雷鳥沢なだれ調査報告

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タイトル別名
  • Snow Avalanche at Raicho Valley
  • ライチョウ サワナダレ チョウサ ホウコク

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抄録

In the midwinter of 1968, the mountain lodging house “Raichoso” halfway up Mt. Tateyama in the Japanese North Alps was destroyed by a snow avalanche, and nobody knows when it occurred.<BR>About 30 holes were made near the ruins of the house by melting snow with hot water which was led through a long tube from the “Jigokudani” hot spring. The debris layer containing the broken pieces of the house was easily distinguished from the naturally accumulated snow layers. In Fig. 2, the vertical length of each rectangle represents the depth of snow and the hatched part represents the location of the debris in snow. The heap of debris, as shown by Fig. 3, spread in the extension of the Raicho valley. The volume of debris was estimated at about 4. 3×104m3 and the mass about 2. 3×104 tons.<BR>The lodging house had been almost completely crushed by the avalanche, leaving only a part of the partially destroyed first floor. Fragments of the broken house were scattered about in the area of 100 m by 150 m.<BR>One of the requisite conditions for causing a large fresh snow avalanche is a continuous heavy snowfall. The depths of fresh snow observd at the weather stations in the vicinity of the Raicho valley are shown in Fig. 6, which reveals that at the Raicho valley it must have snowed heavily simultaneously with the neighboring area. The date of the avalanche was inferred from the location of the debris in snow as shown in Fig. 2 and from the integrated amount of precipitation at the Makawa Weather Station near the Raicho valley. Consequently, it is presumed that the heavy snowfall on January 15 caused the snow avalanche at the Raicho valley.

収録刊行物

  • 雪氷

    雪氷 33 (2), 71-77, 1971

    公益社団法人 日本雪氷学会

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