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Metadata
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ID
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Z-1-07-MB
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Also Known As
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MBARI ID 295
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Abstract
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Monterey Bay Aquarium Research Institute,United States
Geological Survey, Menlo Park, California,Stanford
University,Chevron Energy Technology Company. Chief
Scientist: Dave Caress. Chirp and Multibeam Sonar data
(multibeam, Chirp) of field activity Z-1-07-MB in Little
Lucia Canyon and lobe area from 03/12/2007 to 03/14/2007
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Organization
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Monterey Bay Aquarium Research Institute
United States Geological Survey, Menlo Park, California
Stanford University
Chevron Energy Technology Company
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Chief Scientist
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Dave Caress
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Activity Type
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Chirp and Multibeam Sonar
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Platform
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Zephyr
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Area of Operation
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Little Lucia Canyon and lobe area
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Location map
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Bounding Coordinates
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35.75545
-121.80330 -121.76736
35.72686
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Ports
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LEAVE Moss Landing
ARRIVE Moss Landing
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Dates
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03/12/2007 (JD 071) to 03/14/2007 (JD 073)
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Analog Materials
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No analog holdings.
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Index map
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Information Specialist
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Crew
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David Caress
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Chief Scientist, MBARI
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Katie Maier
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Scientist, Stanford
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Hans Thomas
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AUV operations, MBARI
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Duane Thompson
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AUV operations, MBARI
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Aaron Gregg
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Zephyr crew (Master), MBARI
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Matthew Noyes
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Zephyr crew (Engineer), MBARI
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Paul Ban
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Zephyr crew (Mate), MBARI
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Perry Shoemake
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Zephyr crew (Mate), MBARI
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Equipment Used
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Purpose
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Three AUV dives were planned in the Little Lucia channel system,
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located offshore between Point Sur, CA and the offshore Santa Maria Basin.
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The primary target was the transition from highly channelized to unconfined
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sedimentation features. The areas mapped are in water depths of 975 to 1050 m.
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The primary objective of these dives is to obtain multibeam bathymetric data
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and subbottom profiles. Processing and analysis of this data will be used to
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study the sedimentary architecture of the area. Approximately 1.5-m-long
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vibracores were taken using the MBARI ROV Tiburon during cruise W-4-06-MB.
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Information to be Derived
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Very high-resolution bathymetry and subbottom structure of the Little
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Lucia channel and lobe system. Bathymetric maps are produced at a one-meter
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contour interval.
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Summary
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~1600/JD071 R/V Zephyr departs Moss Landing.
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~1411/JD072 Begin first successful AUV dive over Little Lucia
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~2311/JD072 Complete first successful AUV Dive over Little Lucia
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~1000/JD073 R/V Zephyr arrives in Moss Landing
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A total of 2 AUV dives were completed. The first dive was unsuccessful because problems
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with the acoustic modem prevented accurate tracking of the AUVs location. Releasing
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the AUVs drop weight failed to cause the AUV to abort the dive, but the data collected
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cannot be used for analysis. A second dive covered the same area planned for the first
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dive and successfully collected multibeam bathymetry and subbottom data.
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The AUVs starting position was determined by GPS at the launch site. The vehicle then
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dives in a USBL-nav-aided spiral to 50 meters above the seafloor. The total survey
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trackline was 42.5 km with 150 m line spacing. The AUV can survey with the multibeam
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sounding system and chirp sonar for ~9 hours; it then returns to the sea surface to be
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picked by the R/V Zephyr.
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Only one-third of the objectives of the cruise were attained because of weather. A second
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cruise is planned to complete the two additional dives.
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Notes
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Used seafloor mapping AUV; MBARI's automated underwater vehicle (AUV)
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for sea-floor mapping and subbottom profiles. The AUV has a high-resolution
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Edgetech chirp sonar profiling system and a multibeam sounding system and uses
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both Doppler sonar tracking of the sea floor and an inertial guidance system
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for position control. The AUV descends to 50 m above the seafloor with
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USBL-nav-aided spiral descent.
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Got Help?
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For Z-1-07-MB, we would appreciate any information on -- analog materials, contract, days at sea, dive count, funding, kms of navigation, national plan, NGDC Info, owner, project, project number, publications, scanned materials, seismic description, station count, station description, submersible, tabulated info.
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