The long‐period internal waves in Lake Biwa

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Abstract
The long‐period internal wave in a two‐layered model of Lake Biwa is treated numerically by the use of linear hydrodynamic difference equations for the equivalent volume transport rate and elevation.Fourier analysis for the calculated time series of the interface at 29 sampling points in the model lake shows that the wave of the fundamental mode has a period of 66.1 h, about the same as the period of longitudinal internal seiches without the effect of the earth’s rotation, and that the wave progresses along the shore in a counterclockwise direction with an apparent phase velocity of about 1.5 km h−1.Such rotatory behavior of the internal wave is consistent with the results of spectral analysis of the temperature records and with the result of an approximate analytical solution of the two‐layered rotating rectangular lake.

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