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Slow Mass Movement in the Taisetsu Mountains, Hokkaido, Japan

Author

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  • Tatsuaki Sato
  • Yoshimasa Kurashige
  • Kazuomi Hirakawa

Abstract

Slow mass movement on an alpine slope was monitored by a strain‐probe method in early winter 1995 at Mt Kumagatake, Hokkaido, northern Japan, and compared with the time variation of ground temperature and degree of water saturation of soil. Downslope soil displacement was obtained only in mid‐September in the surface layer (shallower than 5 cm), although diurnal freeze–thaw cycles occurred from mid‐ to late September. Before mid‐September, the degree of saturation was high after rainfall events, but diurnal freeze–thaw events did not occur. This suggests that frost creep takes place only when diurnal freeze–thaw occurs in conjunction with nearly saturated soil. © 1997 John Wiley & Sons, Ltd. Pendant le début de l'hiver 1995, le lent mouvement affectant une forte pente du Mont Kumagatake (Hokkaido, nord du Japon) a été observé au moyen de jauges de contrainte. Les données obtenues ont été comparées avec les variations de température du sol et le degré de saturation en eau de celui‐ci. Une descente évidente du sol a été observée dans la couche de surface (profondeur inférieure à 5 cm) seulement à partir du milieu de septembre, lorsque se sont produits des cycles diurnes de gel et de dégel. Avant la mi‐septembre, le degré de saturation du sol était souvent élevé après des événements pluvieux mais des alternances diurnes de gel‐dégel n'ont pas eu lieu. Ces résultats suggèrent que le “frost creep” se produit seulement quand des alternances de gel‐dégel diurnes affectent un sol est presque saturé. © 1997 John Wiley & Sons, Ltd.

Suggested Citation

  • Tatsuaki Sato & Yoshimasa Kurashige & Kazuomi Hirakawa, 1997. "Slow Mass Movement in the Taisetsu Mountains, Hokkaido, Japan," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 8(3), pages 347-357, September.
  • Handle: RePEc:wly:perpro:v:8:y:1997:i:3:p:347-357
    DOI: 10.1002/(SICI)1099-1530(199709)8:33.0.CO;2-U
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