Profile Surveys 



15. Initial and final profiles of the reef were obtained by survey. 

 The survey rods had feet attached with ball-and-socket connectors. For the 

 small stone used for subsets 1 through 6, the foot of the survey rod had a 

 diameter of 2.54 cm; and for the somewhat larger stone used in subsets 7 

 through 10, the foot of the survey rod had a diameter of 3.81 cm. Three pro- 

 files were used to establish an average profile for the reef. One profile 

 line was exactly in the center of the wave channel, and the other two profile 

 lines were 15 cm on either side of center. The survey interval along the 

 channel was 3.05 cm. 



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