Mechanism and future risk of slope instability induced by extreme rainfall event in Izu Oshima Island, Japan
| Autor: | Shigeru Goto, Ikuo Towhata, Hiroshi Yamaguchi, Satoshi Goto, Shogo Aoyama, Takeshi Akima, Taro Uchimura, Junya Tanaka, Gonghui Wang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
021110 strategic
defence & security studies Atmospheric Science geography Hydrogeology geography.geographical_feature_category 010504 meteorology & atmospheric sciences Feature (archaeology) Lava Earth science 0211 other engineering and technologies 02 engineering and technology 01 natural sciences Instability Rainwater harvesting Volcano Natural hazard Earth and Planetary Sciences (miscellaneous) Drainage Geology 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Natural Hazards. 105:501-530 |
| ISSN: | 1573-0840 0921-030X |
| Popis: | A volcanic slope in Izu Oshima Island in Japan experienced a profound rain-induced disaster in October 2013. Since this slope had been stable for centuries except for minor failures, a special investigation was carried out on the cause. Because of its volcanic origin, the failed slope consisted of layers of ash, sand and lava. While the investigation concerned many disciplines, the present paper addresses one part of the geotechnical studies. The particular emphasis was put on the reason why some part of the slope “did not” fail because the post-disaster construction of infrastructures in the affected area relied on the future stability of the affected mountain slope. In line with this, another focus of the study was on the geohydrological feature of the underlying lava layer that possibly controlled the instability of the volcanic slope. It was concluded finally that the lava layer is pervious and allows drainage of infiltrated rainwater and that, only during extremely heavy rain, the subsurface lava topography triggered slope failure only in its “valley” parts. For 7 years after the disaster, the remaining parts of the slope have been stable as judged and many local infrastructures have been reconstructed. |
| Databáze: | OpenAIRE |
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