graph of the time histories, the mean wave direction is defined by the frequency 

 band containing the greatest energy. Also included, are energy spectral densities, 

 mean wave directions, and RMS spreading angles measured by both buoys for most of 

 the runs. 



The bulk of the runs were made between Ik May and 18 May 1982, with only one 

 run each made on the 17th, 19th, 20th, and 21st. The date, time, and location for 

 each run can be found in Table 1 . 



The relationship between the wind speed and direction and the significant wave 

 height, modal wave period and mean wave directions can be seen in Figures 6 and 7. 

 Continuous time histories are displayed, but not every run was plotted. The runs 

 not included can be found in Table 1 . 



The energy densities, mean wave directions, and spreading angles for the two 

 buoys are presented in Figures 8 through 23. Tables of values for these three 

 categories from Delft University were not available to the authors, so the graphic 

 results were used. Scales were matched and the results of the Wave-Track buoy data 

 were overlaid on the WAVEC buoy data. The frequency range used in the DTNSRDC ana- 

 lysis is 0.01+7 hertz to 0.30 hertz. The Dutch analysis, performed by the 

 Department of Hydro-Instrumentation (DHl) of the Ministry of Public Works in the 

 Netherlands, uses a range of 0.05 to 0.50 hertz. The displayed frequency range has 

 been limited to O.k hertz. 



On the lUth of May, the significant wave height started out as measured at 1.5 

 meters. It slowly decreased by the last measurement of the day in accordance with 

 a generally decreasing wind speed coming from a steady direction of 170 degrees. 

 The modal wave period remained fairly steady at about seven seconds. 



On the 15th, the wind was fairly steady, still blowing in from 160 to 170 

 degrees. The wind speed remained fairly strong in the neighborhood of 12 meters 

 per second until shortly after 1800 GMT, when the wind dropped off and the direc- 

 tion shifted 90 degrees to the west. The significant wave height increased 

 steadily in accordance with the increased wind speed and steady direction. The 

 modal period started a little lower than it had ended on the lUth, but increased to 

 and hovered around eight seconds. This also is as expected with the stronger wind 

 than the previous day, for a steady direction. The measurements were made in the 

 same general area on the lUth and the 15th, as seen in Figure 5. 



On the l6th of May, the ship was west of the previous area (see Figure 5)- 

 During the measurements, the wind direction slowly shifted westerly to 210 degrees, 



