Abstract
On July 19, 2006, several sediment-related disasters (debris flows and landslides) occurred in Okaya and Suwa, Nagano Prefecture, Japan. In Okaya, neither the municipal government nor the residents had expected such a disaster, and they were unprepared. No evacuation of the population took place prior to the disaster, and two debris flows killed eight people. Another debris flow struck a retirement home. Fortunately, the first-floor residents could be evacuated to the second floor. In contrast, the nearby town of Suwa was evacuated voluntarily before the debris flow struck, and no fatalities occurred. This paper describes the situation at the time of the disaster, the evacuations in Okaya and in Suwa, and their consequences from the point of view of disaster-prevention personnel and retirement-home staff. Factors that should be considered in formulating warning and evacuation systems in response to sediment-related disasters are discussed.
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References
Chubu Regional Development Bureau (CRDB) of the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) in Japan and Nagano Prefecture (2006) Flood situation of flood disasters at the Tenryu River in Nagano Prefecture. http://www.cbr.mlit.go.jp/kawatomizu/08/pdf/2006072102_tenryu.pdf. Accessed 2 June 2009
Hiramathu S et al (2006) Sediment-related disasters occurring by heavy rainfall in July 2006. J Jpn Soc Eros Control Eng 266:51–56
MLIT (2007) Exploratory Committee on Sediment-related Disaster Warning and Evacuation Guidelines, Ministry of Land, Infrastructure, Transport and Tourism in Japan web page, http://www.mlit.go.jp/river/sabo/dosya-guidelines/s1.pdf, Accessed 23 June 2009
Nagano Prefecture (2007) Proposal by the Advisory Committee in response to debris flow caused by heavy rainfall in July 2006. http://www.pref.nagano.jp/doboku/sabo/kaigi/dosyaken/teigen190319.pdf. Accessed 2 June 2009
Nagano Prefecture (2009) Nagano Prefecture web page. http://www.pref.nagano.jp/index.htm. Accessed 23 Apr 2009
Nakaya H (2004) Cost–Loss structure of evacuation activities by local municipalities in severe weather. J Jpn Soc Eros Control Eng 252:13–19
Nojima H et al (2009) Preparing hazard maps with a focus on residents. The 57th Preventing Sand Erosion Society Research Symposium outline collection
Sabo Department of the Ministry of Land, Infrastructure, Transport, and Tourism (MLIT) (2007) Sediment-related Disaster Warning and Evacuation Guidelines. (in English: http://www.sabo-int.org/guideline/pdf/sediment_02.pdf)
Terada H (2006) The situation of debris flow disasters occurring in Okaya. Civil Eng J Jpn, 48–50
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Chiba, M. Warning and evacuation in response to sediment-related disasters. Nat Hazards 56, 499–507 (2011). https://doi.org/10.1007/s11069-009-9435-7
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DOI: https://doi.org/10.1007/s11069-009-9435-7