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Updated: May 8, 2025
Forel of Switzerland has proved that the water of lakes oscillates almost constantly from one bank to another, and this not only from end to end, but also from side to side. Thus the Swiss lakes have two Seiches, as they are called, in opposite directions. The sewage schemes have had a good many indignant critics and fervent defenders. Of the former is Mr.
Finally, Arago maintained that Seiches may arise from various causes, and traced the analogy between them and certain remarkable oscillations of the sea, including those arising from earthquakes. But physical science is indebted to Professor F.A. Forel, of Lausanne, for the most complete and exhaustive investigation in relation to the phenomena of Seiches.
It is evident, however, that until arrangements are consummated for recording systematic observations on the variations of the level of this Lake, we cannot expect that its Seiches will be detected. Of course, self-registering gauges would give the most satisfactory results; but any graduated gauge, systematically observed, would soon furnish evidence of the phenomenon.
If in one of these points the barometer stands a few lines lower than in the other, the water will rise where it finds the least pressure of air, and this local intumescence will continue, till, from the effect of the wind, the equilibrium of the air is restored. M. Vaucher thinks that the tides in the lake of Geneva, known by the name of the seiches, arise from the same cause.
These Seiches were first signalized in the Lake of Geneva in 1730, by Fatio de Duillier, who ascribed them to the checking of the flow of the waters of the Rhone on the shoal near Geneva by the force of the wind at mid-day.
For the longitudinal Seiches, "Hot Springs," at the northern extremity of the Lake, or "Lake House," at the southern end, would be eligible stations for gauges; and for the transverse Seiches, Glenbrook, on the eastern shore, or Capt. McKinney's on the western margin, would afford good stations. As far as I am aware, true Seiches have never been observed in any of the American lakes.
In no portion of Lake Tahoe did I observe any of the green tints, except where the light-colored bottom was visible. This was, probably, owing to the circumstance that no considerable quantity of suspended matter existed in any of the waters observed. Rhythmical Variations of Level in Lakes: or "Seiches."
He, moreover, established that Seiches, more or less considerable, occur in all the Swiss lakes; and that they take place at all seasons of the year, and at all times of the day; but, in general, more frequently in spring and autumn.
The disturbances of hydrostatic equilibrium which generate Seiches may be produced by a variety of causes. Observations show that the most frequent and evident of these causes are variations of atmospheric pressure and local storms.
Perhaps these lakes may be too large to manifest the uninodal rhythmical oscillations which have been so successfully studied by Forel in the smaller lakes of Switzerland. Be this as it may, there can be no doubt that Lake Tahoe is a body of water in all respects adapted for the manifestation of this species of oscillation; and that, like the Swiss lakes, it is subject to Seiches.
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