Scientific Reports
Scientific Reports
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id CAA11660 to ; Mon, 25 Oct 1999 02:09:00 GMT
Date: Mon, 25 Oct 1999 02:09:00 GMT
From: revelle!moe@sdsioa.ucsd.edu (Ronald L Moe)
To: shipsked@ucsd.ucsd.edu
Subject: HNRO12RR Cruise Report
Cc: capt@mpl.ucsd.edu, master@sdsioa.ucsd.edu, restech@sdsioa.ucsd.edu,
scg@sdsioa.ucsd.edu
Cruise Report
Hanharo 12 / LINKS 2
R/V Roger Revelle, Oct 9 - 22, 1999
Chief Scientist: Henry Perkins
Master: Al Arsenault
Marine Technician: Gene Pillard
Electronic Technician: Ron Moe
Type of Work: Physical Oceanography
Area of Operations: NP7 (Korea/Tsushima Strait)
Cruise Narrative
The cruise departed Pusan, Korea at about 2300 on 09 Oct, having been
delayed by a medical emergency with Marc Silver, the scheduled ET. The
prompt and effective action of Capt. Arsenault resulted in the arrival
of a replacement, Ron Moe, at very short notice. The ship returned to
Pusan at about 1700 on 22 Oct.
Bottom mounted ADCP moorings had been deployed during a Revelle cruise
in May, and the primary purpose of this cruise was to recover,
refurbish and redeploy them. The twelve moorings consisted of nine
from NRL and three from NAVOCEANO arranged as two lines of six
instruments each, one at the northern end of Korea/Tsushima Strait
(Sites N1-N6) and one at the southern end (S1-S6). Recovery was made
either by pop-up float or by a ballast-drop technique. The ship's
small boat was used for most of the recoveries, either to facilitate
attachment of a recovery line or to prevent loss of the ADCP
instruments, some of which were found to have lost a retaining bracket
while deployed.
Operations were carried out as planned except that the instrument at
site N1 did not surface. Inspection of the site by ROV near the end of
the cruise provided convincing, indirect evidence that the entire
platform had sunk out of sight into the soft mud found there.
Improvised dragging operations failed to dislodge it. Improved
dragging gear will be available for the final recovery cruise scheduled
for Revelle in March of 00.
Two additional moorings were deployed. One was at the originally
planned site C1 between Tsushima Island and Korea. The second, given
the name site N1.25 was one-fourth of the way between N1 and N2.
Bottom grab samples indicated a somewhat firmer bottom there than at
N1, and the oceanographic importance of the area made the risk
worthwhile.
CTD stations using a Sea Bird system rented from SIO were taken at all
sites along the N and S lines. Water samples for geochemical analysis
were also taken by KORDI scientists at these stations. They also
collected a large-volume sample by pumping at site S1.
This work would have been much more difficult and time consuming
without the special capabilities of the Revelle. The ship's Dynamic
Positioning System was extremely valuable for station-keeping during
mooring launches. It was also used extensively during ROV and dragging
operations, some of which were carried out in the presence of surface
currents of over three knots. The ship's Nautronix acoustic locating
system was also valuable for optimally positioning the ship during
mooring recoveries and during dragging operations.
On behalf of the scientific party, I would like to express my
appreciation of the expertise and professionalism of Captain Arsenault,
of the ship's officers and crew, and of the two resident technicians.
I would like to particularly acknowledge the exceptional support
provided by Gene Pillard, whose tireless efforts on deck and continual
attention to safe practices contributed substantially to the success of
this cruise.
Respectfully submitted,
Henry Perkins
This cruise is being funded by a grant from National Research Laboratory.
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