The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume XLI-B8
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B8, 125–132, 2016
https://doi.org/10.5194/isprs-archives-XLI-B8-125-2016
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B8, 125–132, 2016
https://doi.org/10.5194/isprs-archives-XLI-B8-125-2016

  22 Jun 2016

22 Jun 2016

ANALYSIS OF DEBRIS FLOW DISASTER DUE TO HEAVY RAIN BY X-BAND MP RADAR DATA

M. Nishio1 and M. Mori2 M. Nishio and M. Mori
  • 1Graduate School of Humanity-Oriented Science and Engineering, Kinki University, 8208555 Iizuka City, Fukuoka, Japan
  • 2Dept. of Information Science, School of Humanity-Oriented Science and Engineering, Kinki University, 8208555 Iizuka City, Fukuoka, Japan

Keywords: M X-band MP radar, GIS, Disaster prevention, Web-based

Abstract. On August 20 of 2014, Hiroshima City (Japan) was struck by local heavy rain from an autumnal rain front. The resultant debris flow disaster claimed 75 victims and destroyed many buildings. From 1:30 am to 4:30 am on August 20, the accumulated rainfall in Hiroshima City exceeded 200 mm. Serious damage occurred in the Asakita and Asaminami wards of Hiroshima City. As a disaster prevention measure, local heavy rain (localized torrential rains) is usually observed by the Automated Meteorological Data Acquisition System (AMeDAS) operated by the Japan Meteorological Agency (JMA) and by the C-band radar operated by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) of Japan, with spatial resolutions of 2.5 km and 1 km, respectively. The new X-band MP radar system enables more detailed rainfall observations than the C-band radar. In fact, this radar can observe local rainfall throughout Japan in near-real time over a minimum mesh size of 250 m. A fine-scale accumulated rainfall monitoring system is crucial for disaster prevention, and potential disasters can be alerted by the hazard levels of the accumulated rainfall.