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Heavy rain types for triggering shallow landslides in South Korea

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  • Heavy rain types for triggering shallow landslides in South Korea
  • Kim, Suk-Woo; Chun, Kun-Woo; Otsuki, Kyoichi; Shinohara, Yoshinori; Kim, Man–Il; Kim, Min–Seok; Lee, Dong–Kyun; Seo, Jung–Il; Choi, Byoung–Koo
  • Kyushu University


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Title Heavy rain types for triggering shallow landslides in South Korea
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Material Type Articles
Author(English)

Kim, Suk-Woo; Chun, Kun-Woo; Otsuki, Kyoichi; Shinohara, Yoshinori; Kim, Man–Il; Kim, Min–Seok; Lee, Dong–Kyun; Seo, Jung–Il; Choi, Byoung–Koo

Publisher

[Fukuoka, Japan] : Kyushu University

Date 2015-02
Journal Title; Vol./Issue Journal of the Faculty of Agriculture, Kyushu University:vol. 60(no. 1)
Subject Country South Korea(Asia and Pacific)
Language English
File Type Link
Subject Territorial Development < Environment
Holding Kyushu University
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Abstract

This study aimed to elucidate the differences in the tendency for landslides to occur according to heavy rain types in summer in South Korea. For this, the rainfall intensity–duration (I–D) relationship and the differences in I–D relationship by three representative heavy rain types (convective rainstorm, monsoon rain and typhoon rain) were analyzed statistically, based on the corresponding hourly rainfall data for 478 shallow landslides occurred through South Korea during 1963–2012. In the quantile regression analysis of the I–D relationship for triggering landslides, the regression line of the 50th percentile of each heavy rain type showed notable differences, and convective rainstorms showed the highest rainfall intensity for the same duration, followed by monsoon and typhoon rains. While the difference was remarkable in the rainfall duration range of 4–20 h, it tended to decrease with an increase in the duration, suggesting that the effects of rainfall intensity on landslide occurrence gradually became insignificant due to an increase in soil water content. (The rest omitted)