Japan Geoscience Union Meeting 2021

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[J] Oral

H (Human Geosciences ) » H-DS Disaster geosciences

[H-DS10] Geohazards in humid, tectonically active countries and their precursors

Sat. Jun 5, 2021 1:45 PM - 3:15 PM Ch.16 (Zoom Room 16)

convener:Satoru Kojima(Department of Civil Engineering, Gifu University), Taro Uchida(University of Tsukuba), Yoshihiko Kariya(Department of Environmental Geography, Senshu University), Chairperson:Yoshihiko Kariya(Department of Environmental Geography, Senshu University), Satoru Kojima(Department of Civil Engineering, Gifu University)

3:00 PM - 3:15 PM

[HDS10-06] Creating a Landslide risk map of the Nachi River basin

*Makoto Msatsuzawa1, Tatsuya Ito1, Chiyoshi Minami1, Atsuhiko Kinoshita2, Suguru Shibata2, Taku Yamada3, Toshiaki Kotake3, Yasutaka Tanaka4 (1.PACIFIC CONSULTANTS CO., LTD., 2. Sediment Disaster Prevention Technology Center, 3.Kiisankei sabo office, 4.HOKKAIDO UNIVERSITY)

Keywords:Landslide risk map, Shallow Landslide, Degree of Mountain Denudation, Granodiorite, Mudstone, Geologic Boundary

Due to the 2011 Kii Peninsula flood, Landslides occurred frequently in the Nachi River basin in Wakayama Prefecture, and the debris flow that accompanied it caused 28 deaths, missing persons, and many casualties. Most of the slope failures were Shallow Landslides. In the Nachi River basin, private houses are concentrated along the Nachi River, and it has been reported that debris flows caused by Landslides have caused casualties in the past during heavy rains. Therefore, in this study, we attempted to create a Landslide risk map based on the relationship between the topographical and geological classification and the Landslide area ratio in 2011.