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3. Seiches
3.1 Description of the phenomenon
Lake Geneva boatmen used to refer to slow oscillations in lake level as "seiches". By analogy, this name has been applied to certain slow oscillations in sea level that occur in ports or bays.
Seiches are periodic oscillations, damped or sustained, in large bodies of water (roadsteads, harbor basins, canals, straits, lakes, etc.). They are gravity waves, with periods ranging from an order of magnitude minute to several hours. They manifest themselves mainly as horizontal oscillating movements, which are a nuisance for moored ships, and relatively slight vertical movements.
The curvature of these waves is therefore very small. As a result, they fall under the...
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