Quantitative assessment on the influence of heavy rainfall on the crystalline schist landslide by monitoring system -case study on Zentoku landslide, Japan |
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| Authors: | Yong Hong Hiromasa Hiura Kazuo Shino Kyoji Sassa Hiroshi Fukuoka |
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| Institution: | (1) United Graduate School of Agricultural Sciences, Ehime University, B200, Monobe Nankoku Kochi, 783-8502, Japan;(2) Faculty of Agriculture, Kochi University, Nankoku Kochi, 783-8502, Japan;(3) Research Center on Landslides, Disaster Prevention Research Institute, Kyoto University, Gokasho 611-0011, Uji Kyoto, Japan |
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| Abstract: | On Shikoku Island, which is one of the four main islands of Japan, a large number of large-scale crystalline schist landslides have been revealed and are being monitored by an observation system. Seasonal heavy rainfall is the most active meteorological factor that can threaten the stability of this kind of site-specific landslide. In this paper, on the basis of the study of the rainfall-related behavior of a typical crystalline schist landslide, the Zentoku landslide, by analyzing the precisely and continuously observed piezometric and movement data, a method was developed to quantitatively assess the effect of heavy rainfall on a large-scale landslide. The results indicated that heavy rainfall-induced landslide displacement shows good correlation with the variation of groundwater levels. Variations of groundwater level have been simulated with the use of a tank model. The simulation using this model permits the change in water levels for future rainfall events to be predicted. By combining the predicted results with the empirical relation between displacements and water levels, rainfall-induced landslide movement during extreme rainfall events can be estimated in advance. The effect of heavy rainfall on sliding behavior can be quantified in terms of the change in displacement. Thus warning information or advisories for the local residents can be provided. |
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| Keywords: | Large-scale landslide Crystalline schist Heavy rainfall Tank model Heavy rainfall-induced displacement (HRID) |
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