Initial results from the Polaris Expedition to the Auckland Islands

Auckland Islands Expedition 2014
Emily Tidey
Auckland Islands
• NZ’s 4th largest Island
by land mass
• 7 islands
• Climate - cold, wet,
windy, cloudy
• 13th - 14th C Polynesian
settlement remains
• 1806 European
discovery by Captain
Abraham Bristow
• History of shipwrecks
Hydrographic Surveying
February 2014 voyage
Hydrographic Surveying
February 2014 voyage
Hydrographic Surveying
• Measurements taken:
• Depth using singlebeam echo sounder
• Guided Polaris into uncharted territory!
• Depth using interferometric techniques with C3D
• Sidescan imagery
• Tides
• Vessels used:
• Polaris II (GNSS, IMU, C3D)
• Moki (GNSS, SBES, SSS)
Hydrographic Surveying
asdsad
Hydrographic
Surveying
asdsad
Real Time SSS
asdsad
Real Time SSS
Kelp!
Hydrographic Surveying
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Tide data analysed and linked to shore control
Reduce depths using tide
Combine C3D and ES depth data
Plot bathymetry
Process SSS data
Plot SSS data with different reflective properties
highlighted
• Relate SSS data with grab sample data and replot
Other research
Future Research
• Watercolumn analysis of kelp growth on sills
• ADCP measurements
• Singlebeam survey of inland lakes
• Bring all data into a model including
hydrodynamic data to understand the processes
and habitats that exist in the Auckland Islands
today.
• Keep going back to get more!!
Acknowledgements
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Cheal Consultants
Department of Conservation (DOC)
Fugro BTW Ltd
Fugro Satellite Positioning Pty Ltd
Fugro Survey Pty Ltd
Land Information New Zealand (LINZ)
National Institute of Water and Atmospheric Research
(NIWA)
New Zealand Antarctic Research Institute (NZARI)
Sir Peter Blake Trust
Staff at the School of Surveying and University of Otago
Trimble Navigation NZ
Questions?