An ice-ridge line more than 2000 m long was found out in a closed, deep lake, Lake Kuttara, Hokkaido, Japan, in the ice-covered season of 1995. In order to clarify when and how the ice-ridge line built up, the meteorology and the ice and water temperatures were monitored, and the density, thermal conductivity and thickness of the covered ice were measured in January -March 1995. The covered ice on 4 and 5 March 1995, 5 which correspond to the period with the thickest lake ice, consisted of snow ice 0.05 to 0.07 m thick and candle ice 0.18 to 0.21 m thick. Numerical simulations for the ice thickness and ice temperature were carried out by using a one-dimensional, unsteady three-layer model. The simulated results, which were reasonable to the observations, state that, due to the ice contraction and expansion, the ice-ridge line started to construct on 2 February and was completed on the next day. 10
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