DIGITAL EQUIPMENT 



CHANNEL 

 SELECTION 

 CIRCUITRY 



Mi "1PLEXER 



iND 



f .OG TO 



MTAL 

 C /ERTER 



-» STRIP CHART 



PACKS 



II— -III 

 DIGITAL 

 OUTPUT 

 CONTROL 

 LINES 



CENTRAL 



PROCESSING 



UNIT 



DIGITAL 

 TO ANALOG 

 CONVERTER 



LINES SELECTED 



FOR DISPLA\ AND 



RECORDING 



CHANNEL 

 SELECTION 

 CIRCUITRY 



WAVE ROD AND 

 POTENTIOMETER 

 LINE PAIRS FOR 

 EACH WAVE STAND 



WAVE STAND 

 CALIBRATION 

 STATUS LIGHTS 



PROGRAMS, 



TEST PARAMETERS, 



AND DATA 



WAVE GENERATOR 



Figure 6. Automated Data Acquisition and Control System 



the change in water-surface elevation with respect to time, were recorded on 

 magnetic disks. These data then were analyzed to obtain the parametric wave data. 



A water circulation system (Figure 4), consisting of a 15.2-cm (6-in.), 

 perforated-pipe water-intake manifold, a 0.03-cms (1-cfs) pump, and sonic flow 

 transducers with a multiprocessor transmitter, was used in the model to reproduce 

 steady-state flows through the Snake River that corresponded to selected prototype 

 river flows. The magnitudes of river currents were measured by timing the progress 

 of weighted floats over known distances. 



A 0.6-m (2-ft) (horizontal) solid layer of fiber wave absorber was placed along 

 the inside perimeter of the model to dampen wave energy that might otherwise be 

 reflected from the model walls. In addition, guide vanes were placed along the wave 

 generator sides in the flat pit area to ensure proper formation of the wave train 

 incident to the model contours. 



10 



Chapter 2 The Model 



