Which breaking wave topples forward and forms an air-filled tube?

Which breaking wave topples forward and forms an air-filled tube?

• A. Rogue Wave
• B. Seiche
• C. Progressive Wave
• D. Plunging Wave

Answer: (D)

When a wave moves from deep water toward shore, it slows and grows taller as depth decreases, a process called shoaling. Depending on how steep the wave becomes and the bottom slope, it can break in different styles. The one that topples forward as the crest curls over and traps air to create a hollow, air-filled tube is the plunging breaker. This happens when the crest becomes so steep that it curls forward, forming a barrel with an air chamber inside—a defining feature of plunging waves. The other options don’t describe this curling, tube-forming behavior: a rogue wave is an unusually large isolated surge, a seiche is a standing wave in a basin, and a progressive wave is simply a traveling wave before it breaks.

When a wave moves from deep water toward shore, it slows and grows taller as depth decreases, a process called shoaling. Depending on how steep the wave becomes and the bottom slope, it can break in different styles. The one that topples forward as the crest curls over and traps air to create a hollow, air-filled tube is the plunging breaker. This happens when the crest becomes so steep that it curls forward, forming a barrel with an air chamber inside—a defining feature of plunging waves. The other options don’t describe this curling, tube-forming behavior: a rogue wave is an unusually large isolated surge, a seiche is a standing wave in a basin, and a progressive wave is simply a traveling wave before it breaks.