2 The Model 



Model Design 



Model experiments were conducted at a geometrically undistorted linear 

 scale of 1:48.4, model to prototype. Scale was based on the size availability of 

 model armor units and the capabilities of the available wave generator to 

 produce required wave heights at modeled water depths. Time relations were 

 scaled according to Froude Model Law (Stevens et al. 1942) and model-proto- 

 type relations were defined in terms of length / and time t shown in Table 1. 



Table 1 



Model-Prototype Scale Relations (1 :48.4 scale) 



Characteristic 



Dimension 



Scale Relations 

 ModehPrototype 



Length 



/ 



\,= 1:48.4 



Area 



I 2 



a r = 1:2342.6 



Volume 



/ 3 



v r = 1:113,380 



Time 



,w 



f,= 1:6.96 



The specific weights of water and construction materials differed between the 

 model and prototype; therefore, the transference equation of Hudson (1975) was 

 used to determine model material weights: 



(WX (U 



<*X 



z 



v'„ 



TO, 



where 



m = model quantities 

 p = prototype quantities 



(S± 



QX 



(i) 



Chapter 2 The Model 



