Here's a breakdown:
* Circular motion: In deep water, the particles move in a circular path. The diameter of the circle decreases as you go deeper into the water.
* Elliptical motion: In shallower water, the circular motion becomes more elliptical. This is because the bottom of the wave is restricted by the seabed.
Key points:
* Energy transfer, not particle transport: While the particles move in a circular/elliptical path, they don't travel long distances horizontally. The wave energy is transferred forward, but the individual particles themselves stay relatively close to their original position.
* Wave crest vs. trough: The particles at the wave crest move upwards and forwards, while those at the trough move downwards and backwards.
* Wavelength and amplitude: The diameter of the circular or elliptical path of the particle is related to the amplitude of the wave.
So, think of a surface wave like a ripple in a pond: the water molecules move in a circular path, but the ripple itself moves across the surface of the pond.
