02 04 06 08 1.0 



Ratio of Structure Width-to-Wavelength, W/L 



Figure 17. Comparison of theory versus experiment, determination 

 of effect of relative structure width, W/L, on 

 transmission coefficient, C t , for circular cylinder 

 (after Yamamoto, Yoshida, and Ijima, 1980). 



/ 7 7 7 7 7 7 7 77 7 / 



02 04 0.6 OS 1.0 



u Ratio of Structure Width-to-Wavelength, W/L 



Figure 18. Comparison of theory versus experiment, determination 

 of effect of relative structure width, W/L, on 

 transmission coefficient, C f , for rectangular 

 cylinder (after Yamamoto, Yoshida, and Ijima, 1980). 



As an example application of this numerical technique, a series of compu- 

 tations was performed to investigate how the mooring system affects the wave 

 attenuation of a specific floating breakwater structure (Fig. 19). The figure 

 shows the cross-sectional shape of two semicircles connected with parallel 

 sides and the various mooring configurations, where k is the spring constant 

 of the mooring system. Each body was filled with material of uniform mass 

 density so that the center of gravity was always at the center of the cross 

 section. The drafts were always kept at one-half of the heights of the struc- 

 tures for the free-floating condition. The calculated results of the trans- 

 mission coefficient are presented in Figure 19. Owing to the small mass and 



48 



