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図書 |
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京都大学防災研究所編
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図書 |
図書
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田畑茂清, 水山高久, 井上公夫著
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図書 |
図書
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土砂害対策研究会編
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図書 |
図書
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砂防学会
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図書 |
図書
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全国治水砂防協会
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図書 |
図書
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国土庁防災局
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図書 |
図書
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芦田和男編
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| 8.
論文(リポジトリ) |
論文(リポジトリ)
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古谷, 元 ; 末峯, 章 ; 丸井, 英明 ; 佐藤, 修 ; 原, 龍一 ; 岡本, 敦
概要:
We carried out investigation of soil temperature at one-meter depth and water quality (water temperature and electric conductivity) to make clear relationship between slope failure and groundwater flow at source area of debris flow in the
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Tobinosu-dani-A stream, Zentoku, Tokushima, Japan. Furthermore, we investigated water temperature and electric conductivity of springs, at Tobinosu-dani-C stream, boreholes and underflow at Z6 block of Zentoku landslide to grasp the origin of groundwater. The results of our investigations are as follow. The groundwater flows at the source area of Tobinosu-dani-A stream are under flow type, which is flowing from outside of basin. Direction of these flows are Northeast to Southwest, which may be controlled to relative high permeability structure in the bedrock. The slope failure at source area of debris flow in this stream is caused by underflow from North to South.
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| 9.
論文(リポジトリ) |
論文(リポジトリ)
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古谷, 元 ; 末峯, 章 ; 小山内, 信智 ; 原, 龍一 ; 佐藤, 修 ; 小松原, 岳史
概要:
Many debris flows caused by heavy rainfall have occurred at mountains in crystalline schist area, Shikoku Island, Southwestern Japan. The typical movement form of debris flow caused by heavy rainfall in mountainous area is
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fluidizing of soil mass from source area of debris flow to down slope (Stream). The debris flow at Tobinosu-dani stream in Zentoku, Nishiiyayama village on 29 June 1999 is this type of movement form. Therefore, it is important to make clear about occurrence mechanism of slope failures at source area of debris flow. Then, we carried out investigations of soil temperature at one-meter depth, water temperature and electric conductivity of springs and boreholes at the source area in the Tobinosu-dani stream and the Zentoku landslide. The results of our investigations are as follow. 1) There are two types of groundwater flows at the source areas of debris flows in the Tobinosu-dani stream that cause slope failure. One type is underflow changed by groundwater flow in deep layers with low value of electric conductivity. The other type is fissure water like groundwater vein-streams from deep layer with one digit higher value of electric conductivity than the underflow. 2) It is presumed that different of value of electric conductivity between underflow and fissure water is based on the different storage time (groundwater pass). Depth of the fissure water supply, especially, is corresponding to the approximate depth of the sliding surface (or bed rock) in the Zentoku landslide.
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| 10.
論文(リポジトリ) |
論文(リポジトリ)
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丸井, 英明 ; 海堀, 正博 ; 木村, 正信
概要:
Hazard map is a topographic map on which dangerous areas threatened by debris flow, slope failures, landslides, snow ava
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lanches and so on are optically expressed by red and yellow color zoning. In order to introduce necessary arrangement for warning and evacuation system or appropriate land use decision as so called soft countermeasures against natural disasters, it is quite important and effective to prepare hazard map as basic data and information for the implementation of such soft countermeasures. Also in Japan in recent years hazard maps and mapping methods are gradually introduced under the cooperative works among state, prefectural and local governments. Nowadays hazard maps are already exhibited to the public in Japan. However real zoning results of hazards by natural disasters are not expressed in hazard maps but only dangerous torrents or points are expressed in restricted manner. On the contrary, in Austria that has relatively long history and much practical experiences in the field of hazard mapping, there exist comprehensive arrangement and exhibition of hazard maps to the public under a certain legal background since 25 years ago. A special workshop on “Hazard Mapping Methods” was organized by the federal authority for torrent and avalanche control of the Ministry of Agriculture and Forestry at Rauris in the Federal State Salzburg in Austria from15th to 18th June 1998. The Workshop was arranged under the framework of IUFRO subdivision S8.04 for Natural Disasters with special focusing on the practical methods for hazard mapping. We had an opportunity to attend to this workshop and to discuss with foreign experts in this fields from Austria, Germany, Republic China, Italy and Slovenia. This Report is to give general informations on hazard mapping system in Austria and further a short introduction of the workshop itself and some important remarks on the main discussion points about the methods of the hazard mapping.
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