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地すべり危険度区分における空中電磁法の適用性
https://doi.org/10.24514/0002000064
https://doi.org/10.24514/0002000064dddcc525-1eda-454d-9e8d-357d44b0c1d5
| 名前 / ファイル | ライセンス | アクション |
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TRNIREJ202_197-204.pdf (339 KB)
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© 国立研究開発法人 農業・食品産業技術総合研究機構
National Agriculture and Food Research Organization, Japan |
| Item type | 紀要論文 / Departmental Bulletin Paper_03(1) | |||||||||||
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| 公開日 | 2024-03-08 | |||||||||||
| タイトル | ||||||||||||
| タイトル | 地すべり危険度区分における空中電磁法の適用性 | |||||||||||
| 言語 | ja | |||||||||||
| タイトル | ||||||||||||
| タイトル | Applicability of helicopter electromagnetic survey for landslide hazard assessment | |||||||||||
| 言語 | en | |||||||||||
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| 言語 | jpn | |||||||||||
| 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 | departmental bulletin paper | |||||||||||
| ID登録 | ||||||||||||
| ID登録 | 10.24514/0002000064 | |||||||||||
| ID登録タイプ | JaLC | |||||||||||
| 著者 |
中里, 裕臣
× 中里, 裕臣× 黒田, 清一郎
WEKO
1853
× 奥山, 武彦 |
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| 抄録 | ||||||||||||
| 内容記述タイプ | Abstract | |||||||||||
| 内容記述 | It is important to recognize the distribution of landslide blocks for the forecast and prevention of landslide disasters. Geological survey and air-photo interpretation are principal methods of regional scale investigations for evaluating the risk of landslides. However, it is necessary to understand not only the characteristic topography of landslides but also the sub-surface conditions of landslide bodies, and to evaluate a risk of landslides for improving the accuracy of disaster forecasts. The porosity and moisture content are expected to increase with the stage of failure within the landslide body. Therefore, landslide bodies seem to show a characteristic value of resistivity corresponding to the stage of failure in each landslide body due to dependence of the resistivity on the porosity and moisture content of the material. We propose the helicopter-borne electromagnetic method (HEM) as an effective way to evaluate the regional risk for landslide disasters, based on the results of the application of the HEM in a landslide area of the shear zone type, the Sanbagawa tectonic zone in Kochi Prefecture. The results of the HEM showed horizontally low apparent resistivity inside the landslide block, and showed vertically high apparent resistivity in deeper areas. These tendencies show that the distribution of a landslide soil mass can be estimated by the distribution of zones of low apparent resistivity. According to an examination of a landslide block based on borehole data and two-dimensional resistivity survey data, it was confirmed that the landslide body corresponded to a low resistivity part of 350 Ωm or less. Furthermore, we constructed an apparent resistivity cross section along a two-dimensional resistivity survey line based on HEM data acquired three-dimensionally, and showed that the resistivity distribution in both resistivity cross sections generally corresponded. Therefore, we clarified that the HEM could effectively determine the distribution of landslide bodies in the landslide areas of the shear-zone type. In this study, we performed an HEM survey of 22.3km survey lines in the range of 2.2 km2 within a flight time of 2 hours and 20 minutes. The use of such a highly efficient survey method will be expected to applied widely to landslide hazard assessment due to its improvement of the accuracy of section analysis and by developing an inversion technique in the future. |
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| 言語 | en | |||||||||||
| 抄録 | ||||||||||||
| 内容記述タイプ | Abstract | |||||||||||
| 内容記述 | 日本の国土は世界でも有数の変動帯に位置し，固結度の低い比較的新しい時代の地層が斜面を形成している。ここに地震震源域や火山帯が重なり，さらにはモンスーン帯という気候条件も重なり，国民は土砂災害と背中合わせの生活を強いられていると言っても過言ではない。自然災害による人的被害者数の推移を見ると，年々相当数の犠牲者が生じていることがわかり（古谷，1998），1967年～1998年間の土砂災害・洪水災害を合わせた斜面災害による犠牲者数は兵庫県南部地震を含む地震災害の犠牲者数に匹敵する。 そこで，本報告では土砂災害の防止・軽減のためには災害素因の面的把握手法の確立が必要であることを論じ，その一手法として空中電磁法を取り上げ，破砕帯地すべり地における適用事例から同法の有効性を示す。なお，本報告は交付金プロジェクト「集中豪雨によるため池等の災害発生機構の解明と予測技術の開発，H13～H15」の成果の一部をとりまとめたものである。空中電磁法探査の実施では，高知県長岡郡大豊町および大日本コンサルタント株式会社の関係各位に多大なご協力とご理解を賜った。ここに深く感謝の意を表する。 |
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| 言語 | ja | |||||||||||
| 書誌情報 |
ja : 農業工学研究所技報 en : Technical report of the National Research Institute of Agricultural Engineering 巻 202, p. 197-204, 発行日 2004-03-31 |
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| 出版者 | ||||||||||||
| 出版者 | 独立行政法人農業工学研究所 | |||||||||||
| 言語 | ja | |||||||||||
| 出版者 | ||||||||||||
| 出版者 | NATIONAL INSTITUTE FOR RURAL ENGINEERING INDEPENDENT ADMINISTRATIVE INSTITUTION | |||||||||||
| 言語 | en | |||||||||||
| ISSN | ||||||||||||
| 収録物識別子タイプ | PISSN | |||||||||||
| 収録物識別子 | 0915-3314 | |||||||||||
