the trend of the other coefficients, linear regressions were made on C(m) 

 and n(m) for values obtained only on 1/50, 1/30, 1/20, and 1/10 slopes. The 

 resulting equation for flj, is: 



Ob = c < m ) 



(61) 



in which 



and 



C(m) 



0.34 + 2.47m 



(62) 



n(m) = 0.30 - 0.88m 



(63) 



for 1/50 < m < 1/10 and 0.007 < H /L < 0.0921 . The solid line in 

 Figure 13 (b-f) represents Equation 61. The equation shows good agreement 

 with the regression analysis for beach slopes of 1/10, 1/20, 1/30, 1/50. 

 Equation 61 underpredicts ^ for the 1/40 slope data, since C(l/40) was 

 much higher than the other C(m) values and not included in analysis. 



84. Overall, Equation 61 predicts breaker height index well, and it 

 also gives reasonable values compared with other breaker height equations 

 (Figure 6 (b-d)) . 



Plunge distance 



85. Plunge distance data were available from three sources covering 

 slopes ranging from 1/5 to 1/40. Figure 16 shows a comparison of the data set 

 with Equation 36 (Galvin 1969) . The trend in the data is underpredicted by 

 Equation 36 on all slopes except those pertaining to the Galvin experiment. 

 The large variation between maximum and minimum values at each slope indicates 

 plunge distance is not solely a function of beach slope. Plunge distance 

 normalized by breaking wave height was plotted versus the offshore surf simi- 

 larity parameter (Figure 17) . The solid line in Figure 17 was visually fit to 

 the data and represents the following relationship 



54 



