APPENDIX 



EXPERIMENTAL PROCEDURES FOR 72D-06 



This appendix documents those aspects of the experimental procedures 

 unique to experiment 72D-06. The procedures common to all experiments 

 are documented in Volume I (Stafford and Chesnutt, 1977) . 



1. Experimental Layout . 



At the beginning of experiment 72D-06, the movable-bed profile was 

 constructed with sufficient sand to form a 0.05 initial slope, with the 

 initial SWL intercept the same distance from the generator as in experi- 

 ment 71Y-06. The SWL intercept on the fixed-bed slope was 7 feet far- 

 ther from the generator as in experiment 71Y-06. Figure A-1 shows the 

 position of the initial profiles with respect to the coordinate system. 



In the process of moving the needed sediment from the stockpile to 

 the experimental facility, the sediment was screened through 0.5-inch 

 wire mesh to remove any large material. No attempt was made to remove 

 the fine material which had contaminated the stockpile and significantly 

 increased the turbidity of the water. 



2 . Data Collection . 



a. Regular Data . 



(1) Wave Height Variability . During the first run (to 0:10), a 

 continuous water surface elevation recording was made at station 48 near 

 the toe of the movable-bed profile and 25 feet (7.6 centimeters) from 



the toe of the fixed-bed slope. During all subsequent runs, wave envelopes 

 were recorded with wave gages moving along the center of each tank from 

 station +15 to +85 and return up to 10 hours and from station +20 to +85 

 and return after 10 hours, with the instrument carriage moving at a near- 

 constant speed of 10 feet per minute. From 100 to 180 hours, envelopes 

 were also recorded from station +20 to +5 and return. 



(2) Wave-Generated Current Data . Observations of wave-generated 

 surface currents were limited to the first 50 hours of the experiment. 

 Attempts to observe bottom currents were hampered by the turbidity problem. 



b. Special Data . Four types of special data were collected at less 

 frequent intervals, and Table A-1 indicates the times 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 Kn was used with the grade I data, which had no data 



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