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平成30年7月豪雨により愛媛県南西部で発生した斜面崩壊の規模と分布の特徴
https://doi.org/10.24732/nied.00002157
DOI
41e4df16-5658-41e0-bb53-a06a6d78adfd
名前 / ファイル | ライセンス | アクション |
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Item type | 学術雑誌論文 / Journal Article(1) | |||||||||||||||||
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タイトル | ||||||||||||||||||
言語 | ja | |||||||||||||||||
タイトル | 平成30年7月豪雨により愛媛県南西部で発生した斜面崩壊の規模と分布の特徴 | |||||||||||||||||
タイトル | ||||||||||||||||||
言語 | en | |||||||||||||||||
タイトル | Characteristics of the Magnitude and Distribution of Landslides Induced by the Heavy Rain Event of July 2018 in the Southwestern Part of Ehime Prefecture, Japan | |||||||||||||||||
言語 | ||||||||||||||||||
言語 | jpn | |||||||||||||||||
キーワード | ||||||||||||||||||
言語 | ja | |||||||||||||||||
主題Scheme | Other | |||||||||||||||||
主題 | 降雨による斜面崩壊,雨量分布,地質境界,土地利用 | |||||||||||||||||
キーワード | ||||||||||||||||||
言語 | en | |||||||||||||||||
主題Scheme | Other | |||||||||||||||||
主題 | Rainfall-induced landslide,Rainfall distribution,Geological boundary,Land use | |||||||||||||||||
資源タイプ | ||||||||||||||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||||||||
資源タイプ | article | |||||||||||||||||
ID登録 | ||||||||||||||||||
ID登録 | 10.24732/nied.00002157 | |||||||||||||||||
ID登録タイプ | JaLC | |||||||||||||||||
著者 |
木村 誇
× 木村 誇
× 若月 強
× 山田 隆二
× 井口 隆 |
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抄録 | ||||||||||||||||||
内容記述タイプ | Abstract | |||||||||||||||||
内容記述 | 平成30年7月豪雨によって愛媛県南西部で発生した土砂災害の現地調査を行うとともに,その主な原因となった斜面崩壊の規模と分布の特徴を分析した.豪雨直後に撮影された空中写真を判読した結果,調査地域の約47 km2の範囲内で計2,453箇所(総面積810,920 m2)の崩壊地が抽出された.調査地域の中央にある秩父帯と四万十帯の地質境界を挟む南北で降雨強度や総雨量にほとんど違いがなかったにもかかわらず,南側の四万十帯に集中して多数の斜面崩壊が発生していた.四万十帯の中では,砂岩の領域で最も多くの崩壊が発生していた.それらの大半は面積100 m2未満の崩壊であり,果樹園としての利用されている斜面に集中していた.一方で,面積1,000~10,000 m2オーダーに及ぶ比較的規模の大きな崩壊も同時に発生していた.それらはこの地域の四万十帯砂岩に特徴的な節理の発達により,分離の進行した岩盤の深層崩壊であった This report presents characteristics of the landslide magnitude and distribution in the southwestern part of Ehime Prefecture, according to field survey and geospatial analysis results on landslides and related sediment disasters caused by the heavy rain event of July 2018. We identified 2,453 landslides (Total area of 810,920 m2) within the study area of about 47 km2 using aerial photographs taken just after the rain event. Although there were little differences in rainfall intensity and total rainfall between the north and south side of the geological boundary of the Chichibu and Shimanto Belt, which was located at the center of the study area, landslides concentrated in the Shimanto Belt of the south side. In the Shimanto Belt, landslides were the most frequent in sandstone area. Most of the landslides were less than 100 m2 and concentrated on slopes used for orchards. Relatively large-sized landslides with the order of 1,000-10,000 m2 simultaneously occurred in the sandstone area. They included deep-seated slides of rock mass detached by joints, which are common features of the sandstone in this region. |
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言語 | ja | |||||||||||||||||
書誌情報 |
ja : 主要災害調査 en : National Disaster Research Report 号 53, p. 67-82, 発行日 2020-03-26 |
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出版者 | ||||||||||||||||||
言語 | ja | |||||||||||||||||
出版者 | 防災科学技術研究所 | |||||||||||||||||
収録物識別子 | ||||||||||||||||||
収録物識別子タイプ | EISSN | |||||||||||||||||
収録物識別子 | 1347-7498 |