FIG. 4 (color online). (a) Energy spectrum in the surface wave
driven turbulence at different frequencies (30, 45, and 60 Hz)
and at similar supercriticalities. Colored vertical bars show the
forcing ranges. (b) Third moment of the longitudinal velocity
increments measured at f0 ¼ 30 Hz at different supercriticalities
¼ 1ða ¼ 0:4 gÞ, and ¼ 2ða ¼ 0:6 gÞ.