An Evaluation of Landslide Susceptibility of the Sai-River Basin to the West of Nagano City
抄録
A large number of landslides have occurred in the Sai-River Basin of the western part of Nagano city and farther west. In such a landslide concentrated area, an evaluation of landslide susceptibility is necessary in order to give priority in the defensive works. In this study, the quantification method is applied to evaluate the landslide susceptibility in the Sai-River Basin to the west of Nagano City, using topographical and geological items. As the result of analyses, high category weights which increase landslide susceptibility are clearly recognized in the following categories: (1) the bedrock consists of mudstones; (2) the sliding block consists of sandy or clay soils; (3) and there exist some swamps. Thus 82% reliability in sorting out the seriously susceptible zones from the average susceptible zones of the landslide was calculated.
長野西部犀川流域の地すべり地危険度評価
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