|
|
|
Metadata
|
|
ID
|
J-1-99-SF
|
|
Abstract
|
Chief Scientists: John Chin, Paul Carlson. Seismic,
side-scan, video cruise data (Geopulse, sidescansonar,
underwatertelevision, underwatercamera) of field activity
J-1-99-SF in Central San Francisco Bay, CA from 01/11/1999 to
01/20/1999
|
|
Project/Theme
|
San Francisco Bay Pollutant and Sediment Transport
|
|
National Plan
|
Environment
|
|
Chief Scientist
|
John Chin
Paul Carlson
|
|
Activity Type
|
seismic, side-scan, video cruise
|
|
Platform
|
David Johnston
|
|
Area of Operation
|
Central San Francisco Bay, CA
|
|
Location map
|
|
|
Bounding Coordinates
|
37.92942
-122.47744 -122.19342
37.50867
|
|
Dates
|
01/11/1999 (JD 011) to 01/20/1999 (JD 020)
|
|
Analog Materials
|
list
|
|
Index map
|
|
|
Crew
|
|
John Chin
|
Chief Scientist, USGS Western Region
|
|
Paul Carlson
|
Chief Scientist, USGS Western Region
|
|
Mike Boyle
|
Electronic Tech, USGS Western Region
|
|
Hank Chezar
|
Video Specialist, USGS Western Region
|
|
Gordon Smith
|
Captain, UCSC
|
|
|
Equipment Used
|
|
Geopulse
|
|
sidescansonar
|
|
underwatertelevision
|
|
underwatercamera
|
|
|
Purpose
|
|
Obtain acoustic & video imagery of sand shoal regions and rock pinnacles
|
|
|
Information to be Derived
|
|
Morphology of the sand waves and shoals and of the rock pinnacles and surrounding sediments.
|
|
|
Summary
|
|
Good imagery across sand waves, dredge area and hazardous rock pinnacles.
|
|
|
Notes
|
|
From "Western Region coastal and Marine Geology Bulletin",
|
|
Publisher: Mike Carr, Editor: Anne Gartner, February 12, 1999:
|
|
|
|
CRUISE NEWS: R/V DAVID JOHNSTON
|
|
In mid-January 1999, the David Johnston returned to central San
|
|
Francisco Bay for follow-up studies of three bedrock knobs that
|
|
rise above the unconsolidated sediment to water depths of <39'
|
|
(LLW).
|
|
The rocks are within the general westbound traffic zone and about
|
|
200 m from the Deep Water Traffic Lane where oil tankers and cargo
|
|
vessels with drafts of 50' routinely enter the bay; thus a
|
|
potential catastrophe awaits.
|
|
The rocks have been lowered by blasting in the past (late 1800s and
|
|
early 1900s) and the Harbor Safety committee is meeting frequently
|
|
to determine how to tackle this problem under present rules and
|
|
regulations.
|
|
At their invitation, John Chin and Paul Carlson have attended
|
|
several of the meetings.
|
|
We (Mike Boyle, Paul Carlson, John Chin, and boat skipper Gordon
|
|
Smith) ran very successful hi-res seismic lines and a few side-scan
|
|
sonar lines across the rocks and over some of the sand shoal areas.
|
|
|
|
Hank Chezar joined us for one day and we obtained some good video
|
|
over two of the rocks and over one of the sand shoals.
|
|
Fortunately, we had our camera deployment before the rains came to
|
|
muddy up the water.
|
|
The accompanying photo shows Hank testing the camera system before
|
|
we left Pier 39 in San Francisco.
|
|
|
Got Help?
|
For J-1-99-SF, we would appreciate any information on -- crew, information to be derived, equipment used, information specialist, organization, ports, publications, purpose, summary.
|
|
