Dao Experimental Procedures. 
The experimental procedures used in the LEBS experiments are described 
in Volume I (Stafford and Chesnutt, 1977) which provides the necessary 
details on the equipment, quality control, data collection, and data 
reduction for all 10 experiments. Data collection and reduction pro- 
cedures unique to the experiment in this study are documented in the 
Appendix. 
The conditions of experiment 72C-10 (the subject of this report) and 
experiment 71Y-10 (discussed in Vol. III and compared with experiment 
72C-10 in this volume) are summarized in Table 1. The table shows that 
initial test length, initial slope, water depth, and sand size were the 
same in both experiments. Although the wave period, height, steepness, 
and energy density differed, the wave energy flux was the same. The 
wavelength was 10.26 feet (3.13 meters). 
Table 1. Summary of experimental conditions. 
Initial? 
median 
Generated? 
wave height 
Experiment! Initial test Initial 
length slope 
grain size 
(ft) (ft) (mm) 
0.41 0.21 
71Y-10 0.36 0528 
lRefer to Volume I (Stafford and Chesnutt, 1977) for relation between 
these experiments and the other eight LEBS experiments. 
*Determined for the given wave period and constant water depth of 2.33 
feet (0.7 meter) so that the generated wave energy flux, computed from 
linear theory, had a constant value of 5.8 foot-pounds per foot-second. 
3Initial dsq by dry sieve analysis. 
NOTE.--Constants: water depth = 2.33 feet, wave energy flux = 5.8 foot- 
pounds per foot-second. 
The experimental facility used is shown in Volume I (Fig. 4) and in 
the Appendix (Fig. A-1). The facility consisted of two side-by-side 
10-foot-wide (3 meters) wave tanks, one with a 0.10 concrete siope and 
the other a sand slope. A generator was common to both tanks so that 
each had identical wave energy input. The operation of the generators is 
described in Section IV and Appendix B of Volume I. The concrete slope 
provided a control (a bench-mark value) for the varying reflection meas- 
ured in the neighboring tank with the movable bed. The initial test 
length was 7 feet (2.1 meters) greater on the concrete side. 
The initial grading of the sand slope was 27 September 1972. The 
first run was on 3 October 1972, the last run was on 7 December 1972 after 
140 hours, and the data collection was completed 14 December 1972. The 
dates are important because the experiments were run in outdoor facilities 
10 
