Table 3. Data collection schedule within runs for 
experiment 72C-10. 
Event Time within runs 
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 the 
morning and afternoon of each day of 
testing 
3. Scope. 
This report describes and analyzes the reduced data from LEBS experi- 
ment 72C-10. The original data are available in an unpublished laboratory 
memorandum (No. 4) filed in the CERC library (Leffler and Chesnutt, 1977). 
Wave reflection, profile surveys, sediment-size distribution, breaker 
characteristics, water temperature, and current observations are discussed 
in Section II. Section III discusses (a) profile development, which ex- 
amines the interrelation of changes in profile shape, sediment-size dis- 
tribution, breaker characteristics, water temperature, and currents; and 
(b) profile reflectivity, which examines the interrelation of changes in 
profile shape, breaker characteristics, currents, and wave reflection. 
Section IV summarizes the results on wave height variability, profile 
equilibrium, and other laboratory effects. 
The conclusions and recommendations (Sec. V) are aimed directly at 
the problems of the laboratory researcher or engineer in charge of a 
model study. Field engineers should be aware of these results when 
analyzing model studies for projects. 
The data in this study (particularly the profiles) may have other uses. 
The researcher can use these data, after consideration of the laboratory 
effects, to analyze short- and long-term changes in profile shape. The 
field engineer may use these data, after an .analysis of the laboratory and 
scale effects, to determine generalized shoreline recession rates for this 
very steep wave. 
le 
