the measurements had no error and that 97 percent o£ the measurements were 

 within 0.02 foot of the actual elevations. 



The position of the gages at the specified ranges was within ±0.02 foot, 

 the maximum lateral movement of the carriage. The position of the carriage 

 at the specified stations was never off more than 0.05 foot, the finest 

 division on the tape. 



In summary, the accuracy of the survey measurements was ±0.05 foot in 

 the x-direction, ±0.02 foot in the y-direction, and ±0.02 foot in the 

 z-direction (Fig. 5). 



2. Data Reduction . 



a. Quality Control . After initial quality control checks, the scan- 

 ning sheets were interpreted using the IBM Optical Mark Page Reader, pro- 

 ducing a card deck. The data cards were edited for scanning machine errors, 

 missing or incorrect heading information, and bad data. The elevations 

 were corrected for carriage elevation variations, as measured in that test 

 year. Specific data on carriage elevation surveys and the resulting cor- 

 rections used in data reduction are in subsequent reports dealing with 

 individual experiments. 



b. Data Reduction Programs . Each deck of data cards was run through 

 the BEPROF package of programs. The BEPROF programs were developed for 

 the CERC Beach Evaluation Program (BEP) to manipulate field survey data 

 and were modified for use with laboratory data. The program BEPROF uses 

 the edited and corrected deck of cards to generate a magnetic tape for use 

 with several programs to manipulate the data. The PRFL2C program was used 

 to display the reduced data by: (a) Plots of profiles, all surveys per 

 range; (b) plots of profiles, all ranges per survey; (c) tables of distance 

 to contour intercepts; and (d) punchcards with distance to contour inter- 

 cepts (at depth increments of 0.1 foot for all surveys and ranges) to be 

 used in the CONPLT program. The CONPLT program plots the x-direction 

 movement of selected contour intercepts with time. These plots show pro- 

 file changes throughout one experiment for each profile. CONPLT plots are 

 the major means of presenting profile results in the series of LEBS data 

 reports. 



VII. BREAKER AND RUNUP DATA 



1. Data Collection. 



Wave breaking and runup data were collected by three methods during 

 the 3-year experimental program: photography in 1970; photography and 

 visual observations in 1971; and photography, visual observations, and 

 wave gages in 1972. 



a. Photography . At specified times during each run, 55-millimeter 

 slides were taken of the wave breaking and runup. Technicians were able, 

 with some experience, to photograph the breaking wave just as it began to 

 spill for the spilling breaker and at the point when the face of the wave 



41 



