|
|
NE Shelf Freshwater
-
2009
-
Oceanus
|
|
|
|
Project Title: |
Collaborative Research: Stratigraphic Controls on Freshwater Beneath the Continental Shelf |
Project Status: |
Submitted |
|
Principal Investigator: |
Brandon Dugan, Rice |
Project Institution: |
Rice |
|
Project ID: |
101442 |
Version #: |
2 |
|
Date Submitted: |
2/8/2008 1:05:00 PM |
Created By: |
Brandon Dugan |
|
Date Last Modified: |
2/8/2008 1:13:00 PM |
URI Serial #: |
None |
|
Funding Agencies: |
NSF/OCE/ODP - 0824368 - Funded |
|
Summary of Field Work: |
We propose to collect high-resolution multi-channel (MCS) and chirp seismic data across the New England continental shelf, south of Martha’s Vineyard. We propose to image the Tertiary and Cretaceous units using the portable Scripps high-res MCS streamer (48-channel, 600-m streamer), and Lamont’s portable two generator/injector (GI) gun source, with a compressor capable of a 5-s firing interval. This system is well suited for shallow-water use and provides 2-5 m resolution to a depth of ~1 km. We will simultaneously tow an EdgeTech 512i system (WHOI's), which transmits and records a 0.5-12 kHz swept pulse (or chirp) with a nominal resolution of 10cm and depth of penetration up to 100m, depending on seafloor conditions. We will collect MCS and chirp data along five primary, shelf-perpendicular (dip) lines and at least eight shorter, shelf-parallel (strike) crossing lines. At an average ship speed of 4 kt it will take ~7.5 days to shoot this initial grid given excellent weather. We intend to tow the streamer and guns at 3 m, yielding quality data to 300 Hz. We thus require relatively calm seas, so we include 3 days of contingency time. The MCS data will be processed in real time at sea, producing SEG-Y gathers with geometry and better-than-brute stacks. Velocities for real-time stacking will be based on analyses of USGS Line 5 data prior to MCS acquisition. We will assess the shipboard MCS stacks and the chirp data as they are acquired to determine if the uppermost section is being adequately imaged. If so, we will complete a denser, nearshore grid with chirp lines, or simultaneous chirp and MCS lines if ship turns with the 600-m streamer are faster than we expect. If the nearshore, shallow section is not being adequately imaged with the chirp or the 600-m streamer, 2-gun data (e.g., if the chirp can not penetrate and the MCS resolution is low), we will complete the nearshore grid with 1 GI-gun shooting and a 100-m streamer, towing both at 2 m depth. In this case, it may be necessary to eliminate one pass of crossing lines, but we guarantee crossing lines through each of the proposed drill sites. Completion of the nearshore grid will round out 14 days at sea. Seismic data collection will be conducted in accordance with the requirements of the Marine Mammals Protection Act and the Endangered Species Act. We plan to collect seismic data during fall (2009) to avoid any possible danger to large marine mammals that are known to frequent this area in the spring. |
|
Summary of Facility Requirements: |
We will require use of a medium-sized UNOLS vessel (e.g., R/V OCEANUS), the portable Scripps high-res MCS streamer (48-channel, 600-m streamer), and Lamont’s portable two generator/injector (GI) gun source, with a compressor capable of a 5-s firing interval. |
|
Summary of other requirements and comments: |
|
|
|
Type of Request: |
Primary Ship Use |
Request Status: |
Submitted |
|
Request ID: |
1001870 |
Created By: |
Brandon Dugan |
|
Date Last Modified: |
2/8/2008 1:13:00 PM |
Date Submitted: |
2/8/2008 1:05:00 PM |
|
|
Year: |
2009
|
Ship/Facility: |
Oceanus
|
|
Optimum Start Date:
|
8/15/2009 |
Dates to Avoid: |
|
|
|
|
|
|
|
Earliest Start Date: |
7/15/2009 |
Multi-Ship Op: |
No |
|
Latest Start Date: |
10/15/2009 |
Other Ship(s): |
|
|
|
Operating Days Needed: |
Science Days |
Mob Days |
De-Mob Days |
Estimated Transit Days |
Total Days |
|
14 |
2 |
1 |
0 |
17 |
Repeating Cruise?
(within same year) |
No |
Interval: |
|
# of Cruises: |
|
|
|
Description of Repeating cruise requirements: |
|
Justification/Explanation for ship choice, dates,
conflicts, number of days & multi-ship operations: |
|
|
Short Description of Op Area
for use in schedules: |
|
| Description of Op Area: |
|
| Op Area Size/Dia.: |
|
|
|
| |
Lat/Long |
Marsden Grid |
Navy Op Area |
|
Beginning
|
41° 30' N
/
70° 36' W
map
|
|
|
|
Ending
|
39° 48' N
/
69° 48' W
map
|
|
|
| |
Show Degrees Minutes |
|
|
|
|
|
Foreign Clearance Required? |
No |
Coastal States:
|
 Important Info on Foreign Research Clearances
|
|
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)?
|
No |
If yes, have you applied for the necessary permits through your export control office?
|
No |
| Questions about ITAR/EAR regulations?
|
Comments about foreign clearance requirements or
description of any other special permitting requirements
(e.g., MMPA, ESA, IHA, Marine Sanctuaries, etc.) |
|
|
|
Requested Start Port |
Intermediate Port(s) |
Requested End Port |
|
Woods Hole, MA, USA |
None |
Woods Hole, MA, USA |
Explanation/justification for requested
ports and dates of intermediate stops
or to list additional port stops |
|
Important Info on Working in Foreign Ports
|
|
|
|
Chief Scientist: |
Brandon Dugan, Rice |
|
# in Science Party |
8 |
# of different science teams |
1 |
# Marine Technicians to be
provided by ship operator:
(include in science party total)
|
1 |
|
Explanation of Science Party Requirements and Technician Requirements |
|
|
 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 | | |
|
Explain Instrumentation or Capability
requirements that could affect choice
of ship in scheduling. |
Portable seismic system, using GI-guns from LDEO and 600-m hi-res streamer from SIO.
|
|
|
|
Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
Portable seismic system, using GI-guns from LDEO and 600-m hi-res streamer from SIO. |
|
