Bathymetry/depth measurements made at Long Fjord, Vestfold Hills by drilling through sea ice
Entry ID: Long_Fjord_Depth_Measurements_2007

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Summary
Abstract: Water depth measurements were taken in Long Fjord during early winter in 2007. The measurements were collected by Graham Cook, station leader at Davis Station in the Australian Antarctic Territory. The measurements were made by dropping a weighted line off the back of a quad bike, after drilling a hole through the sea ice. Measurements were made approximately every 100 metres.

The download file contains a csv spreadsheet which lists each waypoint, plus the corresponding water depth and any comments. The text file contains the waypoint information collected by the Garmin GPS unit. Data in the text file are comma separated and are interpreted as follows:

WP,D,001 (waypoint) , -68.51341000, 78.06903000,(Latitude and Longitude) 05/25/2007, 10:25:35, (Date and time Downloaded to Computer) 24-MAY-07 11:40:42 (Date and time of reading). Time is in local time.

Vegetation was found on the weight that we used when we first started at the seaward end of the Fjord and then again in shallow water between Brookes Hut and a small island 800 or 900 metres out from Brookes. The weight is quite smooth and does not pick up a lot.

The reference given below provides some further information about previously collected bathymetry data in Long Fjord. Furthermore, also see the metadata records:

&Bathymetric data of Long and Tryne Fjords at Vestfold Hills, Antarctica, collected in December 1999 [VH_bathy_99]&

&Interpolated bathymetry of Long and Tryne Fjords, Vestfold Hills, Antarctica [long_tryne_bathy]&

The fields in this dataset are:
Waypoint
Latitude
Longitude
Water Depth
Date
Time

Related URL
Link: GET DATA
Description: Download point for the data - excel spreadsheet, text file


Link: GET RELATED DATA SET METADATA (DIF)
Description: Bathymetric data of Long and Tryne Fjords at Vestfold Hills, Antarctica, collected in December 1999


Link: GET RELATED DATA SET METADATA (DIF)
Description: Interpolated bathymetry of Long and Tryne Fjords, Vestfold Hills, Antarctica


Link: VIEW RELATED INFORMATION
Description: Citation reference for this metadata record and dataset


Geographic Coverage
 N: -68.51341 S: -68.54131  E: 78.18976  W: 78.06903
 Min Depth: 4.1 M  Max Depth: 141.5 M

Temporal Coverage
Start Date: 2007-05-24
Stop Date: 2007-05-24


Location Keywords
OCEAN > SOUTHERN OCEAN
CONTINENT > ANTARCTICA > Vestfold Hills
CONTINENT > ANTARCTICA > Long Fjord
GEOGRAPHIC REGION > POLAR


Data Resolution
Vertical Resolution: 30 cm


Science Keywords
BIOSPHERE >VEGETATION    [Definition]
CRYOSPHERE >SEA ICE    [Definition]
OCEANS >BATHYMETRY/SEAFLOOR TOPOGRAPHY >WATER DEPTH    [Definition]
OCEANS >COASTAL PROCESSES >FJORDS    [Definition]
OCEANS >MARINE SEDIMENTS    [Definition]
OCEANS >SEA ICE    [Definition]
OCEANS >BATHYMETRY/SEAFLOOR TOPOGRAPHY >BATHYMETRY    [Definition]


ISO Topic Category
INLAND WATERS
OCEANS


Platform
FIELD SURVEYS    [Information]


Instrument
GPS >Global Positioning System    [Information]


Quality
Methodology:
A line reel was rigged up to sit on the back a quad (see picture in download file) to allow measurements to be taken without the need to touch the wet cord (a problem, even for gloved hands, in sub-zero temperatures). The measuring cord is nylon blind cord marked every metre with red heat shrink and then every ten metres with yellow heat shrink. There is some stretch in the cord but not much, (roughly 300mm over 100 metres with about 10kg of weight applied). Two weights were made up, one at 2 kg and one a little over 4 kg (the hope was to be able to use the lighter weight to reduce line stretch, but it may be affected more by currents, and cause the line to drift).

A gen-set was also available on the quad bike and was used to power a drill for making holes in the sea ice. In total, 60 holes were drilled at 100 metre intervals (using the odometer on the quad bike), and the location of each hole was recorded on a GPS. The line was then dropped, any slack was taken up and the bottom established before taking the measurement. The time was also recorded in case tidal variations need to be checked. We followed the travel routes up the Fjord to Brookes Hut taking cross measurements every 500 metres.

The setup worked well and took about 2 to 4 minutes per hole depending on water depth. Water depths varied from 3.6 metres between islands to 141.6 metres out from the entrance to the Fjord. There was very little sediment coming up with the weight and what did come up was either dark green vegetation or grey silt.

GPS measurements were collected using the WGS84 horizontal datum.


Access Constraints
These data are accessible from the URL given below. The download file contains an excel spreadsheet of water depths and waypoints, a text file with waypoint latitudes, longitudes, date and time, and several photos of the
process.


Use Constraints
This data set conforms to the PICCCBY Attribution License
(http://creativecommons.org/licenses/by/3.0/).


The investigator, technical contact and data centre must be acknowledged when using these data.


Keywords
Long Fjord
Water Depth
bathymetry
sea ice
drilling
Waypoint
Latitude
Longitude
Date
Time


Data Set Progress
IN WORK


Data Center
Australian Antarctic Data Centre, Australia    [Information]
Data Center URL: http://data.aad.gov.au

Data Center Personnel
Name: DATA OFFICER AADC
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: metadata at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia



Distribution
Distribution_Media: HTTP
Distribution_Size: 2.6 MB
Distribution_Format: csv, text, jpeg
Fees: free


Personnel
JOHN A.E. GIBSON
Role: INVESTIGATOR
Phone: +61 3 6226 7488
Fax: +61 3 6226 2973
Email: John.gibson at utas.edu.au
Contact Address:
IASOS
Private Bag 77
University of Tasmania
City: Hobart
Province or State: Tasmania
Postal Code: 7001
Country: Australia


GRAHAM COOK
Role: TECHNICAL CONTACT
Email: graham.cook at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia


DAVE J. CONNELL
Role: DIF AUTHOR
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: dave.connell at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia


Publications/References
Whitehead, J., McMinn, A. (1997) Paleodepth determination from Antarctic benthic diatom assemblages Marine Micropaleontology 29(3-4). 301-318

Creation and Review Dates
DIF Creation Date: 2007-06-05
Last DIF Revision Date: 2014-01-10

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