Difference between revisions of "Seiche"
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{{Definition|title=Seiche | {{Definition|title=Seiche | ||
| − | |definition= | + | |definition= Harbour seiches are resonant (or near-resonant) standing oscillations in a semi-enclosed water body caused by incoming long-period waves (periods typically in the range 200-2000 s). }} |
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| + | ==Notes== | ||
| + | *Incoming waves can be strongly amplified if the period is close to the harbour resonance period, causing damage to ships and moorings. | ||
| + | *Long-period waves can be generated by nonlinear interaction of random short waves with a peaked frequency distribution (see [[Infragravity waves]]), generated mainly in shallow water and reflected from adjacent coasts. | ||
| + | *Long-period waves can also be generated by meteorological effects, in particular strong wind speed fluctuations during storms, related to the passage of a cold front<ref>De Jong, M.P.C. and Battjes, J.A. 2004. Low-frequency seawaves generated by atmospheric convection cells. J. Geophys. Res. 109(C1), C01011</ref>. | ||
| + | * Other generation mechanisms include deep-sea internal waves, seismic activity, or tsunamis<ref>Giese, G.S. and Chapman, D.C. 1993. Coastal seiches. Oceanus 36: 38-46</ref>. | ||
| + | *Seiches occur also in closed basins, such as lakes, often induced by strong fluctuations in the wind field. | ||
==References== | ==References== | ||
<references/> | <references/> | ||
Revision as of 16:02, 30 March 2021
Definition of Seiche:
Harbour seiches are resonant (or near-resonant) standing oscillations in a semi-enclosed water body caused by incoming long-period waves (periods typically in the range 200-2000 s).
This is the common definition for Seiche, other definitions can be discussed in the article
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Notes
- Incoming waves can be strongly amplified if the period is close to the harbour resonance period, causing damage to ships and moorings.
- Long-period waves can be generated by nonlinear interaction of random short waves with a peaked frequency distribution (see Infragravity waves), generated mainly in shallow water and reflected from adjacent coasts.
- Long-period waves can also be generated by meteorological effects, in particular strong wind speed fluctuations during storms, related to the passage of a cold front[1].
- Other generation mechanisms include deep-sea internal waves, seismic activity, or tsunamis[2].
- Seiches occur also in closed basins, such as lakes, often induced by strong fluctuations in the wind field.
