oscillation ripple (wave ripple mark) Small ridge of sand formed by wave action on the floor of a sea or lake. Such ripples, which are usually less than 10 cm in height, commonly display rounded symmetrical troughs and rounded, or sometimes sharp, symmetrical peaks, although many wavegenerated ripples are not symmetrical owing to an inequality in forward and backward motion associated with the wave action. The ripple index of oscillation ripples is usually between 6 and 10.

oscillation ripple(wave ripple mark) A small ridge of sand formed by wave action on the floor of a sea or lake. Such ripples, which are usually less than 10 cm in height, commonly display rounded symmetrical troughs and rounded, or sometimes sharp, symmetrical peaks, although many wave-generated ripples are not symmetrical owing to an inequality in forward and backward motion associated with the wave action. The ripple index of oscillation ripples is usually between 6 and 10.