Influences of the snow cover on landslide displacement in winter period: a case study in a heavy snowfall area of Japan

Environmental Earth Sciences volume 76, Article number: 362 (2017) Cite this article

Abstract

The displacement of a relatively small reactivated landslide in a snowy area in Japan was monitored over a long period. The displacement rate of the landslide, which was approximately of 20 mm d−1 before the formation of snow cover, decelerated drastically during the continuous snow cover period every winter period. Possible causes included reduction in the amount of water that reached the ground surface (MR: meltwater and/or rainwater) and increase in snow load. Given that the actual displacement of the landslide was far below the predicted value based on the relationship between landslide displacement and MR immediately before the continuous snow cover period, the deceleration of landslide displacement was more likely attributable to the increase in snow load than to the reduction in MR. An investigation of the link between snow load and landslide displacement showed a negative logarithmic relationship. A dynamic analysis based on the limit equilibrium method showed that snow load increases the effective normal stress and the stability of a landslide in which the mean inclination angle of the slip surface is smaller than the internal friction angle. The stability of the actual slope was also analyzed by conducting soil tests on samples collected at the site and using the resultant parameters. The analysis also showed that the increase in snow load increases the safety factor and reduces the landslide displacement. The displacement of a relatively small landslide that has a shallow slip surface was found to be greatly influenced by snow cover.

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Affiliations

  1. DPRI: Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan

    Sumio Matsuura & Hikaru Osawa

  2. FFPRI: Forestry and Forest Products Research Institute, Forestry Agency, Tsukuba, Ibaraki, Japan

    Takashi Okamoto & Shiho Asano

  3. JCE: Japan Conservation Engineers & Co., Ltd., Minato, Tokyo, Japan

    Tatsuya Shibasaki

Authors
  1. Sumio Matsuura
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  2. Takashi Okamoto
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  3. Shiho Asano
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  4. Hikaru Osawa
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  5. Tatsuya Shibasaki
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Correspondence to Sumio Matsuura.

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Matsuura, S., Okamoto, T., Asano, S. et al. Influences of the snow cover on landslide displacement in winter period: a case study in a heavy snowfall area of Japan. Environ Earth Sci 76, 362 (2017). https://doi.org/10.1007/s12665-017-6693-7

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Keywords

  • Snow load
  • Landslide displacement property
  • Stability analysis
  • Effective normal stress
  • Reactivated landslide