Table 8. Summary of calculations of reflection and transmission 



coefficients of equivalent rectangular breakwater based on 

 AH /AH_ given by equation C161). 





^I 



AH /AH„ 

 e 1 



e 



f 





-^1 



^I 



Run 



Table 7 





Ceq. 172) 





f/s. 







No. 



feet 



Ceq. 161) 



feet 



Ceq. 57) 





(Fig. 2) 



(Fig. 3) 



428 



0.015 



0.55 



1.39 



2.34 



2.5 



0.39 



0.62 



429 



0.016 



0.55 



1.39 



2.39 



2.6 



0.38 



0.62 



472 



0.0175 



0.55 



1.39 



2.53 



2.7 



0.38 



0.63 



430 



0.020 



0.55 



1.39 



2.64 



2.8 



0.36 



0.64 



427 



0.024 



0.55 



1.39 



2.85 



3.1 



0.34 



0.66 



471 



0.032 



0.56 



1.41 



3.24 



3.5 



0.32 



0.68 



470 



0.049 



0.56 



1.41 



3.87 



4.2 



0.28 



0.72 



469 



0.069 



0.57 



1.44 



4.55 



4.9 



0.24 



0.74 



465 



0.085 



0.57 



1.44 



5.08 



5.5 



0.22 



0.76 



466 



0.109 



0.57 



1.44 



5.73 



6.2 



0.20 



0.78 



467 



0.130 



0.57 



1.44 



6.27 



6.7 



0.18 



0.79 



468 



0.157 



0.57 



1.44 



6.87 



7.4 



0.17 



0.80 



IVhereas the reflection coefficient is essentially insensitive to 

 the value of Iq it is seen from Tables 7 and 8 that the transmission 

 coefficient shows a significant change with the value of the equivalent 

 breakwater width. The transmission coefficients obtained in Table 8 

 are considerably larger than the transmission coefficients obtained in 

 Table 7, thus reflecting the smaller equivalent breakwater width. Since 

 the equivalent breakwater width was obtained from equation (172) using 

 the slightly conservative value of R^ obtained in Table 6, it may be 

 anticipated that the equivalent breakwater width listed in Table 8 is on 

 the lower side. Consequently, one may anticipate that the estimates of 

 the transmission coefficients obtained in Table 8 are slightly on the 

 high side. 



The preceding discussion essentially shows that the reflection 

 coefficient, Rj, may be regarded as relatively accurately determined 

 whereas the transmission coefficient, T , is bracketed by the results 

 listed in Tables 7 and 8. 



95 



