profile shape, it was thought that the profile would reach equilibrium 

 within a shorter period of time. 



The experiment covered in this study has been discussed in an earlier 

 report (Chesnutt, 1975) which analyzed the laboratory effects observed 

 in this experiment along with two other experiments with the same wave 

 steepness conducted in the 6-foot tank (see Vols. II and III). 



2. 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 re- 

 duction for all 10 experiments. The data collection and reduction pro- 

 cedures unique to the experiment in this study are documented in the 

 Appendix. 



The conditions of e:>cperiment 72D-06 (the subject of this study) and 

 experiment 71Y-06 (discussed in Vol. Ill, to be compared with experiment 

 720-06) are summarized in Table 1. The table shows that initial test 

 length, water depth, wave period, wave height, and sand size were the 

 same in both experiments . 



Table 1. Summary of experimental conditions. 



Experiment^ 



Initial test 



Initial 



Wave 



Generated 



Initial^ 





length 



slope 



period 



wave height 



median 

 grain size 





(ft) 





Cs) 



(ft) 



(mm) 



72D-06 



93 



0.05 



1.90 



0.36 



0.22 



71Y-06 



93 



0.10 



1.90 



0.36 



0.23 



^Refer to Volume I (Stafford and Chesnutt, 1977) for relation between 

 these experiments and the other eight LEBS experiments. 



^Initial dso determined by dry sieve method. 



NOTE. --Constants: water depth =2.33 feet; wave energy flux =5.8 

 foot-pounds per second-foot. 



The experimental facility used is shown in Volume I (Fig. 3) and in 

 the Appendix (Fig. A-1) . The facility consisted of two side-by-side 6- 

 foot-wide wave tanks, one with a 0.10 concrete slope 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 Sec- 

 tion IV and Appendix B of Volume I. The concrete slope provided a control 

 (a bench-mark value) for the varying reflection measured in the neighboring 

 tank with the movable bed. The initial test length was 7 feet greater on 

 the concrete side. 



The initial grading of the sand slope was on 25 September 1972. The 

 first run was on 3 October 1972, the last run was on 13 December 1972, 



10 



