LIST OF FIGURES AND TABLES (Continued) 



IV-1 Coordinate system adopted 



for DPG analysis 41 



IV-2 Flow chart of DPG analysis program 51 



IV -3 Instrument tilt above the seafloor 5^ 



IV-'!4- Four roots of tangent (20) 6I 



rV-5 Simulated time record of water surface elevation. 6? 



IV -6 Raw energy spectra; Simulation 



Case 1 . Illustrates presence of three 



distinct wave trains 68 



IV-7 Non-weighted 7-coefficient Fourier series direc- 

 tional energy distribution. Simulation 

 Case 1. Illustrates presence of three, 

 distinct wave trains with different directions . . 69 



IV -8 Raw energy spectra; Simulation Case 2 71 



IV-9 Non-weighted 7-coefficient Fourier series 



directional energy distribution. Simulation 



Case 2. Illustrates good directional 



spectra agreement with slight differences 



due to leakage 72 



IV-10 Non-weighted 7-coefficient directional 



energy spectra; Simulation Case 3- Illustrates 



software inablility to clearly define two 



directions per frequency - waves of equal height . 73 



IV-il Non-weighted 7-coefficient directional 



energy spectra; Simulation Case 4. Illustrates 



software inability to clearly define two 



directions per frequency - waves of unequal height 73 



IV-12 Non-weighted directional energy spectra 



using the first seven directional Fourier 

 coefficients compared to the first five '^^ 



