書誌事項
- 公開日
- 2010-06-01
- DOI
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- 10.20965/jdr.2010.p0257
- 公開者
- Fuji Technology Press Ltd.
この論文をさがす
説明
<jats:p>The Ohya-kuzure landslide, one of three largest catastrophic landslides in Japan, is assumed to have been triggered by a strong earthquake and a large-scale debris terrace in a channel downstream from landslide. We verified the time of the landslide’s occurrence, its volume, and the amount of sediment supplied to the main river downstream. The landslide’s occurrence in 1707 was confirmed by historical documents and earthquake records of sediment disasters. The landslide’s size was estimated to be 94 million m<jats:sup>3</jats:sup>, from the geomorphic change in the debris terrace. Moreover, it was presumed that 33% of the sediment accumulating as a debris terrace (29 million m<jats:sup>3</jats:sup>) was eroded, and that a sediment volume of 17 million m<jats:sup>3</jats:sup> was supplied to the upstream region of the main river. Small-scale debris flows have been triggered recently in the source head of the landslide during heavy annual rainfalls. In 2006, a debris flow in Ichinosawa tributary with the most vigorous debris production and transport in the landslide was recorded during a typhoon. Hydrographs of the debris flow quantified by ultrasonic sensor and hydraulic pressure sensor supplemented video images.</jats:p>
収録刊行物
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- Journal of Disaster Research
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Journal of Disaster Research 5 (3), 257-263, 2010-06-01
Fuji Technology Press Ltd.