We study seiche oscillations under ice cover in Lake Valunden. The lake is connected to the fjord in Spitsbergen by a narrow (10~m) channel. The length of the lake is 1300~m and its width is 600~m. Mean depth of the lake is 10--11~m. Forcing of seiches in the lake occurs due to the tides. Wind does not have a notable forcing effect. Tidal currents raise and lower the ice cover plate in the lake and the ice cover oscillates with its natural seiche frequencies. Two modes of seiche oscillations exist in the lake. The longitudinal mode has a period of 240--266~s and the transversal mode has a period of 128--145~s.
Seiches under ice, Lake Valunden, Spitsbergen, tidal forcing
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