Bottom waves

In surface waves or swell, water particles roll in a circular motion. Coming in toward the shore, this energy is squeezed by the reducing depth. Below the surface swell, at a depth half of the length of the swell, the circular rolling motion becomes more elliptical, and at the sea bottom the water particles rock back and forth up to the breaker line. This is the bottom wave phenomenon. It has been studied and concluded that surface waves and bottom waves are strongly correlated.

Bottom waves are by nature more continuous and predictable than wind. The reason is ocean swell which travels through ocean and hence can be forecasted days before it comes to shore. This gives excellent possibilities for predictable energy generation.