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distribution is in the range of -5 to -15 per foot (-16 to -50 per meter) 
for the experiments. For the limited data on other sizes, the slope of the 
concentration distribution becomes more negative as fall velocity increases. 
Turbuieut velucity fluctuations measured with a hot-film anemometer are 
normally distributed with mean zero for measurements at two elevations above 
the bed, well outside the viscous boundary layer. The root mean square of 
the velocity fluctuations decreases exponentially with distance above the 
bed, and at the bed, increases approximately linearly with increase in flume 
velocity. 
When extrapolated to typical field conditions seaward of the breaker, 
these experiments demonstrate the importance of fall velocity, maximum wave- 
induced bottom velocity, and turbulent velocity fluctuations in controlling 
Sediment suspension by shoaling waves. However, comparisons of data obtained 
with the lightweight sediment in these experiments and the probable motion of 
quartz sand in the field suggest that sediment suspensions caused by shoaling 
waves offshore of the breaker are likely to be limited. 
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