日本地球惑星科学連合2019年大会

講演情報

[E] ポスター発表

セッション記号 H (地球人間圏科学) » H-TT 計測技術・研究手法

[H-TT19] Geographic Information Systems and Cartography

2019年5月30日(木) 10:45 〜 12:15 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:小口 高(東京大学空間情報科学研究センター)、村山 祐司(筑波大学大学院生命環境科学研究科地球環境科学専攻)、若林 芳樹(首都大学東京大学院都市環境科学研究科)

[HTT19-P07] Using GIS and remote sensing to assess relationships between landslides and land cover changes in the Sanbagawa and Mikabu Belts, Shikoku, Japan

*Roxanne Lai1Takashi Oguchi1 (1.University of Tokyo)

キーワード:Landslides, Shikoku, GIS , Remote Sensing

The Sanbagawa and Mikabu Belts are metamorphic belts that run across Southwest Japan, and are home to numerous large crystalline schist landslides, including the widely-studied slow but continuously moving Zentoku landslide. Villages and communities have been built on these landslide areas due to historical and cultural factors, as well as the fertility of the soil. With changing human needs and social trends, however, changing land uses is becoming an increasingly important issue. In Japan, movement of the population from rural to urban areas have resulted in much land and agricultural land abandonment. As vegetation cover changes after land abandonment, this temporal and spatial effect may have important effects on geomorphic processes such as landslide susceptibility and landslide kinematics.

Here we track long-term land cover changes over vegetated landslide areas of the Sanbagawa and Mikabu Belts of Shikoku Island, Japan, and conduct spatio-temporal analyses to assess relationships between landslides and land cover changes. Given changing land uses, including land abandonment in these landslide areas over time, we use long-term high-resolution land cover vegetation datasets to examine first the long-term land use changes, and then use statistical methods to explore their relationships with landslide susceptibility and kinematics. Mapping of spatial data and their analysis using GIS constitute a core part of the research. The results suggest interconnections between land use changes and land movement.