Toulouse 2002 Dunedin Lyttelton Wellington Auckland long-term sea level records long-term sea level records for tectonic for tectonic uplift uplift u u sing sing continuous GPS continuous GPS observations observations Paul Denys Paul Denys John Beavan John Beavan Dion Matheson Dion Matheson Mikael Denham Mikael Denham Chris Pearson Chris Pearson John Hannah John Hannah
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Paul Denys John Beavan Dion Matheson Mikael Denham Chris Pearson John Hannah
Correcting New Zealand ’s long-term sea level records for tectonic uplift u sing continuous GPS observations. Auckland. Paul Denys John Beavan Dion Matheson Mikael Denham Chris Pearson John Hannah. Wellington. Lyttelton. Dunedin. AUCK & TAKL. Sites with ~100 years of TG records - PowerPoint PPT Presentation
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Toulouse 2002
Dunedin
LytteltonWellington
Auckland
Correcting New ZealandCorrecting New Zealand’s’s long- long-term sea level records for term sea level records for
Tide Gauge Site Stability Monitoring Tide Gauge Site Stability Monitoring
• Local stability:Local stability: TG pole/recorder to local benchmarksTG pole/recorder to local benchmarks• Regional stability:Regional stability: CGPS@TG to regional CGPSCGPS@TG to regional CGPS
• Located on Captain Cook Located on Captain Cook Wharf, AucklandWharf, Auckland
• Tide gauge measurement Tide gauge measurement system uses microwaves system uses microwaves reflected off sea surface reflected off sea surface beneath wharfbeneath wharf
• Reference surface of tide Reference surface of tide gauge is immediately gauge is immediately adjacent to base of GPS adjacent to base of GPS antennaantenna
Tide Gauge mountedunder this cover
CGPSantenna(TAKL)
Base of antenna mast firmly
bolted to wharf
Toulouse 2002
GPS receiver
Industrial PCon internet
Power Supply/ Battery charger
Back-up battery
CGPS Receiver at Ports of AucklandCGPS Receiver at Ports of Auckland
Toulouse 2002
Automatic tide gauge Manual gauge
Measuring system at Wellington float-type tide Measuring system at Wellington float-type tide gaugegauge
New Zealand’s CGPS @TG New Zealand’s CGPS @TG ProjectProject
• CGPS installed at 4 CGPS installed at 4 long record TG long record TG locations locations
• CGPS collocated or CGPS collocated or within 600mwithin 600m
• Site stability monitored Site stability monitored using a variety of using a variety of methodsmethods• Precise levelling to close Precise levelling to close
BMsBMs• GPS “levelling” to GPS “levelling” to
regional CGPS and TG regional CGPS and TG BMBM
• CGPS to CGPS @TG CGPS to CGPS @TG stabilitystability