■ NCE STUDY 

 • SAJ STUDY 



, OBSERVED, CM 



Figure 8. FL^ predicted, using coefficients from NCE data 

 Kju observed, both NCE and SAJ studies 



a and b runup coefficients can be determined. By using regression analysis 

 on the combined data set, the improved coefficients are a = 1.154 and 

 b = 0.202 . A new scatter plot comparing predicted and observed values was 

 prepared with the above coefficients, and Equation 5 was used to calculate the 

 predicted values of maximum runup. The new scatter plot (see Figure 9) shows 

 that the change in the runup coefficients caused very little change over the 

 scatter plot shown in Figure 8. Even though there was little change in the 

 scatter plot, the limiting value for R/H^ dropped from 6.9 to 5.7; the 

 limiting value for Equation 5 is given by the ratio of a to b . 



17. To investigate systematic error in predicting the maximum runup and 

 to identify possible ways to improve the prediction method based on the modi- 

 fied surf parameter £. , a series of error plots was made. In these plots, 



the percent error 



in predicting the maximum runup is defined as 



13 



