SPECTRAL STABILITY NUMBER Ns- 



Figure 11. Crest height reduction factor versus spectral stability 

 number for stability subsets 1, 3, 5, 6, and 9 



Figures 12, 13, 14, 15, and 16 were prepared to compare observed data for sub- 

 sets 1, 3, 5, 7, and 9, respectively, with synthetic data trends generated by 

 the stability model. Figures 12 through 16 show h /d versus N* with 

 synthetic trends for each subset generated using A and d from Table 2 



and h'/d from Table 4. Values of h /d were generated at integer values 

 c s c s 



of N* for a range of N* about the same as observed within each subset. 

 Synthetic damage trends comprise the type of information that could be gen- 

 erated by a user of the stability model. In general, synthetic trends follow 

 observed data trends very well. Discrepancies between predicted and observed 

 values appear to occur because the stability model does not include the bulk 

 number. 



25 



