



























J Denotes ± 1.0 std. dev. 

 about trend line 





































































- 1 - 







































U- 



















— ±- 

























H s /qTp 



Figure 1. Irregular wave runup parameters versus wave steepness 

 for a plane, smooth slope of 1 on 1, d s /H s > 3. 



Figures 2, 3, 4, 5, and 6, which are similar to Figure 1, show trend lines 

 for slopes of 1 on 1.5, 1 on 2, 1 on 2.5, 1 on 3, and 1 on 4, respectively. 

 The trend lines in Figures 1 to 5 are all of the general form 



— = Ci + C? j 



+ C- 



gTr 



(2) 



where R x represents R2 , R s , or R, and £.\, C2, and C3 are dimensionless re- 

 gression coefficients. In some cases C2 or C3 is zero; if C3 is zero the 

 trend line is straight. 



Since a calculator or a computer may be more convenient for calculating 

 the runup parameters than using the figures, Table 1 provides a tabulation of 

 the regression coefficients, along with some statistical parameters which can 

 be used to evaluate how well the curves fit the data. The standard deviation 

 is the standard deviation of the data about the trend-line curves and is shown 

 in Figures 1 to 6 to give an indication of the magnitude of the scatter about 

 the curves. The coefficient of variation is the standard deviation divided by 

 the mean value of R x /H s . Using the coefficient of variation to determine the 

 percent scatter indicates that R s /H s can usually be estimated within the range 

 of ±5 to 10 percent about the trend-line curves; R2/H s and R/H s can be esti- 

 mated witbin the range of ±10 to 15 percent about the curves. 



