2 The Model 



Model Design 



The Nome Harbor model (Figure 4) was constructed to an undistorted linear 

 scale of 1 :90, model to prototype. Scale selection was based on the following 

 factors: 



a. Depth of water required in the model to prevent excessive bottom friction. 



b. .Absolute size of model waves. 



c. Available shelter dimensions and area required for model construction. 



d. Efficiency of model operation. 



e. Available wave-generating and wave-measuring equipment. 



/ Model construction costs. 



A geometrically undistorted model was necessary to ensure accurate reproduction of 

 wave and current patterns. Following selection of the linear scale, the model was 

 designed and operated in accordance with Froude's model law (Stevens et al. 1942). 

 The scale relations used for design and operation of the model were as follows: 



Characteristic 



Model-Prototype Dimension' 



Scale Relations 



Length 



L 



L, = 1:90 



Area 



L 2 



A, = L, 2 = 1:8,100 



Volume 



L 3 



V, = L, 3 = 1:729,000 



Time 



T 



T, = L," 2 = 1 :9.49 



Velocity 



L/T 



V, = L," 2 = 1:9.49 



Discharge 



L 3 fT 



Q, = L, 5/2 = 1:76,818 



'Dimensions are in terms of length (L) and time (T). 



Chapter 2 The Model 



