Author(s): Yasuji Yamamoto; Mitsuhiro Sakikawa; Daisuke Honma; Shinji Kioka
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Abstract: Okhotsk Sea coast of Hokkaido, Japan, is known as the southern limit of sea ice, which forms in high-latitude waters and arrives at Hokkaido between January and March every year. In this study, observation was conducted using IPS (Ice Profiling Sonar) and ADCP (Acoustic Doppler Current Profiler), which have been adopted in recent years. As a result of analyzing data obtained in February 2001, sea ice mainly moved in a southeast direction along the coast, and the traveling speed was approximately 0.2 m/sec. A high correlation was observed between the traveling speed of sea ice, wind velocity and velocity of current in ocean. The cross section of sea ice passing over the equipment was also estimated by the draft and traveling speed. The maximum draft observed was 3.6 m, and the frequency of drafts of 2 m or deeper was 4% and those of 3 m or deeper was0.1%. It was confirmed that large-scale deformed ice formed by dynamic actions existed even in Okhotsk Sea coast of Hokkaido.
Year: 2002