随着海啸靠近海岸，波浪的速度会减至每小时约20英里到30英里。
As it approaches the coast, the wave slows down to about 20 to 30 miles an hour.
在深海水域，海啸的传播速度像喷气式飞机一样快，但在海面看到的波浪不大。
Tsunamis travel as fast as jet aircraft in deep water, where they are spread over a far deeper water column and make for smaller and very gradual waves at the surface.
不规则波浪作用下沿岸流的速度分布相对平缓。
The cross-shore profile of current velocity induced by irregular wave is smoother than the current induced by regular wave.
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