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Jon Feb Mor Apr May Jun Jul Aug Sep Oct Nov Dec 

 Dote During 1980 



Figure 3. Amplifier zero drift during 1980 (arrows indicate 

 when amplifiers were reset to 0.0 cm) 



and analysis. The manufacturer states that wave amplitudes are correct within 

 3 percent of their true value for frequencies between 0.065 and 0.5 Hz (i.e., 

 wave periods between 15 and 2 second). For frequencies as low as 0.03 Hz 

 (i.e., for a 33-second period), the manufacturer provides a frequency response 

 curve which must be used to maintain the 3 percent accuracy. The frequency 

 response curve was not used for the data in this report since wave periods 

 greater than 17 seconds were never observed. 



27. Datawell recommends that Waverider buoys be cleaned and new batter- 

 ies installed at least every 9 months. The buoys were replaced with cleaned, 

 repainted, and calibrated buoys in October 1979 and August 1980. The buoys 

 were calibrated at the Engineering Support Offices, Ocean Wave Instrument 

 Facility, National Oceanic and Atmospheric Administration (NOAA) (Ribe 1981). 

 Considerable biological growth occurs during the summer months when the water 



15 



