wave

Undulation caused by the wind on the surface of a sea or lake.

wave base

Maximum depth beneath which wave action is no longer perceptible.

still water level

Level of the water surface in the absence of waves.

trough

Lowest point of the wave.

sand bar

Accumulation of sediment at the bottom of the sea, close to the shoreline; it is sometimes exposed at low tide.

foam

Whitish froth that forms on the water surface when a wave breaks.

shore

Strip of land where the sea meets the land.

breaker

High wave that breaks on the coast.

wave length

Horizontal distance between two successive crests or troughs.

crest

The highest point of a wave.

wave height

Vertical distance between the crest and the trough.