperature, conductivity and light transmission. Geoprobes were
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deployed at sites A and B; these specialized bottom instrument systems measure
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curretn at 5 levels above the seafloor, every few hours. At each mooring site a
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limited side-scan sonarsurvey was conducted to map any bedforms or other bottom
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featurs. Box cores were collected at inshore of Santa Lucia Bank. The box cores
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were fitted witha special intev als to obtain a detailed vertical profile of
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sediment grain size in the upper 2 cm of the bottom. Two cross-shelf
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hydrographic sections were made to map the regional distribution of temperature,
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salinity and suspended material in the region of the moored observations
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Got Help?
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For 87017, we would appreciate any information on -- crew, information to be derived, equipment used, information specialist, ports, publications, purpose, summary.
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