Sketch of seiches of different order, showing the position of the sea surface at the two opposite phases of the wave (1/2 period apart).

The first diagram shows a first order seiche; it is identical to the seiche shown in Figure 10.2. The second diagram shows a second order seiche. This figure can also be seen as an animation.

The third diagram shows a first order seiche in a bay which is open to the sea; here, the node is at the mouth of the bay and the wavelength is twice the wavelength observed in a closed basin. This figure can also be seen as an animation.

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