APPENDIX 
EXPERIMENTAL PROCEDURES FOR 72A-06 AND 72A-10 
This appendix documents those aspects of the experimental procedures 
unique to experiments 72A-06 and 72A-10. The procedures common to all 
experiments are documented in Volume I (Stafford and Chesnutt, 1977). 
1. Experimental Layout. 
The experimental layout was the same as that used for experiments 
71Y-06 and 71Y-10 (Vol. III). Figure A-1 shows the position of the 
initial profiles with respect to the coordinate system. 
2. Data Collection. 
a. Regular Data. 
(1) Wave Height Variability. During the first run in each 
experiment, a wave gage recorded the water surface elevation at station 
+25 near the toe of the movable-bed profiles and 7 feet farther from 
the toe of the fixed-bed slopes. During all subsequent runs, wave 
envelopes were recorded with wave gages moving along the center of the 
two tanks in experiment 72A-06 from station +15 to +85 and return, and 
along the center of the fixed-bed tank and ranges 1, 5, and 9 in the 
movable-bed tank of experiment 72A-10 from station +15 to +50 and return. 
(2) Wave-Generated Current Data. Observations of wave-generated 
surface currents were made during the, first 85 hours and from 125 to 135 
hours in experiment 72A-06. Also, observations of bottom currents using 
bobs and fluorescein dye were made intermittently during the first 75 
hours in experiment 72A-06. Several observations were made during the 
first 30 hours of experiment 72A-10. 
b. Special Data. Four types of special data were collected at less 
frequent intervals, and Table A-1 indicates the time when each type of 
data was collected. 
3. Data Reduction. 
a. Wave Height Variability. The wave reflection envelope recordings 
were divided into two grades for data reduction. The automated method 
for determining Kp was used with the grade I data, which had no quality 
control problems. The manual method for determining Kp was used with 
the grade II data, which had problems of (a) pen skips, (b) highly vari- 
able instrument carriage speed, or (c) off-scale values. Twenty percent 
of the grade I envelopes were also reduced manually to provide a compari- 
son of the two methods. 
b. Sand-Size Distribution. All samples were analyzed using the VA 
tube method by the U.S. Army Engineer Division, Missouri River, laboratory. 
83 
