Geological approach to the evaluation of landslide hazard on the basis of history, geology, and geomorphology
Geological approach to the evaluation of landslide hazard on the basis of history, geology, and geomorphology
批准号:
17204044
负责人:
CHIGIRA Masahiro
金额:
$18.14万
依托单位:
依托单位国家:
日本
项目类别:
Grant-in-Aid for Scientific Research (A)
财政年份:
2005
资助国家:
日本
项目状态:
已结题
起止时间:
2005 至 2007
中文摘要
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英文摘要
We investigated landslide distribution before and after rainstorm hazard events and made detailed geological survey, and clarified that their distribution is strongly controlled by geology. We thus demonstrated that landslide susceptibility in a given area can be evaluated in the context of geology. We have succeeded to clearly find old landslide scars hidden by trees by using the airborne laser scanner. We applied this technique to the areas where numerous landslides occurred in a distributed manner, and found that these areas had also many landslide scars before the events. This indicates that these areas have characteristically high susceptibility to landslide. Our geological investigation also clarified that these high susceptibility is due to characteristic weathering profiles or geological structures. These characteristic weathering profiles were found for unwelded ignimbrite, alternating beds of sandstone and mudstone of the Cretaceous Izumi Group, and granitic rocks. Unwelded ignimbrite is weathered to form a profile with a capillary barrier at its base and weight increase and suction decrease are the main causes of landslide occurrence. Alternating beds of sandstone and mudstone we studied were deeply weathered and intensely weathered materials were loosened near the slope surface to form a soil layer to slide by suction decrease and increase of positive pore pressure. Granitic rocks are weathered in different ways for granite and granodiorite, and decomposed granite is most susceptible to landslide. Granodiorite, however, is also susceptible to landslide when it is micro-sheeted. Specific geological structures of storm deposits on lower shoreface, in which thin clay beds are intercalated in highly permeable sands, provide preferable condition to landslide. Weathered volcanic ash burying small valleys in highly weathered andesitic rocks is also susceptible to landslide induced by rainstorms.
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豪雨により表層崩壊が多発した地域の地質・地形学的研究-和泉層群分布地域を例として
暴雨地表塌陷多发区地质地形研究——以泉组区为例
DOI:
--
发表时间:
2007
期刊:
日本応用地質学会平成19年度研究発表会講演論文集
影响因子:
--
作者:
[Masumoto, Y., 松澤真・千木良雅弘]
通讯作者:
松澤真・千木良雅弘
Prediction of catastrophic large landslide sites and estimation of shallow landslide hazards induced by rainstorms-from the experiences of recent landslide hazards in Japan.
特大滑坡灾害地点预测及暴雨引发的浅层滑坡灾害评估——来自日本近期滑坡灾害的经验
DOI:
--
发表时间:
2006
期刊:
Disaster Mitigation of Debris Flows Slope Failures and Landslides, Edited by Marui, H., et. al., UNIVERSAL ACADEMY PRESS, INC. 1
影响因子:
--
作者:
[Miyazoe, T.and Nishiyama T., Masahiro CHIGIRA]
通讯作者:
Masahiro CHIGIRA
Characterization of Landslides by using Precise DEM Data in Ribira, Hokkaido
使用精确的 DEM 数据表征北海道里比拉的山体滑坡
DOI:
--
发表时间:
2006
期刊:
Disaster Mitigation of Debris Flows Slope Failures and Landslides, Edited by Marui, H., et. al., UNIVERSAL ACADEMY PRESS, INC. 1
影响因子:
--
作者:
[Shoji DOSHIDA, Masahiro CHIGIRA and Takashi Nakamura]
通讯作者:
Masahiro CHIGIRA and Takashi Nakamura
Application of airborne laser scanner to the analysis of slope development by shallow landslides in granite and granodiorite area
机载激光扫描仪在花岗岩、花岗闪长岩区浅层滑坡发育分析中的应用
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
[Shoji Doshida, Masahiro Chigira]
通讯作者:
Masahiro Chigira
Geological and geomorphological features of slope failures caused by heavy rainfall associated with Typhoon 0421 in Sei-san area, Kagawa Prefecture
香川县西山地区0421号台风强降雨引发的边坡崩塌地质地貌特征
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
[Nishiyama, K., Hirota, H., Okada, K., Chigira, M]
通讯作者:
M
共 62 条
Anatomy of first time landslides
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批准号:23310126
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项目类别:Grant-in-Aid for Scientific Research (B)
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资助金额:$4.66万
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财政年份:2011
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负责人:CHIGIRA Masahiro
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依托单位:
Study on uplift and erosion history in the Outer Belt of Southwest Japan
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批准号:23654172
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项目类别:Grant-in-Aid for Challenging Exploratory Research
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资助金额:$2.25万
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财政年份:2011
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负责人:CHIGIRA Masahiro
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依托单位:
Study on the formative processes of a weathering profile of granite and the prediction of its landslides induced by rainstorms
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批准号:15340169
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项目类别:Grant-in-Aid for Scientific Research (B)
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资助金额:$3.33万
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财政年份:2003
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负责人:CHIGIRA Masahiro
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依托单位:
Study on the generation mechanism of landslides in terms of the weathering zones of rocks
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批准号:11680469
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项目类别:Grant-in-Aid for Scientific Research (C)
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资助金额:$1.47万
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财政年份:1999
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负责人:CHIGIRA Masahiro
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依托单位:
海外基金