CHANNEL 

 SELECTION 

 CIRCUITRY 



MULTIPLEXER 



AND 



ANALOG TO 



DIGITAL 

 CONVERTER 



» STRIP CHART 



DIGITAL EQUIPMENT 



CENTRAL 

 PROCESSING ^ 

 UNIT 



DIGITAL 

 TO ANAUDG 

 CONVERTER 



LINES SELECTED 

 FOR DISPLAX AND 



RECORDING 



II"-- 



I I-- -I I 

 DIGITAL 

 OUTPUT 

 CONTROL 

 LINES 



CHANNEL 

 SELECTION 

 CIRCUITRY 



WAVE ROD AND 

 POTENTIOMETER 

 LINE PAIRS FOR 

 EACH WAVE STAND 



WAVE STAND 

 CALIBRAT10t< 

 STATUS LIGHTS 



PROGRAMS, 



TEST PARAMETERS, 



AND DATA 



WAVE STAND 



WAVE GENERATOR 



Figure 6. Automated Data Acquisition and Control System 



Design of Tracer Material 



As discussed previously, a fixed-bed model was constructed and a tracer 

 material designed and prepared to qualitatively determine movement and depo- 

 sition of sediment in the vicinity of Camp Ellis Beach. Tracer was chosen in 

 accordance with the scaling relations of Noda (1972), which indicate a relation 

 or model law among the four basic scale ratios, i.e., the horizontal scale X; the 

 vertical scale p; the sediment size ratio n^; and the relative specific weight 

 ratio ry These relations were determined experimentally using a wide range 

 of wave conditions and bottom materials and are valid mainly for the breaker 

 zone. 



Noda's scaling relations indicate that movable-bed models with scales in 

 the vicinity of 1:100 (model to prototype) should be distorted (i.e., they should 

 have different horizontal and vertical scales)., Since the fixed-bed model of 

 Camp Ellis Beach was undistorted to allow accurate reproduction of 



12 



Chapter 2 The Model 



