(d) Differences in the shape of the offshore zone between the two 
tanks were apparently the result of re-reflection and secondary wave 
effects caused by the difference in initial test length (Fig. 12). 
(e) The gap at the end of the generator blade in experiment 72B-10 
and the critical combination of wavelength and tank width caused a trans- 
verse wave. This accounted for a 0.16-foot lateral variation in wave 
height (Figs. 6, 7, and 8 and Table 7). 
(f) The transverse wave affected the shape of the profile: the shore- 
line became skewed, the depth of the shelf in the offshore zone increased 
laterally, and changes in the inshore zone progressed from one side of 
the tank to the other during the experiment (Fig. 44). 
2. Recommendations. 
(a) The final profile shape in experiment 72B-06 could be used as an 
approximation to an equilibrium profile for these wave, sediment, and 
initial slope conditions (Fig. 12). 
(b) Researchers and modelers using wave generators with gaps at the 
end of the blade should consult Madsen (1974) to determine critical wave 
periods for each water depth used in testing. 
82 
