curves for (DW) = /A/ - 1 , the Datawell-predicted sensitivity decrease 

 error; the actual sensitivity does not decrease with period according to the 

 Datawell relationship given in Equation 1. 



Difference Error (d) 



5. Ribe (1981) presents tables of the difference error based on a least- 

 mean-squares-order polynomial in period T for a "best-estimate" difference 

 error d between the Datawell-predicted decrease in sensitivity and that 

 found from the actual buoy calibrations. 



6. In Tables Al through A9 , DW (Datawell difference) and d are tabu- 

 lated as functions of T for each buoy. Best accuracy is obtained by choos- 

 ing the calibration values nearest in time to the date of the measurements. 



Table Al 

 Waverider 66967 Calibration 8/1/80 



Period, sec 



2.0000 

 2.0317 

 2 . 0645 

 2.0984 

 2.1333 



2.1695 

 2.2069 

 2.2456 

 2.2857 

 2.3273 



2.3704 

 2.4151 

 2.4615 

 2.5098 

 2.5600 



2.6122 

 2.6667 

 2.7234 

 2.7826 

 2 . 8444 



Frequency, Hz 



0.50000 

 0.49219 

 0.48438 

 0.47656 

 0.46875 



0.46094 

 0.45313 

 0.44531 

 0.43750 

 0.42969 



0.42188 

 0.41406 

 0.40625 

 0.39844 

 0.39063 



0.38281 

 0.37500 

 0.36719 

 0.35938 

 0.35156 



Difference 



-0.0484 

 -0.0485 

 -0.0487 

 -0.0488 

 -0.0489 



-0.0491 

 -0.0492 

 -0.0494 

 -0.0495 

 -0.0497 



-0.0499 

 -0.0500 

 -0.0502 

 -0.0504 

 -0.0506 



-0.0508 

 -0.0510 

 -0.0512 

 -0.0514 

 -0.0517 



Datawell 



-0.0000 

 -0.0000 

 -0.0000 

 -0.0000 

 -0.0000 



-0.0000 

 -0.0000 

 -0.0000 

 -0.0000 

 -0.0000 



-0.0000 

 -0.0000 

 -0.0000 

 -0.0000 

 -0.0000 



-0.0000 

 -0.0000 

 -0.0000 

 -0.0000 

 -0.0000 



(Continued) 



A6 



