and type, allowing technicians to record lateral variations in breaker 

 position, and the positions of profile features, such as the shoreline 

 and the scarp on a plan view drawing of the wave tank. 



b. Special Data . Three 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 . All wave reflection data collected from 

 the movable-bed profiles in the two experiments were reduced by both the 

 manual and automated methods. Table A-2 presents the K/^ data determined 

 by the automated method. Plots of K/^ versus time (Figs. A-2 and A-3) 

 compare results from the two methods for experiments 71Y-06 and 71Y-10. 

 Figures A-4 and A-5 are plots of manual K;^ values versus automated K^ 

 values. These plots show that the automated method gave consistently 

 lower results and that the difference is not a function of the magnitude 

 of K/?. 



b. Sand-Size Distribution Data . All samples were analyzed in the 

 CERC Petrology Laboratory using the RSA. Approximately 5 percent of the 

 samples were analyzed by project personnel using the dry sieve method as 

 a quality control measure. 



c. Breaker Data . Breaker type was determined from slides and, after 

 84 hours in experiment 71Y-10 and 140 hours in experiment 71Y-06, from 

 the visual observation forms. Breaker position data were determined from 

 the logbooks and the visual observation forms. 



105 



