fixed-bed tank the average incident wave height was 0.44 foot (13.4 

 centimeters), 0.03 foot (0.9 centimeter) above the nominal (generated) 

 height, and the range of heights was only 0.03 foot. 



In the movable-bed tank the range of values was 0.09 foot (2.7 centi- 

 meters), so that 0.06 foot (1.8 centimeters) is assumed due to varying 

 profile reflectivity. The average incident wave height was 0.43 foot 

 (13.1 centimeters), just over the nominal (generated) height by 0.02 

 foot (0.6 centimeter). 



b. 1.90-Second Wave . The nominal (generated) wave height for the 

 1.90-second wave period was 0.36 foot (11.0 centimeters). In the fixed- 

 bed tanks the average incident wave heights for the five 1.90-second tests 

 were all within 0.02 foot of the nominal (generated) height. In the 10- 

 foot tank, initial test length of 61.7 feet (18.8 meters), the average was 

 0.36 foot, the same as the nominal (generated) height; in the 6-foot tank, 

 initial test length of 100 feet (30.5 meters), the average was 0.37 or 

 0.38 foot (11.3 or 11.6 centimeters). In four of the five experiments 

 the range of variation in incident wave height was 0.03 foot and in 

 experiment 71Y-06 the range was 0.04 foot (1.2 centimeters). 



In the movable-bed tank in experiment 70X-06 the range of values was 

 0.06 foot, 0.03 foot due to varying reflectivity; in experiment 70X-10 

 the range was 0.05 foot (1.5 centimeters), 0.02 foot due to varying 

 reflectivity; in experiment 71Y-06 the range was 0.07 foot (2.1 centi- 

 meters), 0.03 foot due to varying reflectivity, and in experiment 72D-06 

 the range was 0.06 foot, 0.03 foot due to varying reflectivity. 



The average incident wave height in the movable-bed tanks was less 

 than the nominal (generated) height in experiment 70X-06, equal to the 

 nominal (generated) height in experiment 71Y-10, and greater than the 

 nominal (generated) height in experiments 70X-10, 71Y-06, and 72D-06. 



c. 2.35-Second Wave . The nominal (generated) wave height for the 

 2.35-second wave period was 0.34 foot (10.4 centimeters). In the fixed- 

 bed tanks the average incident wave height was 0.02 foot above the nominal 

 (generated) height in experiment 72B-06 and equal to the nominal (generated) 

 wave height in experiment 72B-10. The difference was likely due to the 

 difference in initial test length. The range of incident heights was 0.05 

 foot in experiment 72B-06 and 0.04 foot in experiment 72B-10. 



In the movable-bed tank in experiment 72B-06 the range of heights 

 was 0.06 foot, only 0.01 foot (0.3 centimeter) due to varying reflec- 

 tivity, and in experiment 72B-10 the range was 0.03 foot, which was , 

 within the accuracy of the wave height measurement; thus, the effect 

 of re-reflection in each experiment was not measurable. 



d. 3.75-Second Wave . The nominal (generated) wave height for the 

 3.75-second wave period was 0.31 foot (9.4 centimeters). In the fixed- 

 bed tanks the average incident wave heights were within 0.01 foot of one 

 another and both were greater than the nominal (generated) height. The 

 range of incident height variation was 0.07 foot in experiment 72A-06 

 and 0.04 foot in experiment 72A-10. 



49 



