the model ocean connected through a pump (Fig. 3-20). By controlling the 

 water direction and flow rate, a littoral current in either direction and 

 of any desired strength can be induced in the model ocean. Flow direc- 

 tion can be controlled either by a bypass line equipped with appropriate 

 valves around the pump or by a reversible pump. 



P^C/F/c ocEA 



N 



~rr 



.^ ^^_^y-^ ____,, k iMyfs ^^ ^^_. ^ 



/ 



Jj 



w 

 \\ 



I I 



I! '' 



Figure 3-2Q. Typical littoral current generator. 



(9) Powerplant Simulators . During heat-dispersion tests the 

 powerplant cooling water is withdrawn from the appropriate location in 

 the model and at the proper flow rate, heated to reproduce the desired 

 temperature differential, and then discharged at the appropriate location 

 in the model. The inflow rate is measured by a rotameter, the inflow 

 temperature is monitored, and the heaters are set to produce the desired 

 temperature differential. 



(10) Shoaling Injection Apparatus . In fixed-bed shoaling studies 

 a simulated sediment is introduced into the model in a manner determined 

 by trial and error. Two basic types of model sediments are used: (a) 

 granulated plastic or nylon, and (b) finely ground gilsonite. The plastic 



90 



