Plunge Distance 



144. After measurements of breaker height, breaker depth, and breaking 

 location were made for monochromatic wave tests, the videotape was advanced to 

 the plunge point, and plunge distance was measured. Plunge distances were 

 averaged for the same waves that breaker height and depth were measured. 

 Occasionally, the plunge point was obstructed from the video camera by tank 

 wall supports. In these cases, the plunge distance was averaged for the 

 number of unobstructed observations that could be made. Figure 45 shows 

 plunge distance normalized by breaking wave height as a function of £ . The 

 solid line drawn through the data by visual fit represents the following 

 equation: 



= 0.63£" 



+ 1.81 



(89) 



It 



for 0.29 < £ < 3.46 . 



6.0 



5.0 



4.0 



3.0 



2.0 



Xp/Hb 



1.0 









Barred Profiles 



- 







Plane Slopes 



■ 









\ ■■■ 





'-"--_..„ 





8 \ a 



«°» 



■ 



° ~ 



I 



■ 



I 



" 



I I I 



0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 



4 



Figure 45. X p /H b as a function of £ 



99 



