?2- 



0.4 0.6 0.8 

 frequency (hz) 



0.6 0.8 



frequency (hz) 



Run o0509a 

 Gage fl 



Hmo - 0.45 

 Hl/3 - 0.42 



1.0 



.2 





Low pas 

 Hmo 

 Hl/3 - 











22 



21 



1.0 1.2 1.4 



high pass 



Hmo - 0.39 



Hl/3 - 0.41 



0.6 0.8 



frequency (hz) 



Figure 4-4. Smoothed wave spectra from Gauge A, Run A0509A 



located approximately 2.7 m landward of the still-water shoreline, about mid- 

 way up the beach face between the still-water shoreline and the runup limit. 

 The maximum runup, the runup limit, reached an elevation of about 0.8 m 

 above the still-water level in this case. 



Figure 4-5 shows the wave record after the initial voltage offset has been 

 removed. Once again, the original wave record has been smoothed by 

 plotting only every fourth data point. The low-frequency signal, based on 



86 



Chapter 4 SUPERTANK Swash Measurements 



