wave periods in shallower water. Therefore, initial tests were conducted 

 with period depth combinations that are in the minimum stability range. 



The amount of groupiness in a series of waves is influenced by the 

 spectral width parameter (y). Previous work has shown that groupiness in- 

 creases as gamma increases and the spectra become narrower or more 

 sharply peaked. Therefore, tests were initiated using gamma values of 1, 

 10, and 20. 



Chapter 1 Introduction 



