Other
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005bgsi...52...37s&link_type=abstract
Bulletin of the Geographical Survey Institute (ISSN 0373-7160), Vol. 52, p. 37 - 47 (March 2005)
Other
Geomorphology
Scientific paper
The occurence of full-depth snow avalanches (FDSAs) on slopes in Japanese mountain areas is indicated by narrow straight scratch patterns, called "avalanche furrows", on aerial photographs. Avalanche furrows show a semi-circular or U-shaped transverse profile as if they had been scored by a round chisel. They have a width of 2-4m and a depth of 1-3m and occur mainly on slopes with a 35°-45° inclination. Avalanche furrows are exposed on a smooth surface of bedrock and show striae produced by FDSAs. Aerial-photo interpretation over Japanese Islands shows that avalanche furrows are mainly distributed from Hokkaido to the Chugoku Mountains along the Japan Sea coast. The distribution of avalanche furrows corresponds to mountains with deep snow cover over 2m and increases with altitude. In other countries, wet snow avalanches occur mainly in polar and alpine areas with much colder climates. In contrast, FDSAs occur in temperate climates and at altitudes as low as 300m in Japan. The major factors controlling the formation of avalanche furrows in Japan are considered to be the temperate climate, heavy snowfall, steep slopes and poor vegetation.
Akiyama Kazuya
Sato Hiroshi P.
Sekiguchi Tatsuo
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