Author(s): Gyumin Lee, Jinwon Choi, Kyung Soo Jun
Linked Author(s): Gyu LEE
Keywords: Urban flood vulnerability, Delphi, MCDM, TOPSIS
Abstract: This study provides an approach for assessing flood vulnerability at the urban catchment scale. Influencing factors for urban flood vulnerability assessment include urban structure, buildings, and critical objects. The procedure for the urban flood vulnerability assessment is divided into four stages in this research. In the first stage, the influencing factors are selected and weight values are calculated, which are applied to the flood vulnerability assessment. In the second stage, the input data for the selected assessment factors are collected and standardized according to the measurement units and categories of data. For the third stage, the spatial information of the region for the assessment is established using ArcGIS, based on the standardized data. Lastly, the vulnerability is assessed using the Multi-criteria Decision Making (MCDM) methods as TOPSIS, and the priority control regions in the vulnerable area are determined. The approach is applied to the Dorimcheon basin in Seoul, South Korea. Data are collected from the object regions according to the selected assessment index, and organized spatially. Since the collected data have different spatial distributions and units, 0. 1 � 0. 1 km grids are set up to assess the vulnerability, and the applicable values are recalculated in each grid depending on the index. All weights on criteria are derived from an objective procedure. This study uses Delphi technique to select all criteria and quantify all weights. The assessment results provide information on the regions that are relatively more vulnerable to urban floods in the object area, and can be used as useful data to select the priority control region when floods occur in the area
Year: 2017