7 July 1972 after 135 hours, and the data collection was completed 
11 July 1972. Experiment 72A-10 was begun 17 May 1972, was stopped on 
7 July 1972 after 80 hours, and the data collection was completed 12 
July 1972. The dates are important because the experiments were run in 
outdoor facilities with water temperature varying with ambient air 
temperature. The major events of each experiment and the cumulative 
- time at the end of each run are summarized in Table 2. 
Table 3 gives the data collection schedule within each 5-hour run. 
During the first 5 hours when the runs varied in length, the same data 
were collected, with the schedule depending on the length of the run. 
Table 3. Data collection schedule within runs 
for experiments 72A-06 and 72A-10. 
Event Time within runs 
(hr:min) 
Photo of SWL intercept and upper slope, Before start 
if damaged since last run 
Current data Throughout run 
Recording of wave envelope 4:40 
Preparation of visual observation form 4:55 
Photos of runup and breaker 4:59 
Photo of SWL intercept and upper slope, 5:00 
after water had calmed 
Profile survey 5:00 
Water temperature data collected in 
morning and afternoon of each day of 
testing 
Si Scope. 
This report describes and analyzes the reduced data from LEBS 
experiments 72A-06 and 72A-10. The original data are available in 
an unpublished laboratory memorahdum (No. 5) (Leffler and Chesnutt, 
1978) filed in the CERC library. 
Wave height variability, profile surveys, sediment-size distribution, 
breaker characteristics, water temperature, and current observations are 
discussed in the following section. Section III discusses the inter- 
relation of changes in wave reflection, profile shape, sediment-size 
distribution, breaker characteristics, water temperature, and currents. 
Section IV discusses the results of wave height variability, profile 
equilibrium, and other laboratory effects. 
