1990 Fiscal Year Final Research Report Summary
Development of a Method for Risk Evaluation and Forecast of Occurrence of a Landslide Using Satellite Remote Sensing Data
| Project/Area Number |
01850116
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Research Field |
基礎・土質工学
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| Research Institution | Nagasaki University |
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Principal Investigator |
GOTOH Keinosuke Nagasaki Univ., Faculty of Eng., Professor, 工学部, 教授 (00037954)
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| Co-Investigator(Kenkyū-buntansha) |
KAZAMA Hidehiko Saitama Univ., Faculty of Eng., Res. Associate, 工学部, 助手 (40008868)
YAMAGAMI Takuo Tokushima Univ., Faculty of Eng., Professor, 工学部, 教授 (90035642)
SETOJIMA Masahiro Kokusai Kogyo Co., Ltd., Chief Engineer, 調査解析部, 課長
TANABASHI Yoshihiko DO., Faculty of Eng., Assoc. Professor, 工学部, 助教授 (80039685)
MURATA Hidekazu Yamaguchi Univ., Faculty of Eng., Professor (80044618)
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| Project Period (FY) |
1989 – 1990
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| Keywords | Landslide / Risk Evaluation / Forecast of Occurrence / Remote Sensing / Quantification Theory / Vegetation Vigor / Field Survey / Landslide Clay |
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| Research Abstract |
In this project a method was developed for evaluating the risk of a landslide and for forecasting its occurrence using satellite remote sensing data. Risk evaluation was carried out by applying the Hayashi's quantification theory in which the items were not only geographic, geological and landuse informations but vegetation vigor, and forecast of occurrence, by investigating the temporary variation of the vegetation vigor.
The developed method is as follows : (1) To collect geographic, geological and land use informations and satellite remote sensing data for an objected area. (2) To calculate the vegetation vigor for all pixels of the area from the satellite data. (3) To evaluate the degree of landslide risk by use of the quantification theory. (4) To investigate the temporary variation of the vegetation vigor for the pixels where the degree of landslide risk is high. (5) To decide the pixels the variation of which is conspicuous as the portion where a landslide is possible to occur.
Pilot studies were dealt with the landslides which occurred at Nagano City, Nagano Prefecture in July 1985 and at Sasebo City, Nagasaki Prefecture in July 1986. Satellite remote sensing data used in the studies were Multispectral Scanner (MSS) data of LANDSAT acquired before the landslides. As a result, the pixels where the degree of landslide risk was calculated to be high by the risk evaluation coincided with the portion where the landslide occurred actually, and at this portion the vegetation vigor was found to vary remarkably. This result clarifies the developed method is effective to forecast the occurrence of a landslide.
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