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ID 05044
Also Known As 05044
F-1-05-SR
Abstract United States Geological Survey, Woods Hole, Massachusetts. Chief Scientists: John Bratton, Paul Gayes, Coastal Carolina Univ.. Data (navigation) of field activity 05044 (F-1-05-SR) in South Carolina, United States, North America, Atlantic Ocean from 10/16/2005 to 10/20/2005
Organization United States Geological Survey, Woods Hole, Massachusetts
Project/Theme Coastal Groundwater Systems
Coastal Change Hazards
Chief Scientist John Bratton
Paul Gayes
Platform Nancy Foster
Area of Operation South Carolina, United States, North America, Atlantic Ocean, South Carolina
Bounding Coordinates
34.00000
-79.25000     -78.00000
33.00000
Ports OCT 16, 2005 - Charleston, SC
OCT 20, 2005 - Myrtle Beach, SC
Dates 10/16/2005 (JD 289) to 10/20/2005 (JD 293)
Analog Materials No analog holdings.
Information Specialist
John Bratton
Crew
John Bratton Chief Scientist
Paul Gayes Coastal Carolina Univ., Chief Scientist
Emile Bergeron operating electrical resistivity system
Rich Viso CCU
Tammie Middleton CCU;
Commander James Verlaque Captain
Equipment Used
navigation
Purpose
Electrical resistivity surveying in
Information to be Derived
Sub-bottom electrical resistivity
Summary
Survey dates:16 to 20 October 2005
Area of survey: Inner continental shelf from
Charleston to Myrtle Beach, South Carolina.  The
equipment arrived in Charleston on October 15,
and was installed on the ship and tested.  All
was in good working order with the exception of
the depth sounder.  Due to the size of the boat
it was not possible to install the depth sounder
head.  The ship left the NOAA pier at 10 a.m.
Sunday, October 17 to steam to the first survey
site.  Upon arriving on site and powering the
survey gear it was found that the Lowrance GPS
unit had failed.  Because the navigation
information is an integral part of the survey,
Emile Bergeron attempted to feed the navigation
string that was being supplied by the bridge
into the SuperSting resistivity logging unit.
This caused the SuperSting unit to behave in a
very bizarre way.  The navigation information
being supplied was so garbled that it caused all
data and configuration files in the unit to be
overwritten with random characters.  It took
several hours to figure out what the root of the
problem was.  Once solved,  the SuperSting unit
was set up to operate without  a navigation
feed, and navigation data were logged remotely
on a laptop.  It was determined after the fact
that during these adjustments the bad navigation
string had caused the clock to reset to
midnight, January 2, 2000.  Survey lines L1
through L5 had this time offset.  Navigation
continued to be a problem when Hypack stopped
recognizing the navigation information.  The
sonar technician from Coastal Carolina
University set up an Ashtech GPS unit and this
data was then fed to both Hypack and the
SuperSting logging computer.  The time and date
on the SuperSting unit were reset to GMT at this
point.    The survey continued without any major
difficulties with the exception of battery power
for the resistivity equipment.  Since surveying
was being done around the clock, the batteries
used to power the SuperSting unit never had time
to properly charge causing the unit to shut
down, sometimes after only a minute of
surveying.  Batteries from the ship and those
brought by Coastal Carolina were brought into
use in an attempt to keep going.  An
insufficient number of battery chargers,
however, made it a battle of diminishing
returns.  In the end 10 batteries were being
used, all with questionable charge status.  Upon
returning to Woods Hole Emile Bergeron called
Lowrance about the failed GPS head and was
informed by them that the particular unit used
would fail if placed too close to a radar unit.
The head as installed on the ship was no closer
than 30 feet to the ship's radar. Lowrance has
repaired this problem and will replace our unit.
All the navigation files that were logged
remotely had to be converted from $GPGGA to
$GPRMC as the AGI software will only recognize
$GPRMC.  This was a tedious process, especially
for the files that were logged using the ship's
navigation, as the files contained not only
$GPGGA but GPZDA, GPZTG, GPGGL, GPGSV, GPVTG,
GPZDA, and GPBWC.  The files were also corrupt
which made editing them all the more difficult.
The survey consisted of two long shore-parallel
lines with several shorter crossing lines, and a
small grid further offshore.  A total of 326 km
of continuous resistivity profiling survey lines
were collected, with a minimum line length of 89
meters and a long line of 13,398 meters.  That
includes 58 lines over 900 meters long.  The
small mosaic area lines in the offshore area
where wells have been previously installed by
Billy Moore (Univ. of South Carolina, emeritus)
were all about 1000 meters long, but data
quality was low.  Note that CCU scientists
collected seismic data simultaneously.  USGS was
not involved in collecting or processing these
data.  A post-cruise meeting to review processed
resistivity results took place in Woods Hole on
January 10-11, 2006.  In attendance were Paul
Gayes and Rich Viso from CCU, and John Bratton,
VeeeAnn Cross, and Wayne Baldwin from USGS.
Notes
equipment used:
AGI SuperSting Continuous Resistivity
Profiling System with 100-m streamer and
shipboard streamer extension
Seismic surveying instruments
Got Help? For 05044, we would appreciate any information on -- activity type, analog materials, contract, days at sea, dive count, funding, kms of navigation, national plan, NGDC Info, owner, project number, publications, scanned materials, seismic description, station count, station description, submersible, tabulated info.
Type Webpage KMZ Arc         Metadata         WHSC
Metadata data     txt  data  FAQ  xml data
Navigation data nav      
Resistivity       data
Times   050.times      

05044 location map of where navigation 

equipment operated

 
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