Seiche | Wikipedia audio article

This is an audio version of the Wikipedia Article:


00:01:05 1 Causes and nature
00:03:14 2 Occurrence
00:03:44 2.1 Lake seiches
00:08:50 2.2 Sea and bay seiches
00:12:38 2.3 Underwater (internal) waves
00:14:47 3 Engineering for seiche protection
00:15:15 4 See also
00:15:42 5 Notes
00:15:51 6 Further reading
00:16:21 7 External links



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SUMMARY
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A seiche ( SAYSH) is a standing wave in an enclosed or partially enclosed body of water. Seiches and seiche-related phenomena have been observed on lakes, reservoirs, swimming pools, bays, harbours and seas. The key requirement for formation of a seiche is that the body of water be at least partially bounded, allowing the formation of the standing wave.
The term was promoted by the Swiss hydrologist François-Alphonse Forel in 1890, who was the first to make scientific observations of the effect in Lake Geneva, Switzerland. The word originates in a Swiss French dialect word that means "to sway back and forth", which had apparently long been used in the region to describe oscillations in alpine lakes.
Seiches in harbours can be caused by long period or infragravity waves, which are due to subharmonic nonlinear wave interaction with the wind waves, having periods longer than the accompanying wind-generated waves.