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Lau Hydrophone
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2010
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Global
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Project Title: |
Collaborative Research: Assessment of T-wave Processes and Hydroacoustic Monitoring Capabilities in the Lau Basin |
Project Status: |
Submitted |
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Principal Investigator: |
DelWayne R. Bohnenstiehl, NCSU |
Project Institution: |
NCSU |
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Project ID: |
101480 |
Version #: |
7 |
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Date Submitted: |
2/13/2008 10:16:00 AM |
Created By: |
DelWayne R. Bohnenstiehl |
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Date Last Modified: |
7/30/2009 5:45:00 PM |
URI Serial #: |
None |
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Funding Agencies: |
NSF/OCE/MGG - 0825295 - Funded |
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Summary of Field Work: |
Modification 30 July 2009
Supplement approved to deploy 4 hydrophones near West Mata Volcano.
Deployment: Will require extending December 2009 cruise on R/V Revelle to a total of 8 at sea days, assuming Suva to Nukualofa Tonga Leg. Up to two of these days will be funded by NOAA-PMEL.
Recovery: Will require extending the summer 2010 cruise to a total of 13 days at sea days, assuming Suva to Suva Leg.
Modification Summer 2009:
This ship time request is modified to reflect the need for an earlier than anticipated recovery cruise. Deployment took place during MGL0902 (January, 2009) and will be completed on a scheduled December 2009 cruise on the R/V Melville. This modification does not impact those cruises.
Justification: Power consumption on the newest generation of Q-tech clocks (deployed on a subset of the instruments to allow signal cross-correlation and array processing) was shown during bench tests to be significantly greater than specified by the manufacturer. Consequently, the longevity of these instruments is limited to 18 months (as opposed to the 24 months stated in the original ship time request).
*** To insure that the clocks are still functioning on these instruments, recovery operations must begin no later than 15 July 2010. ***
Ship time requirements:
Option 1 (assuming the response hydrophone near the northern Lau eruption site can be recovered during Melville Cruise in December of 2009).
Total ship time needed for recovery and transit between stations = 7 days
Total transit time from Suva to the field area = 2 days
Total ship time needed from Suva = 9 days
Option 2 (assuming the response hydrophone near the northern Lau eruption site has not been previously recovered).
An additional 2 days are required for transit and recovery of this instrument.
Total ship time needed for recovery and transit between stations = 9 days
Total transit time from Suva to the field area = 2 days
Total ship time needed from Suva = 11 days
Mooring locations (deg, minutes)
M1 -22 22.0003 -177 0.8751
M2 -22 43.0139 -177 15.7004
M3E -20 25.497 -176 46.1343
M3N -20 25.0585 -176 46.962
M3S -20 26.5805 -176 46.9148
M3W -20 25.7443 -176 47.6512
M4 -17 34.3481 -177 17.9052
M5 -18 35.1884 -175 27.3785
M6 -19 44.9144 -175 35.3741
M7 -21 30 -176 26.6
Response phone - M8 -15 17.307 -174 9.0871
Suva Port location (deg, minutes)
-18 7 -178 25
Clearance Needed:
Tonga
Fiji |
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Summary of Facility Requirements: |
Ship board deep sea winch, or ship capstan with fast speed for recovery of mooring lines; A-frame and crane. Line lengths range from 1700-2500 m. |
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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: |
1001943 |
Created By: |
DelWayne R. Bohnenstiehl |
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Date Last Modified: |
7/30/2009 5:45:00 PM |
Date Submitted: |
2/13/2008 10:16:00 AM |
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Year: |
2010
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Ship/Facility: |
Global
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Optimum Start Date:
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6/20/2010 |
Dates to Avoid: |
Must be recovered by end of July 2010 due to battery life estimates (see below) |
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Earliest Start Date: |
4/1/2010 |
Multi-Ship Op: |
No |
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Latest Start Date: |
7/15/2010 |
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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10 |
2 |
1 |
3 |
16 |
Repeating Cruise?
(within same year) |
No |
Interval: |
2 years |
# of Cruises: |
2 |
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Description of Repeating cruise requirements: |
This ship time request is modified to reflect the need for an earlier than anticipated recovery cruise. See explanation under "Summary of Field Work". This requirement does not impact the deployment cruise in 2009.
*** To insure that the clocks are still functioning on these instruments, recovery operations must begin no later than 15 July 2010. *** |
Justification/Explanation for ship choice, dates,
conflicts, number of days & multi-ship operations: |
Ship time requirements:
Option 1 (assuming the response hydrophone near the northern Lau eruption site can be recovered during Melville Cruise in December of 2009 or earlier).
Total ship time needed for recovery and transit between stations = 7 days
Total transit time from Suva to the field area = 3 days
Total ship time needed from Suva = 10 days (plus 1 mob/demob = 12 )
Option 2 (assuming the response hydrophone near the northern Lau eruption site has not been previously recovered).
An additional 2 days are required for transit and recovery of this instrument.
Total ship time needed for recovery and transit between stations = 9 days
Total transit time from Suva to the field area = 3 days
Total ship time needed from Suva = 12 days (plus 1 mob/demob = 14) |
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Short Description of Op Area
for use in schedules: |
Lau basin |
| Description of Op Area: |
Southern Lau Basin and Eastern Lau Spreading Center |
| Op Area Size/Dia.: |
510 nm x 300 nm |
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Lat/Long |
Marsden Grid |
Navy Op Area |
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Beginning
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14° 30' S
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173° 0' W
map
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Ending
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23° 6' S
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177° 30' W
map
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Show Degrees Minutes |
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Foreign Clearance Required? |
Yes |
Coastal States:
Tonga |
 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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Suva Harbor, Fiji Islands |
None |
Suva Harbor, Fiji Islands |
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: |
DelWayne R. Bohnenstiehl, NCSU |
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# in Science Party |
7 |
# 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. |
Ship/Equipment Requirements:
Ship board deep sea winch, or ship capstan with fast speed for recovery of mooring lines; A-frame and crane. Line lengths range from 1700-2500 m.
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Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
Ship/Equipment Requirements:
Ship board deep sea winch, or ship capstan with fast speed for recovery of mooring lines; A-frame and crane. Line lengths range from 1700-2500 m. |
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