seiche

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seiche:

see wavewave,
in oceanography, an oscillating movement up and down, of a body of water caused by the frictional drag of the wind, or on a larger scale, by submarine earthquakes, volcanoes, and landslides.
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, in oceanography.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Seiche

 

a standing wave of long period (from several minutes to tens of hours) that arises in large or small enclosed basins of water, such as seas, lakes, and bays. Seiches result from the interference of waves created by external forces, for example, sharp changes in atmospheric pressure, wind, or seismic phenomena, with waves reflected from the end of the basin. Seiches involve oscillation of the entire mass of water, so that there always exist one or more lines (points a and a’ in Figure 1, a and b), called nodes or nodal lines, along which the level does not change.

Figure 1

Seiches may be mononodal (Figure l, a), binodal (Figure l, b), and so forth, with amplitudes from a few millimeters to several meters. For example, seiches in Lake Geneva have attained an amplitude of 2 m with a period of more than I hr. In the Bay of Algiers seiches have attained amplitudes as high as 1 m and periods somewhat longer than 1 min, and in the Sea of Azov seiches with periods up to 23 hr and amplitudes of 10–25 cm have been reported.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

seiche

[sāsh]
(fluid mechanics)
An oscillation of a fluid body in response to the disturbing force having the same frequency as the natural frequency of the fluid system.
(oceanography)
A standing-wave oscillation of an enclosed or semienclosed water body, continuing pendulum-fashion after cessation of the originating force, which is usually considered to be strong winds or barometric pressure changes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
His paper will reportedly detail the theory that that least two huge seiches 20 minutes apart ravaged the land, leaving the deposits covering the fossils the scientists have spent the last six years uncovereing.
They told the news site that the shaking would have created a seiche - a standing wave- inland.
While the drama at Ottawa Beach was unfolding, the seiche had already taken the lives of three others a little farther north.
Coast Guard, state park authorities, Ottawa County Board of Supervisors, and city officials, to study the seiche and to propose precautions to prevent future drownings.
It has been well established that seiche is the resonant oscillation of water in the form of a standing undulating long modal wave, and it occurs in enclosed bodies of water, which may have a number of natural resonances (resonance being the condition of maximum response to an applied periodic force forming "standing waves" of oscillation as shown in Fig.
In the simplest case of a seiche occurring where depth is constant across the basin, the wave speed is single valued and all permissible modes are harmonics of the fundamental.
Initially, the scientists found that their computer models could have predicted the five seiches associated with strong cold fronts but not the others, which occurred in conjunction with cold fronts marked by gradual changes in wind speed and direction.
Seiches, then, are the source of other rhythms known to coastal people--rhythms specific to certain harbors and bays, rhythms that contribute to the mystery of the sea, and, sometimes, to fear of the sea.
Deputy Interior Minister Esmail Najjar said the wave was estimated at more than three meters (10 feet) high, though that would be unusually big for a seiche and was probably an exaggeration.