These are infragravity waves, so called because they are sub-harmonics of the original gravity waves.
这就是亚重力波，之所以这样命名是因为它们是原始重力波的分谐波。
Bound infragravity waves are forced by wave-wave nonlinear interaction of two wind waves, depended only on the swell energy and water depth.
强迫次重力波的形成机制为海浪的波-波非线性相互作用，它仅依赖于海浪和水深的大小。
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