Table 1. Information used in numerical sample calculations. 





Prototype 



Froude Model 

 length scale 1 :25 



Incident Wave Amplitude 

 a in feet 



1.45 



0.058 



Wave Period 



T in seconds 



12.5 



2.5 



Water Depth 



h in feet 

 Q 



29.2 



1.167 



Incident Wavelength 

 L in feet 



366.0 



14.56 



Breakwater Width 

 I in feet 



63.0 



2.52 



Stone Diameter 



d= 1/2 (d + d . ) in feet 

 max ram-^ 



1.56 



0.0625 



Porosity 

 n 



0.435 



0.435 



L may be obtained from linear wave theory using h and T. 



2 ° 

 The porosity is assumed. Sensitivity of results to this assumption 



should be investigated. 



breakwater. The present numerical example together with the numerical 

 example presented in Section III therefore illustrate the detailed 

 calculations involved in the procedure for the prediction of reflection 

 and transmission coefficients of trapezoidal, multilayered breakwaters 

 which is developed in Section IV. The model breakwater characteristics 

 listed in Table 1 correspond to the characteristics of the crib-style 

 breakwater which is hydraulically equivalent to the breakwater config- 

 uration tested by Sollitt and Cross (1972). The determination of the 

 hydraulically equivalent breakwater is discussed in detail in Section 

 IV. 3. 



42 



