- 著者
- 寺田 秀樹 仲野 公章 浅井 健一 山越 隆雄 金子 正則 石井 靖雄
- 出版者
- 社団法人 砂防学会
- 雑誌
- 砂防学会誌 (ISSN:02868385)
- 巻号頁・発行日
- vol.53, no.3, pp.52-57_2, 2000
An earthquake measuring 6.4 in Magnitude (M) on the Richter scale occurred at 16:02 on July 1, 2000, with an epicenter in the sea near Niijima and Kozushima Islands in the Izu island chain. It was followed by torrential rainfall caused by typhoon No.3 in July 7 and 8, and another earthquake measuring M 6.0 at 3:57 on July 9, with a hypocenter near the previous earthquake. They triggered many slope failures in Kozushima Island. The slope failures damaged some houses, and also produced a large amount of sediments on the beds of many streams.<br>In order to assess the risk of sediment-related disasters, the team of Erosion and Sediment Control Department in Public Works Research Institute has surveyed the state of slope failure deposits and erosion and sediment control facilities. The results of the surveys from July 4 to 6 and July 10 to 11 are as follows. 1) Slope failure sediments on the streambeds increase danger of debris flow disasters, because these streams have few erosion and sediment control facilities, except for Kozusawa. 2) Many slope failures and a few landslides were recognized in the surveyed area. Many of these failures occurred in the area of pyroclastic deposits. 3) The torrential rainfall by typhoon No.3 and the earthquake in July 9 widen the area of slope failure caused by the earthquake in July hand also caused new failures. It suggests that additional rainfall or earthquake will cause new failures and area extention of the failures which already occurred.
3 0 0 0 OA ブラジル統合自然災害リスク管理国家戦略強化プロジェクトでの取り組み
1 0 0 0 OA 豪雨・地震による斜面災害の高精度予測システムの開発
本研究では、大規模斜面災害に対する予測精度向上を目指して(1)最新の国土基盤情報データベースを導入した解析支援システムの構築(2)高精度な強震動予測手法の開発(3)地盤の飽和度が斜面流動に及ぼす影響の検討と(4)降雨による集水地形評価・危険斜面の簡易抽出・斜面崩壊危険度および流動範囲予測を組み合わせた多段階斜面崩壊・流動シミュレータの開発(5) 斜面崩壊危険度を地震動特性から予測する被害関数の構築、および(6)斜面崩壊に伴う道路インフラ等の被害の類型化と被害関数の構築を行った。