Breaking wave

In fluid dynamics and nautical terminology, a breaking wave or breaker is a wave that has enough energy to “break” at its peak. This happens when the wave reaches a critical level, and its energy changes from smooth, organized movement to turbulent, chaotic motion. At this point, simple models that describe how waves usually behave often stop working, especially those that assume the wave moves in a straightforward way.

The most common example of a breaking wave is when waves on the surface of the water crash onto a coastline. Wave breaking usually happens when the wave gets so big that the top part of it flips over. There are other situations in science where the term “breaking wave” is used in a similar way. For example, in meteorology, certain air waves are said to break when they create areas where the temperature gets colder with height, causing the energy to spread out in an unstable way. Breaking waves can also happen in plasmas, which are hot, charged gases, when particles move faster than the wave itself.

A reef or a shallow area of water, like a shoal, where waves often break, can also be called a breaker.

Types

Water waves can break in many places, not just near beaches, but they often break there because the water gets shallower. There are four main types of breaking waves: spilling, plunging, collapsing, and surging.

Spilling waves happen when the ocean floor slopes gently. The wave gets steeper until it becomes unstable, and foamy water spills down the front of the wave. This happens slowly as the wave moves toward the shore, making it a gentle wave.

Plunging waves occur when the ocean floor is steep or changes suddenly in depth. The wave gets very steep, then curls over and falls down, releasing a lot of energy at once. This creates the loud crashing sound you hear at the beach. Surfers love plunging waves because they can ride inside the curling part, called a "tube".