In the course of the propagation of deep water waves to the shoal water zone, the distribution of the surface elevation and the wave spectrum will be changed due to shoaling effect.
深水海浪向近岸传播过程中，由于变浅作用，其波面高度分布，波谱都发生了变化。
Internal waves happen because the ocean is layered. Deep water is cold, dense, and salty, while shallower water is warmer, lighter, and fresher.
出现内波是因为海洋是分层的，深层水更凉，密度高而且含盐量高，浅层水更暖和，密度小而且更淡。
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.
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。
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