論文
土層厚の計測密度が表層崩壊の発生予測に及ぼす影響
キーワード:
shallow landslide,
Soil thickness,
slope gradient,
upslope contributing area,
penetration test
2011 年 64 巻 1 号 p. 3-10
詳細
2011 年 64 巻 1 号 p. 3-10
In this study, we investigated effects of interval of measurement of soil thickness on prediction of shallow landslide susceptibility. Study area is the Aratani district, the West Hiroshima mountain range, where 4 landslides occurred in a heavy rain of June, 1999. We prepared five datasets about soil thickness which have different spatial resolution. We calculated spatial distribution of critical steady-state rainfall (rc) required to cause slope instability. If interval of measurement of soil thickness was high enough, the spatial distribution of critical steady-state rainfall (rc) were consistent with the spatial pattern of shallow landslides triggered by the heavy rainfall of June, 1999. While, the critical steady-state rainfall (rc) could not explain the location of shallow landslides at the point where we did not measure soil thickness. Based on these analysis, we considered measurement intervals of soil thickness have to be shorter than width of the old shallow landslide scars.
