/saysh/, n.
an occasional and sudden oscillation of the water of a lake, bay, estuary, etc., producing fluctuations in the water level and caused by wind, earthquakes, changes in barometric pressure, etc.
[1830-40; < Franco-Provençal]

* * *

      rhythmic oscillation of water in a lake or a partially enclosed coastal inlet, such as a bay, gulf, or harbour. A seiche may last from a few minutes to several hours or for as long as two days. The phenomenon was first observed and studied in Lake Geneva (Lac Léman), Switzerland, in the 18th century.

      Seiches may be induced by local changes in atmospheric pressure. They also may be initiated by the motions of earthquakes and by tsunamis, in the case of coastal inlets. Seismic surface waves from the Alaska earthquake of 1964, for example, triggered seiche surges in Texas in the southwestern United States when they passed through the area. Studies of seiche behaviour have shown that once the surface of the water is disturbed, gravity seeks to restore the horizontal surface, and simple vertical harmonic motion ensues. The impulse travels the length of the basin at a velocity dependent on the water depth and is reflected back from the basin's end, generating interference. Repeated reflections generate standing waves with one or more nodes, or points, that experience no vertical motion. The length of the lake is an exact multiple of the distance between nodes.

      Seiches may disturb shipping by generating strong reversible currents at the entrances to harbours or by causing moored vessels to oscillate against their mooring cables and break free. Seiches also may drown unwarned persons on piers and shores.

* * *

Universalium. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • Seiche — is also a French term for a type of cuttlefish (Sepiida).A seiche (pronounced IPA|/seɪʃ/, or approximately saysh ) is a standing wave in an enclosed or partially enclosed body of water. Seiches and seiche related phenomena have been observed on… …   Wikipedia

  • Seiche — Seiche, 1) so v.w. Urin; 2) im Bergbau ein rinnendes Wasser …   Pierer's Universal-Lexikon

  • Seiche — Seiche,die:⇨Urin(1) …   Das Wörterbuch der Synonyme

  • seiche — Seiche, ou boufron, une sorte de poisson ainsi appelé, Sepia …   Thresor de la langue françoyse

  • seiche — [sāsh] n. [< Swiss Fr] a natural, standing wave in the water of a lake, bay, etc., caused by changes in atmospheric pressure, seismic disturbances, winds, waves, tides, etc.: it continues after the generating force stops …   English World dictionary

  • seiche — 1. seiche [ sɛʃ ] n. f. • 1270; sècheXIIe; lat. sepia, gr. sêpia ♦ Mollusque céphalopode à coquille interne en forme de bouclier (os de seiche), pourvu d une poche à encre sécrétant un liquide brun foncé qu il peut projeter pour s abriter en cas… …   Encyclopédie Universelle

  • Seiche — Un seiche (pronúnciese ˈseɪʃ : seish ) es una onda estacionaria en un cuerpo de agua encerrado o parcialmente encerrado. Los seiches y los fenómenos relacionados a seiche se han observado en lagos, embalses, piletas, bahías, mares. La clave… …   Wikipedia Español

  • Seiche — Als Seiche (frz. /sɛʃ/) bezeichnet man stehende Wellen des Wassers in Seen, Buchten oder Hafenbecken. Eine stehende Welle (rot) als Darstellung der Summe zweier sich verstärkender Wellen, die in entgegengesetzte Richtungen laufen (grün und blau) …   Deutsch Wikipedia

  • Seiche — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Sur les autres projets Wikimedia : « Seiche », sur le Wiktionnaire (dictionnaire universel) En biologie, les seiches sont des mollusques… …   Wikipédia en Français

  • seiche — (sè ch ) s. f. Voy. sèche. SUPPLÉMENT AU DICTIONNAIRE 2. SEICHE (sè ch ), s. f. Nom donné aux variations rapides de niveau dans les lacs de la Suisse, Acad. des sc. Comptes rend. t. LXXIX, p. 10. •   Les riverains du lac Léman appellent seiche un …   Dictionnaire de la Langue Française d'Émile Littré

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”