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Abstract
Spectral analysis of lake level records from Lake Wakatipu reveals significant energy in oscilations with periods near 52.0, 26.7, 18.5, 15.0 and 10.0 min. Comparison with periods calculated by numerical integration indicate that these periods correspond with the fundamental mode seiche for the whole length of the lake and the next four modes. The most energetic mode is not the fundamental but the second, with a period o; f 26.7 min, and this unusual situation is explained by the method of generation in this dog‐leg shaped lake.