Taro UCHIDA, Nobuyuki MORI, Keiji TAMURA,Hideki TERADA, Shigetaka TAKIGUCHI and Koji KAMEE
Abstract
In this study, we showed new data and proposed new method to analyze shallow
rapid landslide susceptibility. We linked a simple hydrological model and the
infinite slope stability model to calculate critical steady]state rainfall required
to cause slope instability. The model was applied to a steep forested headwater
of Hiroshima Seibu Mountains, western Japan. We measured soil thicknesses at
173 points in the catchment using a portable penetration test. We also measured
stream flow rate and soil pore water pressures. If we used the data about soil
thickness measurements and hydrological observations, the spatial distribution
of critical steady]state rainfall were consistent with the spatial pattern of
shallow landslides triggered by the heavy rainfall of June, 1999. However, if
these data were not available, the spatial distribution of critical steady]state
rainfall were not conjunction with the spatial pattern of landslides.
Key wordsFshallow landslide, soil thickness, hydrological observation, Hiroshima,
landslide location