Summary of breaker depth 



39 . The variables involved in determining breaker indices are local 

 bottom slope and deepwater wave steepness. Table 1 lists coefficients (C 1 and 

 C 2 ) and exponents (^ and n 2 ) of the different breaker depth equations 

 described previously for comparison, where the basic equation is of the form: 



7 b = C im ni 



"2 



+ c 2 



(33) 



Equation 58, based on data collected from previous studies, was developed in 

 the present study and is described at the end of this chapter. 



Table 1 



Summary of Coefficients and Exponents for 



Breaker Depth Index 



Source 



McCowan (1891) 



Galvin (1969) 



Collins and 

 Weir (1969) 



Weggel (1972)** 



Singamsetti and 

 Wind (1980) 



Sunamura (1981) 



Present Study 











Equation 



Ci 







c 2 



n 2 



Number 







0.78 

















1.09 







16 











f(m)* 







17 



5.6 



1 



0.72 







18 



-a(m) 







b(m) 



1 



24 



0.568 



0.107 







-0.237 



29 



1.1 



0.167 







-0.083 



30 



-a(m) 







b(m) 



1 



58 



* f(m) = function of beach slope. 

 ** H b assumed equal to H . 



40. Figure 5 (a-d) shows a graphical comparison of the different 

 breaker depth equations as a function of deepwater wave steepness for slopes 

 of 1/10, 1/20, 1/40, and 1/80. To include Equation 24 (Weggel 1972) in Fig- 

 ure 5 (a-d) , H b was set equal to H . Equation 29 was plotted within the 

 limits specified by Singamsetti and Wind (1980). Equations 16, 17 (Galvin 

 1969) , and 18 (Collins and Weir 1969) are functions of beach slope only and 

 give a constant value of 7 b regardless of deepwater wave steepness. 



25 



