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What happens to the water depth as the Tsunami waves approach the coas

June 1, 2025 by rawan239

What happens to the water depth as the Tsunami waves approach the coast ?

Decreases

Increases

Increases and decreases alternatively

Neither increases nor decreases

This question was previously asked in

UPSC CAPF – 2009

Download PDF Attempt Online

As Tsunami waves approach the coast, the water depth decreases.

Tsunami waves are long-period waves. As they move from the deep ocean into shallower coastal waters, their speed decreases due to friction with the seabed, but their height increases significantly due to the conservation of energy. This phenomenon is known as shoaling.

In the deep ocean, tsunamis have a long wavelength and small amplitude (height), making them often unnoticed by ships. As they enter shallow water, the wavelength shortens, the speed slows dramatically, and the wave height can build up to several meters or even tens of meters upon reaching the coast.

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