The proposal on risk evaluation method for sediment disasters with rough sets

Takeharu SATO and Natsuki SAWA

Occurrence of sediment disasters is concerned with plural predispositions. Although a lot of topographical features are arranged by field survey, it is difficult to find which combination of predispositions is concerned with occurrence of sediment disasters. Rough set is used as one way to solve this problem. Rough set presents the predisposition and rules that affect the landslides. However, there has been a problem in which a lot of the rules are extracted. In this study, using the concept of rules defined by rough set, propose a method of evaluating the risk of sediment disasters. We have shown how to evaluate quantitatively by adding the number of rules that are the conventional problems.