coefficients or variance-spectrum coefficients for each frequency or period. 



A less-accurate but also less-complicated procedure would be to apply a single 



correction to the wave height FL based on the peak-spectral wave period 



™o 

 T_ . For correction of amplitudes or derived parameters linearly related to 



amplitude, a correction factor F(T) can be obtained from the sum of the 



Datawell (DW) and difference error (d) by: 



^(T) = 1 . (DW . D) ^A2) 



which can be applied by multiplying the uncorrected amplitude by F(T) for 

 T . For correction of parameters related to the square of the amplitude 

 (i.e. total energy or variance spectrum coefficients), the following should be 

 used: 



f ^^0' = [l . (DW . D)] ' ^*3) 



7. To apply the correction, first the difference error between the 

 Datawell-predicted error and the error measured during calibration is deter- 

 mined. The Datawell-predicted error and the difference error are summed, and 

 the decrease in sensitivity (based on the wave period) is computed by adding 1 

 to the sum. 



8. To demonstrate the use of the calibration results, the Waverider 



buoy (620) located 3 km from shore recorded an fL of 4.7 m and a T 



"•o P 



of 10 sec on 25 March 1983. From Figure A1 and Table A3 with calibration 



results for 8 November 1983, buoy 66966, the difference error (d) for 10 sec 



is +0.001 (interpolating from Table A3). This difference error is added to 



the Datawell-predicted error DW = -0.0055 (Equation A1 minus 1.0), e.g., 



-0.0045 = 0.001 + (-0.0055) , and the sensitivity is computed by adding 1 or 



0.9955 = 1 + (-0.0045) . This sensitivity is used to correct the 



Hjp = 4.7 m, T = 10 sec as follows: 



o 



Corrected Hjjj = Uncorrected H^ Divided by the Sensitivity 



Q QQcir = 4.72 m (less than a 0.5 percent increase) 



A5 



