Japan Geoscience Union Meeting 2015

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International Session (Oral)

Symbol H (Human Geosciences) » H-TT Technology & Techniques

[H-TT09] GIS

Mon. May 25, 2015 9:00 AM - 10:45 AM 101A (1F)

Convener:*Takashi Oguchi(Center for Spatial Information Science, The University of Tokyo), Yuji Murayama(Graduate School of Life and Environmental Sciences), Ryosuke Shibasaki(Center for Spatial Information Science, the University of Tokyo), Shin Yoshikawa(Faculty of Engineering, Osaka Institute of Technology), Chair:Yuji Murayama(Graduate School of Life and Environmental Sciences), Takashi Oguchi(Center for Spatial Information Science, The University of Tokyo)

9:30 AM - 9:45 AM

★ [HTT09-03] Analysis of the landslides in Hiroshima caused by the typhoon-12 based on bivariate statistical landslide susceptibility

*Jie DOU1, Uttam Paudel1, Takashi Oguchi2, Yuichi S. Hayakawa2 (1.Department of Natural Environmental Studies, The University of Tokyo, 2.Center for Spatial Information Science, The University of Tokyo)

Following the heavy rainfall caused by the typhoon-12 on 20th August 2014, Hiroshima city in Japan was struck by a series of landslides including numerous mudslides and debris flows. The landslides affected several suburban residential areas mostly in the Asaminami and Asakita wards causing a great loss of property and the death of 74 residents. This study concerns a bivariate statistical approach to analyse if a landslide susceptibility study would have been able to identify the vulnerable areas beforehand. Firstly, we prepared a landslide susceptibility map (LSM) using a 10 m DEM, geological information and past occurrences of landslides. The landslides after the typhoon event were later used to access the accuracy of the LSM. The inventory of landslides before and after the typhoon event was interpreted from the high-resolution satellite images. The results show that a similar landslide susceptibility study could have identified vulnerable areas and helped in mitigating the disaster.