다기준의사결정기법을 이용한 도시 중소유역 홍수위험도 평가

This study has performed the relative flood risk assessment in the urban small watershed using entropy method and PROMETHEE (Preference Ranking Organizing METHod for Enrichment Evaluations) which is one of the multi criteria decision making method. The evaluation criteria are classified into three categories according to the rainfall and runoff characteristic and regional characteristic. Those are flood warning rainfall, rising curve gradient, flood magnitude ratio, flood duration time, flood contribution rate per unit area, impervious cover rate. Suyeong basin is separated to 20 subbasins and the suggested method is applied to verify its applicability. Out of twenty subbasins, six, fourteen and six basins are evaluated as high risk, medium risk and low risk. The flood occurred in one of high risk subbasins in the past and it is found that the method of this study is higher applicability.