Koichi AKIYAMA, Taro UCHIDA, Keiji TAMURA and Koji KAMEE
Abstract
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 ‚S landslides occurred in
a heavy rain of June, ‚P‚X‚X‚X. We prepared five datasets about soil thickness which
have different spatial resolution. We calculated spatial distribution of critical
steady]state rainfall ircj required to cause slope instability. If interval
of measurement of soil thickness was high enough, the spatial distribution of
critical steady]state rainfall ircj were consistent with the spatial pattern
of shallow landslides triggered by the heavy rainfall of June, ‚P‚X‚X‚X. While,
the critical steady]state rainfall ircj 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.
Key wordsFshallow landslide, Soil thickness, slope gradient, upslope contributing
area, penetration test