Journal of the Japan Landslide Society
Online ISSN : 1882-0034
Print ISSN : 1348-3986
ISSN-L : 1348-3986
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Original article
  • Masanori KOHNO, Tatsuya NOGUCHI, Tsuyoshi NISHIMURA
    2020 Volume 57 Issue 1 Pages 3-11
    Published: 2020
    Released: February 19, 2020

      This study suggested landslide hazard mapping method in the Chugoku Region using analytic hierarchy process (AHP) method and geographic information system (GIS). A landslide hazard assessment system for landslides used here is based on landslide distributions of about 16,000 places in the Chugoku Region, Japan. We considered relationship between landslide distribution and factor of landslide hazard (elevation, slope angle, slope type, catchment degree, geology and vegetation). These relations are introduced to pairwise comparisons of factors in the AHP method. Landslide hazard rank is evaluated based on AHP. A landslide hazard map is created based on the landslide hazard rank of Ⅰ-Ⅴ. The landslide distributions are almost consistent with the landslide hazard rank. These results provide a practical method that will be useful for evaluating landslide hazards.

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Research note
  • Shunsuke ODAGAWA, Wataru TAKESHITA, Masaru TOUHEI, Kazuhiro FUJIWARA
    2020 Volume 57 Issue 1 Pages 12-18
    Published: 2020
    Released: February 19, 2020

      In areas hit by landslide, the fluctuation characteristics of the groundwater level may change. This study used Bayesian optimization to estimate the parameters of a groundwater level reproduction model under the assumption that they are time-varying coefficients. Then, we used parameter fluctuations and functions to evaluate how the groundwater level fluctuation characteristics changed over a specific analysis period. We applied this method to a landslide area where a groundwater drainage works were constructed, reproduced the groundwater level fluctuation, and evaluated the changes in the characteristics of the groundwater level fluctuation. Changes in groundwater level are shown to be accurately reproduced by varying each parameter. Furthermore, the tendency of parameter fluctuation indicated that the drop amount in groundwater level during no rainfall was increased after groundwater drainage works.

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