Table 5 presents a summary of some of the Important parameters derived from the 

 analysis of roll angle spectra. The first column gives the run number of each recording; 

 the second, an indication of the success (or failure) of the submarine in attempting to 

 hold to a fixed keel depth of 100 feet; and the next three, mean values of the peak-to- 

 peak roll angles in accordance with equations 8, 9, and 10. The last three columns 

 give mean values of peak-to-peak roll angles computed manually for comparison. The 

 agreement in most cases is good. 



Tables 6 and 7 summarize relative flow velocity data. Columns 3, 4, and 5 are 

 the mean values derived from spectrum relationships in accordance with equations 8, 

 9, and 10. Columns 6, 7, and 8 are the mean values obtained manually. The agree- 

 ment between the spectrum derived mean values and those computed manually is good 

 in most cases. 



CONCLUSIONS 



This report is concerned with the measurement and analysis of certain variables 

 applicable to oceanographic problems; the chief analysis tool is the energy spectrum. 

 Specific conclusions are: 



1 . The Sonic Surface Scanner method appears to be a reliable method of 

 obtaining surface wave records in the open ocean. 



2. Parameters derived from the estimated spectrum obtained by the Sonic Surface 

 Scanner compare reasonably well to similar parameters obtained by hindcasttng. 



3. As expected, the largest amplitudes of roll angle occur near the REDFIN's 

 resonant frequency. A secondary maximum, associated with frequencies of maximum 

 spectral energy of the surface wave motion, is observed in almost every roll angle 

 spectrum . 



4. Spectra of transverse relative flow velocities tend to exhibit two distinct 

 peaks: one at frequencies near the resonant frequency of the REDFIN, and a secondary 

 peak is well correlated with the surface wave motion. 



5. Spectra of longitudinal relative flow velocities exhibit maxima whose frequen- 

 cies are well -correlated with the frequency of maximum spectral energy of the surface 

 wave motion. 



39 



