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タイトル: | Nepal Landlideをもたらしやすいmonsoon循環 |
その他のタイトル: | Monsoon Circulation that could Induce Landslides in Nepal |
著者: | 谷田貝, 亜紀代 ![]() 鈴木, 隆太郎 ![]() 安藤, 千晶 ![]() FROUDE, Melanie PETLEY, David 増田, 南波 ![]() 千木良, 雅弘 ![]() |
著者名の別形: | YATAGAI, Akiyo SUZUKI, Ryutaro ANDO, Chiaki FROUDE, Melanie PETLEY, David MASUDA, Minami CHIGIRA, Masahiro |
キーワード: | Landslide 精確な降水 ヒマラヤ山脈 モンスーン循環 landslides accurate precipitation Himalayas monsoon circulation |
発行日: | Sep-2018 |
出版者: | 京都大学防災研究所 |
誌名: | 京都大学防災研究所年報. B |
巻: | 61 |
号: | B |
開始ページ: | 589 |
終了ページ: | 595 |
抄録: | The APHRODITE precipitation data was used to investigate the relationship between patterns of monsoon rainfall and fatal landslide occurrence in Nepal. Rainfall from the South Asian Summer Monsoon (June to September) triggers on average 26 fatal landslide events each summer monsoon season. High peak annual rainfall corresponds with densely populated, mountainous districts in Nepal. Annual monsoon rainfall (1985-2014) was compared with the South Asian Summer Monsoon Index (SASMI). Results showed that when SASMI is negative (weak), monsoon rainfall is higher in central hill and mountain districts. The weak monsoon trough over Northern India, means moist air travels north and converges on central Nepal. Decomposing the July rainfall series using empirical orthogonal function (EOF) analysis identifies variability in the position of convergence over central Nepal when SASMI is negative. EOF 1 and 2 explain 52.8% and 15.5% of spatial variance in the data. High positive values in EOF 1 correspond with strong convergence and high rainfall in the west and south-west districts in Nepal. Negative values in EOF 2 correspond with high rainfall in the west, positive values correspond with high rainfall in the east. More fatal landslides occur when SASMI is negative, EOF 1 is positive and EOF 2 is negative. Research is ongoing to explore rainfall-thresholds for the initiation of landslides. |
URI: | http://hdl.handle.net/2433/235872 |
関連リンク: | http://www.dpri.kyoto-u.ac.jp/publications/nenpo/ |
出現コレクション: | Vol.61 B |
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