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As climate change and population transition in Japan are modifying country-side slope dynamics (in mountains and volcanoes), new challenges for disaster risk mitigation arise. The goal is to reduce effects and casualties as much as possible.

砂防としゃめん

Mountain slope processes

Climate change, demographic transition and slope movements in Japan, Indonesia and NZ

火山地区浸食と土砂災害

Volcanic slope erosion and hazards

Slope processes and erosion on volcanoes and slopes influenced by volcanic activity.

方法

Tools ＆ Methods

High-resolution topography, subsurface geophysical imaging and geotechnical testing and simulation.

論文・本

Publications

Books, book chapters, peer-reviewed publications and other presented and published material.

学生向け

山に起きるフィールド調査は右のビデオのようになる。今回紹介してる現場は北海道厚真町です。２０１８年に地震が起きた場所です。このビデオで使われてる３次元点群データを作るためにドローンと地盤調査が行われたです。

Research Objectives

To save lives and reduce the impacts of slope-born sediment hazards

When I began my career, I was happy to record 1 to a few tens of points using RTK and PPK GPS and GNSS. But a few points are not sufficient to provide a complete view of the erosion and deformation of slopes. Thus, I have worked on photogrammetric and LiDAR methods from multiple flying and ground-platforms, in order to improve our monitoring capabilities.

... but what we can see from slope HRT monitoring often left us wondering what occurs underneath the surface. To image the structure and properties of the subsurface, I have been using GPR (Ground Penetrating Radar) for 20 years.

... once we have a HRT dataset of the slope over time, and that we have the subsurface data (from GPR and others), it is then essential to link those field dataset to theory and to provide robust explanation. For this purpose, my laboratory uses soil mechanics tools and paradigms...

... using these three main methods (HRT LiDAR and Photogrammetry + GPR + Soil Mechanics), I am particularly interested in understanding the effects of climate change on slope systems as the water cycle is changing in volume and intensity, and as it impacts vegetation on slopes as well...

... finally as Japan is facing the challenge of rural population depletion, it is also important to measure and simulate the effects of this process on "once used" slopes and also on how those slopes may trigger new hazards.

土砂・砂防・防災・災害