MODEL LIMITS 



Figure 4. Model layout 



The existing causeway and revetment adjacent to Nome Harbor, as well as the 

 proposed jetties and breakwaters, are rubble-mound structures. Experience and 

 experimental research have shown that considerable wave energy passes through the 

 interstices of this type structure; thus, the transmission, reflection, and absorption of 

 wave energy became a matter of concern in the design of a 1 :90-scale model. In 

 small-scale hydraulic models, rubble-mound structures reflect relatively more and 

 absorb or dissipate relatively less wave energy than geometrically similar prototype 

 structures (LeMehaute 1965). Also, the transmission of wave energy through a 

 rubble-mound structure is relatively less for the small-scale model than for the 

 prototype. Consequently, small-scale model rubble-mound structures must be 

 adusted somewhat to ensure satisfactory reproduction of wave-reflection and wave- 

 transmission characteristics. In past investigations (Dai and Jackson 1966, 

 Brasfeild and Ball 1967) at WES, this adjustment was made by determining wave- 



Chapter 2 The Model 



