New Approach for the Extraction Method of Landslide-Prone Slopes Using Geomorphological Analysis: Feasibility Study in the Shikoku Mountains, Japan
Go Sato*1,, Takatsugu Ozaki*2, Osamu Yokoyama*3, Akihiko Wakai*2, Kazunori Hayashi*4, Takanari Yamasaki*1, Shinichi Tosa*3, Takayuki Mayumi*5, and Takashi Kimura*6
*1Graduate School of Environmental Informations, Teikyo Heisei University
4-21-2 Nakano, Nakano-ku, Tokyo 164-8530, Japan
*2Graduate School of Science and Technology, Gunma University, Gunma, Japan
*3Japan Conservation Engineers & Co., Ltd., Osaka, Japan
*4Okuyama Boring Co., Ltd., Miyagi, Japan
*5Japan Conservation Engineers & Co., Ltd., Tokyo, Japan
*6Graduate School of Agriculture, Ehime University, Ehime, Japan
In recent years, airborne laser scanning has been used for terrain surveys of broad areas in Japan. This study attempted to extract the landslide-prone slope based on geomorphological and slope stability analyses using Digital Elevation Model obtained by airborne laser scanning. The study site is located in the mountainous region of the Shikoku Mountains, where landslides occur on the gentle slope deformed by mass rock creeps. Implementing slope stability analysis to incorporate “potential to increase pore water pressure” found that landslides occur in areas with low factor of safety. In the future, it is expected that the method developed in this study could contribute to the planning of basin-based disaster management.
-  O. Hungr, S. Leroueil, and L. Picarelli, “The Varnes classification of landslide types, an update,” Landslides, Vol.11, pp. 167-194, doi: 10.1007/s10346-013-0436-y, 2013.
-  K. Sasahara, H. Kato, T. Sakurai, T. Ishizuka, and A. Kaji, “Large-scale landslides occurred at eastern part of Kochi Pref. due to Typhoon No.6, 2011,” J. of the Japan Society of Erosion Control Engineering, Vol.64, No.4, pp. 39-45, doi: 10.11475/sabo.64.4_39, 2011 (in Japanese).
-  K. Sasahara, “Distribution of deep-seated landslides and gentle slopes on the ridge at Hiranabe, Kitagawa, Kochi,” J. of the Japan Society of Erosion Control Engineering, Vol.69, No.3, pp. 26-37, doi: 10.11475/sabo.69.3_26, 2016 (in Japanese).
-  G. Sato and Y. Kariya, “Mapping of ‘Landslide Geomorphological Map of the Northern Hida Mountains (1:25,000)’ and explanation of landslide topographies,” J. of the Japan Cartographers Association, Vol.52, No.1, pp. 1-12, doi: 10.11212/jjca.52.1_1, 2014 (in Japanese).
-  S. Doshida, “Relationship between landslide distribution and geological units,” J. of the Japan Landslide Society, Vol.52, No.6, pp. 271-281, doi: 10.3313/jls.52.271, 2015 (in Japanese).
-  H. Maemoku, “Quaternary crustal movement and coseismic uplift along Muroto Peninsula,” The J. of the Geological Societyof Japan, Vol.112, Issue Supplement, pp. S17-S26, doi: 10.5575/geosoc.112.S17, 2006 (in Japanese).
-  A. Taira, J. Katto, M. Tashiro, M. Okamura, and K. Kodama, “The Shimanto belt in Shikoku, Japan – Evolution of Cretaceous to Miocene accretionary prism –,” Modern Geology, Vol.12, pp. 5-46, 1988.
-  Geographical Survey Institute, “Re-survey of the south-western part of Japan after the great Nankaido earthquake of 1946,” Bulletin of the Geographical Survey Institute, Vol.3, pp. 31-118, 1952 (in Japanese).
-  M. Chigira, “Long-term gravitational deformation of rocks bymass rock creep,” Engineering Geology, Vol.32, No.3, pp. 157-184, 1992.
-  O. Yokoyama, “Evolution of uphill-facing scarps by flexural toppling of slate with high-angle faults,” Geomorphology, Vol.352, doi: 10.1016/j.geomorph.2019.106977, 2020.
-  H. Machida, “Rapid erosional development of mountain slope sand valleys caused by large landslides in Japan,” Geographical Reports of Tokyo Metropolitan University, Vol.1, pp. 55-78, 1966.
-  G. Sato, H. Yagi, H. Kitani, Y. Senda, and K. Hirota, “Remains of the Iwasa checkpoint on the Noneyama-kaido as an ancient road located in ridge-top area formed by gravitational deformation, the Muroto Peninsula, Japan,” J. of the Japan Landslide Society, Vol.57, No.1, pp. 19-23, doi: 10.3313/jls.57.19, 2020 (in Japanese).
-  Ports and Harbours Bureau of the Transport Ministry, “Handbook on Liquefaction Remediation of Reclaimed Land,” Coastal Development Institute of Technology, 285pp., 1993 (in Japanese).