Skewness ( degrees ) 
Relative Frequency of Occurrence 
Microscopie Structures of Wind Waves 
oO 
On 
0 5 10 15 
Wind Velocity, US (m/sec ) 
FIGURE 10 - SKEWNESS OF WATER-SURFACE SLOPES AT VARIOUS WIND VELOCITIES 
(a) Skewness of Slope-distribution curves; 
(b ) Relative Frequency of Occurrence of Capillary Waves at 
Upwind (O) and Downwind (@) Faces of Gravity Waves 
1469 
