in figure 11„22 and tabulated, in Table 11.6. Temporarily let all of this 

 energy be assigned to the first quadrant. The contribution from the swell 

 as given in Table llo7 then belongs in the third quadrant. Tables 11.6 and 

 11.7 were then recombined separately to provide estimates of each of these 

 contributions to a square area in the U(r, s) plane. The values due to the 

 swell were mapped by reflection through the origin into the third quadrant. 



The minj.ma indicated in Table 11.6 were then assumed to be one ex- 

 treme in tlie angular range of the sea. A line forming an angle of about 30° 

 with the positive vertical axis could then be determined. Those values of 

 U(r, s) between this line and the vertical axis were then transferred to the 

 third quadrant. 



The final spectral estimates in the U{r5 s) plane are shown in figure 

 11.27. The values should be divided by 10^ to put them in units of (ft) . 

 The range of directions toward which the spectral components are travel- 

 ing varies from 80° to 320°. The sea has components traveling toward 

 directions ranging from 80° to 260°. The swell is traveling toward di- 

 rections ranging from 240° to 320 . 



The quantities shown in this figure have been obtained by applying 



corrections for the effects of column noise ajid white noise to the original 



data and by expanding the spectrum to a range of more than 180° from 



considerations of the local wind direction and the geography of the area 



where the data were obtained. The effects of curvature do not seem to be 



very greats The values at the origin must be excluded, and perhaps the 



221 



