Hb/hb 



0.6 



0.00 



0.02 



0.04 0.06 



Ho/Lo 



0.08 



0.10 



Figure 12. Calculated values of 7 b for plane slopes 

 as a function of H /L 



(a-f) for each beach slope, represented by the solid line. 

 Breaker height index 



83. Breaker height index was plotted as a function of H /L for each 

 beach slope (Figure 13 (a-f)). A power law regression of ^ as a function 

 of H /L was made for each slope and is represented by the dashed line in 

 Figure 13 (a-f). The coefficient C(m) and exponent n(m) values obtained 

 from each regression were plotted versus beach slope in Figures 14 and 15, 

 respectively. The coefficients and exponents for the 1/80 slope and 

 1/40 slope do not follow the trend of the other data points. The majority of 

 data collected on the 1/40 slope are from one source (Singamsetti and Wind 

 1980) , and all data collected on the 1/80 slope are from Horikawa and Kuo 

 (1967). Singamsetti and Wind may have defined the breaking wave height and/or 

 break point differently than authors of other data sources. The 1/80 slope 

 experiment had a concrete bottom and was performed in a different tank from 

 the other experiments of Horikawa and Kuo (1967), which had a steel plate 

 bottom.* Since C(m) and n(m) for slopes of 1/80 and 1/40 did not follow 



* Personal Communication, 1986, Kiyoshi Horikawa, Professor, Department of 

 Civil Engineering, University of Tokyo, Tokyo, Japan. 



49 



