<p><strong>Fig. 4.18.</strong> (<strong>A</strong>) If a small buoy (black circle) was on the surface of the water, it would move in a circular motion, returning to its original location due to the orbital motion of waves in deep water. (<strong>B</strong>) As deep-water waves approach shore and become shallow-water waves, circular motion is distorted as interaction with the bottom occurs.</p>

Fig. 4.18. (A) If a small buoy (black circle) was on the surface of the water, it would move in a circular motion, returning to its original location due to the orbital motion of waves in deep water. (B) As deep-water waves approach shore and become shallow-water waves, circular motion is distorted as interaction with the bottom occurs.

Image by Byron Inouye