Development of Flood Vulnerability Assessment Method considering Urban Characteristics: Daegu Metropolitan City

Abstract

This study intends to develop a flood vulnerability assessment method and flood damage reduction measures in urban areas for Daegu Metropolitan City. The proxy variables for the flood vulnerability assessment were calculated using the previously investigated proxy variables for urban areas. The Flood Vulnerability Index (FVI) of the urban area was proposed using the Regional Significance Index (RSI), which indicates the importance of each region, and the Damage Possibility Index (DPI) for flood damage data. The RSI selected four proxy variables: population density, vulnerable population ratio, property density, and area ratio of major facilities. The DPI also selected four proxy variables: area ratio of low land, the impervious area ratio, status of domestic disaster risk district, and flood occurrence record. Eight proxy variables were selected and the FVI of urban areas calculated using multiplicative utility functions. As a result of the calculation, the FVI of Daegu Metropolitan City was found to be high in the central urban areas and by the streams. The results of this study are expected to be used for flood vulnerability assessments in urban areas and establishing flood damage reduction measures.