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Integrated flood risk analysis in a changing climate : A case study from the Korean Han River basin

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Title Integrated flood risk analysis in a changing climate
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Sub Title

A case study from the Korean Han River basin

Material Type Reports
Author(English)

Yoon, Sun Kwon; Kim, Jong Suk; Moon, Young Il

Publisher

2014 Korean Society of Civil Engineers

Date 2014
Journal Title; Vol./Issue KSCE Journal of Civil Engineering:vol. 18(no. 5)
Pages 9
Subject Country South Korea(Asia and Pacific)
File Type Documents
Original Format pdf
Subject Territorial Development < Environment
Holding APEC Climate Center

Abstract

This research performed a case study to develop an integrated Flood Risk Index (FRI) considering hydrologic, socio-economic, and ecological components to assess watershed-based flood hazards and vulnerability in the Korean Han River Basin, where flood disasters frequently occur. We used fifteen indicators, which were standardized, weighted, and classified, to create an FRI map. Five categories of flood risk were distinguished: “very high”, “high”, “medium”, “low”, and “very low”. The results in ternary diagrams, illustrating the relative importance of the three components show that urban areas in the Korean Han River Basin have experienced a decrease of 1.0% in terms of the hydrologic component. However, the socio-economic and ecological components have increased by 3.2% and 4.4%, respectively. In rural areas, an increase of 4.8% was found in the hydrologic component alongside decreases in the socio-economic (1.6%) and ecological (2.2%) factors. In addition, the FRI map shows that 20.02% of the total area of the Han River Basin is classified as having “very high” or “high” flood risk; the size of this high-risk zone has increased significantly, by 7.12, since 1990. Despite the relatively small sample size and lack of data, the results presented here provide a quantified assessment of Han River flood risk combined with an integrated view of risk assessment and management for stakeholders and decision-makers.