Battjes and SPM — mild slopes 



53. Similar dimensionless comparison plots can be made for the SPM and 

 Battjes' methods for mildly sloped structures. Figure 7-27 of the SPM (1984) 

 has several Q* - a points which have a corresponding wave steepness that 

 meets Battjes' breaking criterion for a 1:6 smooth-slope structure. Figure 16 

 shows the SPM and Battjes' method estimates for a 1:6-slope structure. The 

 total range of Battjes' k values is considered. 



54. Battjes' method estimates more overtopping than the SPM method, 



1 1 



H s /gT 2 = 0.014 



l-L/gT 2 = 0.0086 



BA TTJES 





I I 

 H s /gT 2 = 



= 0.0045 





VA battjes 



~ 





— 





I I 







I I 

 v H s /gT 2 = 0.0028 





v^\ BATTJES 



- 



\\\ 





\\v\ 



- 



HW " 



\\\ \ 





3 12 3 



DIMENSIONLESS FREEBOARD - F/H c 



Figure 16. Comparison of Battjes' and SPM methods for estimating 

 overtopping of a 1:6 smooth-slope structure 



30 



