For Measuring 

 Incident Conditions 



22 m to Wove 

 Generotor 



Figure 6. Experimental setup in CERC's 0.4-meter-wide tank 



Table 1. Summary of CERC 



.aboratory test data. 





Wave tank 



Wave 



Bottom 



Test 



Data 





conditions 



slope 



setup. 

 Fig. No. 



xn 

 App. 



1.2 by 4.5 by 42.6 m 



Monochromatic 



Horizontal 



3 



A 



1.2 by 4.5 by 42.6 m 



Irregular 



Horizontal 



3 



B, C 



0.9 by 0.9 by 45.7 m 



Monochromatic 



Horizontal 



5 



A 



0.9 by 0.4 by 45.7 m 



Irregular 



Horizontal 

 and 1 on 30 



6 



D 



271 



tanh 



2Trd 



La 



(2) 



where T is the wave period and d the water depth. For sinusoidal blade 

 motion the restriction on the Ursell number was to eliminate the influence of 

 secondary waves; the cnoidal wave data were collected by Weggel (1976b) and 

 are discussed in Section 2. 



The irregular waves used in this study included a wide range of spectral 

 types and relative depths. Spectra were simulated by taking various theoreti- 

 cal spectra, such as Pierson-Moskowitz, Joint North Sea Wave Project ( JONSWAP) , 

 Bretschneider, and the six-parameter spectra of Ochi and Hubble (1976), and 

 slicing the spectra into 60 equal area segments with each segment represented 

 by a sinusoidal component at the frequency of the midpoint of the segment. 

 Each component was transformed into a piston blade motion using Biesel's 

 equation (Biesel, 1951) at the given frequency and assuming a random-phase 

 relation among the components. The time histories of the 60 components were 



15 



