Technical Aspects of the Canadian Wave Measuring Program JCOMM Technical Workshop on Wave Measurements from Buoys – New York, U.S.A October 2 & 3, 2008
Mark Blaseckie – Technical Field Services AXYS Technologies Inc. – Sidney, BC, CANADA
Canada
Canadian Buoy Network • Locations of Environment Canada Buoys • Platform Types • Mooring Types • Sampling • Processing
Canada
Watchman 100 Payload • Components are similar on all buoys • Layout differs with platform
Canada
Wave Sensors • Strapped Down Accelerometer – Most Platforms
• TRIAXYS Direction Wave Sensor – Currently installed in two systems
Canada
Strapped Down Accelerometer • Jewell LCF-200-2G • Accelerometer Interface PCB converts acceleration to displacement • ± 15m
“TRIAXYS” Data Acquisition Cycle • 10 minute Wave • 10 minute Wave & Met Sampling • 40 minute Sleep
Canada
Watchman Wave Processing • • • • • • • • • •
8 * 256 one second samples taken Mean of the valid raw data is removed 10% cosine taper is applied FFT Calculated on the block Spectrum is Calculated Spectrum is corrected for the cosine taper Spectrum between 2 and 30 seconds is corrected for the transfer function of the heave sensor Band Averaging is done to reduce the number of spectral bands Hs and Tp are calculated (LFC is applied to shallow buoys) Results of the 8 blocks are averaged
Canada
TRIAXYS Wave Processing • 4 Hz sampling • 20 minute Sample • Data processing is performed in the sensor by proprietary software developed by the Canadian Hydraulics Centre (CHC) of the National Research Council of Canada. • Can be mounted off centre • Raw data can be logged on board • Results are read by the Watchman and formatted for GOES transmission
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Joao A. Lorenzzetti ([email protected] ). • Representative(s) from Korea, Australia, Mediterranean, India. Secretariat support will be provided by WMO and IOC.
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JCOMM Technical Workshop on Wave Measurements from Buoys. 2-3 October 2008, New York, 2008. ⢠GPS basics. ⢠Error budgets. ⢠Application to wave ...
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particularly directional spectra. More spectral, better 2-D, data needed, encourage ..... performance of wave measurement systems given the wide spectrum of ...
