洞爺湖の湖陸風

概要

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As part of a series of observational studies, the effect of a caldera lake surrounded by the mountains and hills on the wind flow pattern over the lake was investigated. Particularly in this study, the observations of land and lake breeze were carried out on and around Lake Toya, and some features and the structures of these wind systems were noted. 1) Land and lake breeze was observed in the entire lake shore, and the mean speeds of these winds were found to be approximately 1-2 m/sec at lake shore. But the transition from land breeze into lake breeze was different at each site in mode and in time. 2) The maximum depth of the land breeze was about 100 m, and the lake breeze was approximately 150 m. The structures of these wind circulations were considered to be slightly twisted. The lake breeze was accelerated by the sea breeze from Uchiura Bay late in the morning. According as the sea breeze develops, however, the lake breeze was disrupted in the afternoon. 3) It is found that the lake breeze set in when the air was still cooler than water surface. This unique feature is explained in relation to the topography around the lake.
北海道大学の論文
1982-03-25