Spatial Analysis of the Landslide Characteristics Caused by Heavy Rainfall in the Northern Kyushu District in July, 2017 Using Topography, Geology, and Rainfall Levels
Toru Danjo, Tomohiro Ishizawa, and Takashi Kimura
Storm, Flood and Landslide Research Division, National Research Institute for Earth Science and Disaster Resilience
3-1 Tennodai, Tsukuba, Ibaraki 305-0006, Japan
The heavy rain in Northern Kyushu District on July 5, 2017 caused a sediment disaster, resulting in the loss of many lives and damage to buildings. In this study, the primary causes (topography and geology) and trigger factors (rainfall) for the sediment disaster were spatially analyzed to examine factors contributing to slope failure. As a result, it was found that the number of slope failures was highest in metamorphic rock areas and the occurrence density of the landslides was highest in plutonic rock areas. In addition, the slope angle of the slope-failure source point was sizable in volcanic rock areas and many landslides occurred in the valley-formed areas. A rainfall analysis showed that the Akatani, Shirakitani, Sozu, Kita, Naragaya, Myoken, Katsura river basins and Ono, Ohi, Sata, Inaibaru river basins are different rainfall distributions, which significantly affected the slope-failure occurrence density.
-  Japan Meteorogical Agency, http://www.data.jma.go.jp/obd/stats/data/mdrr/pre_rct/alltable/pre24h00.html#a82 [accessed June 24, 2018]
-  Fire and Disaster Management Agency, http://www.fdma.go.jp/bn/2017/detail/1007.html [accessed June 24, 2018]
-  Ministry of Education, Culture, Sports, Science and Technology, “Repot of comprehensive research concerning heavy rainfall in Northern Kyushu District on July 2017,” pp. 127-130, 2018 (in Japanese).
-  Disaster Prevention Research Institute, Kyoto University, “Report of the survey on heavy rainfall in Northern Kyushu District in 2017,” pp. 25-32, 2018 (in Japanese). http://www.dpri.kyoto-u.ac.jp/web_j/publication/other/20180330_kyusyu.pdf [June 24, 2018]
-  Geospatial Information Authority of Japan, https://fgd.gsi.go.jp/download/menu.php [accessed June 24, 2018]
-  National Institute of Advanced Industrial Science and Technology, “Seamless Digital Geological Map of Japan (1:200,000),” https://gbank.gsj.jp/seamless/index.html?lang=ja& [accessed June 24, 2018]
-  K. Nagata, “Quantitative precipitation estimation and quantitative precipitation forecasting by the Japan Meteorological Agency,” RSMC Tokyo Typhoon Center Technical Review, Vol.13, pp. 37-50, 2011.
-  T. Okimura, N. Torii, and H. Nagai, “Analysis of mountain slope failures caused by rainfalls after earthquake,” Report of Research Center for Urban Safety and Security, Vol.2, pp. 19-31, 1998 (in Japanese).
-  Geospatial Information Authority of Japan, http://www.gsi.go.jp/BOUSAI/H29hukuoka_ooita-heavyrain.html [accessed June 24, 2018]
-  PASCO Corporation, http://www.pasco.co.jp/disaster_info/20170708/ [accessed June 24, 2018]
-  P. A. Burrough and R. A. McDonnell, “Principles of geographical information systems,” Oxford University Press, p. 190, 1998.
-  I. D. Moore, R. B. Grayson, and A. R. Ladson, “Digital terrain modelling: A review of hydrological, geomorphological, and biological applications,” Hydrological Processes, Vol.5, pp. 3-30, 1991.
-  L. W. Zevenbergen and C. R. Thorne, “Quantitative analysis of land surface topography,” Earth Surface Process and Landforms, Vol.12, pp. 47-56, 1987.
-  T. Suzuki, “Introduction to map reading for civil engineers,” Kokonshoin, Vol.1, p. 122, 1997 (in Japanese).
-  Japan Meteorogical Agency, http://www.data.jma.go.jp/obd/stats/etrn/index.php [accessed June 24, 2018]
-  N. Osanai, Y. Tomita, K. Akiyama, and T. Matsushita, “Realty of cliff failure disaster,” Technical note of national institute for land and infrastructure management, No.530, p. 52, 2009 (in Japanese).
This article is published under a Creative Commons Attribution-NoDerivatives 4.0 Internationa License.