6 



P*' 0-05 











. >= 1 









- 



A 



^^=<h 







- 



J^ 



-—7?-^ 



^. 





- 



/ 





^ 



Kw 



- 



/ . , 



' 





.^::^ 



5 



0.2 04 06 08 1.0 1.2 

 X 



Fig'jre 29. Dimensionless theoretical current profile with mixing 



parameters P*= 0.5, 0.1, and 0.05 as a function of incident 

 breaker angle. Maximum velocity and its location decrease 

 with increasing angle (from Kraus and Sasaki, 1979). 



and spread the current profile. Figure 29 reveals that larger breaker angles 

 have the same effect for a given P* value. The overall profile shape is stll] 

 maintained but lowered as a, increases. At first glance this result (and 

 that above for no mixing) appears to contradict the original model theory 

 and intuition. The longshore current is expected to increase as a^ increases. 

 In fact_, this does happen since the product sino, cosa, in the reference, ve- 

 locity v^ increases much faster than the decrease in dimensionless V as a^ 

 increases. 



105 



