PART III: SUMMARY OF THE DATA 



26. This chapter contains a summary of the data on beach profile change 

 and wave conditions associated with the movable-bed model experiments per- 

 formed in the LWT during 1956-1957 and 1962. This chapter is intended to pro- 

 vide sufficient background information to allow analysis of the raw profile 

 data contained in Appendix C. 



Experiment Cases 



27. Profile survey data are available for nine major cases in the two 

 experiment series performed with 0.22- and 0.40-mm sand (Table 1). A "Case" 

 is defined as a collection of sequential profiles for a beach subjected to 

 incident waves of specified height and period. Wave properties pertain to the 

 horizontal section of the tank. Except for two cases (510 and 610), the 

 initial beach profile was an approximately 1 on 15 uniform slope. Table 1 

 gives the case numbers and elapsed times at which the profile was measured. 

 Total wave action typically ranged between 30 and 100 hr, and the times of the 

 surveys are given in decimal form. 



28. The numbering system for the cases is a modification of that estab- 

 lished by Birkemeier.^ Each case is identified by a three-digit number. The 

 first digit gives the ordinal number of the case and identifies the incident 

 wave conditions. Cases with the same first digit correspond to the same in- 

 cident wave conditions. The second digit, if different from zero, identifies 

 a variation performed in connection with the generic case with the same first 

 digit and zero as the second digit. The third digit identifies the grain size 

 used: corresponds to 0.22-mm sand, and 1 corresponds to 0.40-mm sand. 



Incident Wave Conditions and Water Levels 



29. Wave conditions and water levels are listed in Table 2. During 

 Case 700, the water level was decreased between profiles taken at elapsed 

 times of 5 hr and 10 hr, probably to eliminate water loss at the sides of the 

 tank. The water level was held at 3.81 m thereafter. Wave data appear in the 

 logbooks in connection with a small-scale model experiment to be associated 

 with Case 601. However, no record of Case 601 exists, and it is believed 



17 



