CONTENTS 



Page 



CONVERSION FACTORS, U.S. CUSTOMARY TO METRIC (SI) 5 



SYMBOLS AND DEFINITIONS 6 



I INTRODUCTION 7 



II BACKGROUND 8 



III SIMPLIFIED METHOD. 10 



1. Selection of f c 10 



2. Selection of a 10 



IV EXAMPLE PROBLEMS. 11 



V DISCUSSION. 13 



VI SUMMARY 13 



APPENDIX 



A PREDICTION CAPABILITY OF METHOD 15 



B METRIC VERSION OF TEXT TABLES.. 20 



TABLES 



1 Depth-controlled height, H (f c , h, 0.0081), as a function of 



lower frequency cutoff, f c , period, T, and depth, h. 9 



2 Values of (a/0.0081 ) 1/2 as a function of spectral peak frequency, 



f , period, T, and windspeed, u. 12 



