EXTRACTION OF OCCURRENCE AND NON-OCCURRENCE RULES OF DEBRIS FLOW BY HEAVY RAINFALL IN NAGASAKI IN JULY, 1982

Abstract

  We set an occurrence and non-occurrence rule of debris flow disaster in Nagasaki on July 23, 1982, based on comparison analyses among the collected data of it. The analytical method was proposed by Shinozaki et al., combining Support Vector Machine with Rough Set Theory. The rule made it possible to explain more cases of occurrence and non-occurrence debris flow disaster in torrents compared to the case of using only the Rough Set Theory. As these results, we assumed that the analytical method proposed by Shinozaki et al. achieved a high efficiency to extract rule with high versatility, maintaining sufficient accuracy in case study analyses of occurrence and non-occurrence of the disaster.