A Study On Applicability Of Flood Risk Maps For Flood Risk Assessment

Regarding existing qualitative evaluations for flood risks, the researcher is to use the food risk map made by the flood risk map made by applying extreme rainfall to national, local, and small rivers. The submerged range is the same regardless of rainfall intensity. Therefore, this study prepares a flood risk map by frequency and conducted IBA (Indicator-Based Approach) flood risk assessment from 2016 to 2020 for metropolitan cities. In addition, by calculating climate change through the future flood risk index, the researcher will analyze this trend with the Mann-Kendall method. This study individually prepares a flood risk map according to rainfall intensity by calculating the design flood discharge by frequency. In this case, not only hazard but also changes in the exposure and vulnerability indexes as the area of the flood risk map changes. In the case of exposure and vulnerability, extracted and calculated flood risk map includes the population and the number of buildings, so the index of the relevant items changes according to the area of the flood risk map. This study conducts a future flood risk assessment using the climate change scenario when flood risks for future metropolitan cities can be analyzed and used to cope with environmental changes. In addition, if there is a trend towards increasing at specific rainfall observatories around metropolitan cities through trend analysis, it can be shown as evidence that the probability of rainfall by future frequency is extensively estimated given these characteristics. Using these results, a local government can make a plan to manage flood risks.