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This study revieu'S the state-of-the-art techniques for transformation of 

 nonochromatic surface gravity waves from deep to shallow water over a varying 

 bathyraetry. Nonlinear effects are considered and particular emphasis is put 

 on the determination of breaking wave characteristics. 



For a .^lane sloping bottom, a new "hybrid" wave theory is introduced which 

 gives improved results for breaking characteristics as compared with existin-j 

 theories. This hybrid theory uses cnoidal wave height transformation and 

 linear wavelength transformation. Nomographs are presented for easy determi- 

 nation of breaking wave angles and other characteristics such as depth, wave 

 height, and wavelength from given deepwater characteristics and bottom slope. 



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