宗谷地方礼文島のなだれ

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This is a report on the avalanche hazard area of Rebun-island, northern Hokkaido, researched on March and August in 1966.<BR>1. There are slopes of marine terraces along the coast, on which snow-cornice and -drift are usually formed by heavy wind in winter. They often developed to snow avalanches and caused large damages.<BR>2. From late February to early March in 1966, air temperature became very high and many ground avalanches broke out. The layer of depth hoar or of wet granular appeared to play an important part in these avalanches formation and release. Potential Magnitude (P.M.) of these avalanches were generally 3.0-4.0 and maximum 5.1.<BR>3. The earth wind-baffle on the terrace is successful. On the longer slope, however, it is necessary to make both, the wind-baffle on the terrace and the defence structure in the sliding zone.
社団法人日本雪氷学会の論文