Fluctuations of Pore-water Pressure in a Landslide of Heavy Snow Districts

• DOI: 10.3313/jls1964.37.2_10
• Publication Date: 2011-12-27T14:09:35Z
• Authors: Sumio MATSUURA
• Keywords: Meltwater; Snow field; Water equivalent; Snowmelt

Pore-water pressure fluctuations were observed in a Tertiary landslide, which is located heavy snow district, using an automated data acquisition system. Meltwater and/or rainfall (MR (a/o)), snow-related factors including water equivalent of snow, and landslide movement simultaneously obtained. The results observation for two consecutive years showed the long-term effects load on pore-water pressure, such as gradual rise accumulated. An investigation time-lag response ratio against MR (a/o) pre-snow, post-snow cover periods revealed that was not uniform before started to accumulate, but distribution curve with clear peak during late periods. value integrated one event investigated, followings results. relationship between diverse pre-snow high correlation period, gradually decreased accumulated, only tenth period remained low even after had disappeared required 500 600 hours return level period. Observations inside mass changes are quite different from those other These suggest hydrologic coefficients strongly affected by cover.