Two types of rainfall conditions associated with shallow landslide initiation
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- Saito Hitoshi
- Department of Geography, Tokyo Metropolitan University Research Fellow of the Japan Society for the Promotion of Science
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- Nakayama Daichi
- Department of Geography, Tokyo Metropolitan University
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- Matsuyama Hiroshi
- Department of Geography, Tokyo Metropolitan University
書誌事項
- タイトル別名
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- Two Types of Rainfall Conditions Associated with Shallow Landslide Initiation in Japan as Revealed by Normalized Soil Water Index
- 公開日
- 2010
- DOI
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- 10.2151/sola.2010-015
- 公開者
- 公益社団法人 日本気象学会
説明
Two types of rainfall conditions for shallow landslide initiation are objectively identified in Japan. We examined rainfall intensity-duration conditions of 1,174 shallow landslides that occurred during 2006-2008 using the Normalized Soil Water Index (NSWI), which represents conceptual soil water contents. We classified rainfall in Japan into two types using principal component analysis: short-duration - high-intensity (SH) type, and long-duration - low-intensity (LL) type. Based on this classification, we proposed a new method herein for predicting shallow landslides resulting from the rapid increase of NSWI with short duration in the SH type, and from the gentle rise of NSWI followed by heavy rainfall with long duration in the LL type. We verified this method by analyzing the rainfall-induced shallow-landslide and debris disasters in 2009, for which we succeeded in predicting those of the SH and LL types, respectively, at an earlier stage of rainfall events. These results are important for shallow landslide disaster warnings in Japan.
収録刊行物
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- SOLA
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SOLA 6 57-60, 2010
公益社団法人 日本気象学会
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詳細情報 詳細情報について
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- CRID
- 1390282680199870976
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- NII論文ID
- 130004448509
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- ISSN
- 13496476
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- OpenAIRE
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- 抄録ライセンスフラグ
- 使用不可