Rough Set in the Application of Flood Risk Assessment

For the randomness,complexity and uncertainty characteristics of Flood disasters,and the subjectivity exists in the process of selecting evaluation indicators of flood risk assessment,this paper presents a method to reduce the indicators set by using rough set attribute reduction algorithm that excludes attributes not affect the final outcome.This paper also constructs the flood risk assessment index system with the relative reduction technology,and applies fuzzy AHP method to assess the flooding risk of the region.The new method is more objective and effective than the way by expert scoring.