1.5 



1.0 



0.5 



0.0 



-0.5 



1.0 



1.5 



Hrms/h 











* 





* 















* 



* 





** 











* 





* 



I I I I I I I 



10 15 20 25 30 



Distance from Shoreline (ft) 



c. Case R8230 

 Figure 75. (Concluded) 



35 



40 



the results of the present study bring into question their conclusion that 

 H rms /h is constant through the surf zone on a barred profile. Sallenger and 

 Howd measured wave heights seaward of an inner bar, and Figures 72(a-c) to 

 75(a-c) show H rms /h- values are uniform seaward of the bar. Because 

 Sallenger and Howd apparently did not measure wave height shoreward of the 

 inner bar, they did not find a varying H ims /b. . 



167. Runup measurements for irregular waves were taken for 13 to 34 

 waves near the start of the test, prior to estimated re -reflection from the 

 wave board; therefore, the irregular wave runup data are not statistically 

 reliable. Average wave runup normalized by (H s ) is plotted as a function 

 of £ using the seaward angle /3 X in Figure 76. The predicted values by 

 Equation 55 (Ahrens 1981) are shown as the solid line. Equation 55 estimates 

 runup well for the plane-slope cases, but underpredicts the measurements for 

 tests with barred profiles. Runup normalized by (H s ) is independent of £ 

 for the barred profiles. Runup was plotted as a function of £ with the 

 1/30 slope used as the primary angle (Figure 77). Equation 55 gives good 

 results if the 1/30 slope is used in the surf similarity parameter. 



139 



