JoU 



1 i 



1 1 1 1 1 1 1 1 1 





^- "\ 



^x^^ 



\^^ PROTOTVPE SCALE 



- 



^ 



\ \ 



- 









1 1 



1 1 i\ 1 i\ 1 1 1 1 



— 



10 20 30 



RANGE - (m) 



Figure 6. Regular wave initial condition 



Model Scale Selection 



40 



50 



80. The fail speed scaling relations previously discussed and summarized by Equation 6 were used to 

 design the movable-bed model parameters. Fine quartz sand obtained from the Ottawa Sand Company in 

 Ottawa, Illinois, having a median diameter of 0.13 mm and specific gravity of 2.65 was used to simulate the 

 0.33-mm median-diameter prototype sand. The Froude scaling criterion was used to determine model wave 

 period and the time scale for morphological development. 



81. An undistorted length scale ratio of 7.5 (prototype) to 1 (model) was determined using Equation 6 

 and the information given in Table 1. 



Table 1. Prototype and Model Sediment Parameters 



Parameter 



Prototype 



Model 



Sediment Median Diameter 

 Mean Sediment Fall Speed 



0.33 mm 

 4.47 cm/sec 



0.13 mm 

 1.64 cm/sec 



31 



