Abstract
Many large landslides in the crystalline schist region of Shikoku Island, Japan, are susceptible to intense rainfall. Through the use of on-site monitoring systems, the activity of landslides and their meteorological triggers can be assessed. Continuous high-intensity rainfall was found to play a key role in provoking landslide movement. This paper investigates the influence of intense rainfall on the activity of crystalline schist landslides by examining rainfall and displacement of four typical landslides. By defining and calculating the effective rainfall and the relative landslide displacement, the relationship between intense rainfall and rainfall-induced landslide movement was analysed. Results indicate that the intense rainfall-induced landslide movement can be correlated with the effective rainfall. From these results, two rainfall thresholds were identified for the landslide risk management of Shikoku Island.
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Acknowledgements
The authors would like to thank the Ministry of Construction Works, the Japan Forestry Agency and the Civil Engineering Department of Kochi Pref. for the provision of data. Appreciation is also given to Dr. Gen Furuya of Kyoto University, for his kind instruction on field observation. The authors’ special thanks go to Prof. Casagli, Dr. Petley and Dr. Ibsen for their useful comments and advices used to revise the manuscript.
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Hong, Y., Hiura, H., Shino, K. et al. The influence of intense rainfall on the activity of large-scale crystalline schist landslides in Shikoku Island, Japan. Landslides 2, 97–105 (2005). https://doi.org/10.1007/s10346-004-0043-z
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DOI: https://doi.org/10.1007/s10346-004-0043-z