2 The Model 



Design of Model 



The Camp Ellis Beach model (Figure 4) was constructed to an undistorted 

 linear scale of 1:100, 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 reproduc- 

 tion 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). Scale relations used for design and operation of the 

 model were as follows: 



Characteristic 



Model-Prototype Dimension^ 



Scale Relations 



Length 



L 



L^ = 1:100 



Area 



L2 



A, = L,^= 1:10,000 



Volume 



L3 



V^ = L^^= 1:1,000,000 



Time 



T 



1, =L/' =1:10 



Velocity 



UT 



V, = L/2 = 1:10 



Discharge 



L^/T 



Q^ = L,^'^ = 1:100,000 



Dimensions are in terms of length (L) and time (T). 



Chapter 2 The Model 



