2016 Fiscal Year Research-status Report
A new method by exploring responses of mountain slopes to river incision for predicting potential landslide sites for hazard mitigation: A case of Shirakami-Sanchi, Japan
| Project/Area Number |
16K20893
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| Research Institution | Hirosaki University |
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Principal Investigator |
鄒 青穎 弘前大学, 農学生命科学部, 助教 (40750055)
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Keywords | landslide / river incision |
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| Outline of Annual Research Achievements |
In FY 2016, distribution of unstable slopes has been observed by using a 1-m mesh LiDAR-derived DEM that covered the most part of the Shirakami-Sanchi. I noted that microtopography is an important indicator to identify the unstable slope. Besides, field survey was conducted in the Okawa River and the Juniko area. Observation in the Okawa River indicates that the slip surfaces of some landslides have been exposed along the river. In such a case, landslides tend to be move in association with river incision. Whereas observation in the Juniko area shows that many linear depressions are distributed in the upper slope of the landslide. This would indicate the landslide was preceded by slope deformation.
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| Current Status of Research Progress |
Current Status of Research Progress
4: Progress in research has been delayed.
Reason
In FY 2016, I was planned to conduct topographic analysis of hillslopes and rivers and to map distribution of slope failures. The required data for these analyses are collected. Methods for these works are tested and facilitated. However, studies were mainly conducted to identify the various types of microtopography and in some case they need to be checked in the field. The remaining works will be further preceded in FY 2017.
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| Strategy for Future Research Activity |
River profile analysis and mapping of slope failures will be further preceded in FY 2017. Relationships among topographic and geological characteristics, existing slope instability and potential slope failure will be quantify to identify potential landslide sites in the context of landscape evolution.
The results are planned to be presented in the 2018 European Geoscience Science.
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| Causes of Carryover |
I was planned to purchase satellite imagery and the LiDAR DEM for the study. However, aerial photos, which could be made with higher resolution than the satellite imagery, are provided by the Shirakami Institute for Environmental Sciences, Hirosaki University. The LiDAR DEM of the interested areas are also provided by the Ministry of Land, Infrastructure, Transportation and Tourism, Japan.
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| Expenditure Plan for Carryover Budget |
Survey equipment for monitoring the movement of the interested slopes (i.e. slopes of the Okawa River and Juniko area) are required. They are considered to be purchased. To board the knowledge regarding the topics of this study, I am also planning to attend conferences of JpGU and Slope tectonics and present the related results.
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Research Products
(1 results)
