Recognition, opinion and evaluation of sabo by the residents around debris flow disaster stricken area in Miyake Island

Hiroshi MAKINO, Naoki NISHIMURA, Masaaki MANTOKU, Yoshiharu ISHIKAWA and Haruo NISHIMOTO

The main volcano on Miyake Island, one of the Izu Islands, erupted in 2000, and all islanders evacuated because of the subsequent debris flows and volcanic gas. Various actions had been taken including the construction of sabo dams to cope with debris flows. Under these circumstances, a questionnaire survey was conducted twice, in 2012 and 2014, to find out what the residents around its disaster stricken area think about the sabo, or sediment control, and how they rate it. During the two surveys, a debris flow disaster occurred on Izu Oshima Island in October 2013. In analyzing its result, the relation between recognition and opinions are currently used. However, the survey shows it is efficient to add evaluation to them in analyzing. It is considered useful for future sabo projects if the authorities can take actions based on having a good understanding of the residents' recognition, opinion and evaluation of sabo.