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proposed that the shorter the wavelength in a movable-bed experiment 
relative to a given tank width, the greater the likelihood of three- 
dimensional effects in profile development. 
The wave steepness was higher than the wave steepness in the comparable 
earlier experiments (0.039 versus 0.021 in Vols. II, III, and IV of the 
series), and the reflection coefficient was lower, as would be expected from 
increased breaker dissipation of steeper waves and for a shorter wave on the 
same slope. Variations in the reflection coefficient may have been caused by 
the change in phase difference between the waves reflected from the offshore 
slope and the foreshore slope as those two zones moved farther apart on the 
developing profile. 
The profile appeared to have almost attained an equilibrium shape after 
150 hours, in contrast to the comparable experiments with lower wave steep- 
ness, which were not approaching equilibrium after a much longer time in the 
same facility. 
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se tic eA CL ELDERS ANS Te SS 
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