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Deep Sound
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2009
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Melville
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Project Title: |
Deep Sound |
Project Status: |
Submitted |
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Principal Investigator: |
David R. Barclay, SIO |
Project Institution: |
SIO |
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Project ID: |
101829 |
Version #: |
2 |
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Date Submitted: |
1/9/2009 5:38:00 PM |
Created By: |
David R. Barclay |
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Date Last Modified: |
1/9/2009 5:45:00 PM |
URI Serial #: |
None |
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Funding Agencies: |
INST/UCSD/SIO - NONE - Funded |
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Summary of Field Work: |
Deep Sound is a high-bandwidth acoustic recording, free-falling system designed to profile ambient noise from the surface to depths of 9 km. The recording platform is autonomous and descends under gravity at 1 m/s to its pre-programmed maximum depth, where a burn-wire releases a weight, permitting the system to return to the surface under its own buoyancy. Two hydrophones are mounted at half meter vertical spacing allowing the noise spectrum and vertical coherence (directionality) to be obtained over four decades of frequency (10 Hz – 100 kHz). The acoustic recordings are made continuously as the instrument descends and ascends along with measurements of sound speed and depth. The system’s low power and large data storage capability allows round trips to the deepest trenches of the ocean. Alternative modes of operation include the system’s ability to act as a synthetic aperture, or to descend to the seabed, record and return to the surface at a later time. A 'Deep Sound Mark II' is currently under development, which uses four hydrophones for measuring the vertical and horizontal properties of the ambient noise field.
The next stage of this research is to deploy the instrument in the field and record data in a deep ocean trench. From this data set, the primary goals of the experiment will be accomplished; to measure spatial coherence (directionality), intensity, attenuation and absorption over a large range of depths and a large bandwidth. Secondary goals of this research are the measurement of environmental parameters through ambient noise and exploiting the free falling nature of Deep Sound to perform synthetic aperture processing. |
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Summary of Facility Requirements: |
The facility requirements on board the Melville will be minimal. Storage space for both instruments will be required, each with a foot print of ~ 1 m^2. Deployment can either be done via a crane, A frame or small boat. On recovery, a telecommunications link in order to retrieve GPS co-ordinates broadcast by the instrument is required. An RF direction finder is also required for recovery. The physical retrieval of Deep Sound could be done either via a small boat or by grappling a tether or netting the instrument itself and hauling it on board using a crane or A frame.
During the deployment, the ships only requirement would be to generate the minimum amount of operation noise possible. |
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Summary of other requirements and comments: |
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Type of Request: |
Primary Ship Use |
Request Status: |
Submitted |
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Request ID: |
1002625 |
Created By: |
David R. Barclay |
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Date Last Modified: |
1/9/2009 5:45:00 PM |
Date Submitted: |
1/9/2009 5:45:00 PM |
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Year: |
2009
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Ship/Facility: |
Melville
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Optimum Start Date:
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10/1/2009 |
Dates to Avoid: |
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Earliest Start Date: |
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Multi-Ship Op: |
No |
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Latest Start Date: |
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Other Ship(s): |
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Operating Days Needed: |
Science Days |
Mob Days |
De-Mob Days |
Estimated Transit Days |
Total Days |
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1 |
0 |
0 |
0 |
1 |
Repeating Cruise?
(within same year) |
No |
Interval: |
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# of Cruises: |
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Description of Repeating cruise requirements: |
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Justification/Explanation for ship choice, dates,
conflicts, number of days & multi-ship operations: |
Dates and ship choice reflect the existing schedule. |
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Short Description of Op Area
for use in schedules: |
Stationary |
| Description of Op Area: |
The ship will remain stationary during the deployment. Some maneuvering will be required to recover the instrument. |
| Op Area Size/Dia.: |
less than 10 |
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Lat/Long |
Marsden Grid |
Navy Op Area |
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Beginning
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Ending
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Foreign Clearance Required? |
No |
Coastal States:
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 Important Info on Foreign Research Clearances
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Are you or any member in your science party bringing in any science equipment items which are regulated for export by the International Traffic in Arms Regulations (ITAR) and/or the Export Administration Regulations (EAR)?
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No |
If yes, have you applied for the necessary permits through your export control office?
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No |
| Questions about ITAR/EAR regulations?
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Comments about foreign clearance requirements or
description of any other special permitting requirements
(e.g., MMPA, ESA, IHA, Marine Sanctuaries, etc.) |
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Requested Start Port |
Intermediate Port(s) |
Requested End Port |
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None |
None |
None |
Explanation/justification for requested
ports and dates of intermediate stops
or to list additional port stops |
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Important Info on Working in Foreign Ports
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Chief Scientist: |
David R. Barclay, SIO |
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# in Science Party |
1 |
# of different science teams |
1 |
# Marine Technicians to be
provided by ship operator:
(include in science party total)
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1 |
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Explanation of Science Party Requirements and Technician Requirements |
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 Dynamic Positioning | ADCP | Multibeam | Seismic |
| Dredging/Coring/Large Dia. Trawl Wire | Stern A-frame | Fiber Optic (.681) | 0.680 Coax Wire |
| SCUBA Diving | Radioisotope use - briefly describe | NO Radioisotope use/Natural level work | Other Operator Provided Inst. - Describe |
| 0 PI-Provided Vans - briefly describe | MOCNESS | | |
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Explain Instrumentation or Capability
requirements that could affect choice
of ship in scheduling. |
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Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
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