JDR Vol.11 No.6 pp. 1128-1136
doi: 10.20965/jdr.2016.p1128


Rapid Global Exposure Assessment for Extreme River Flood Risk Under Climate Change

Youngjoo Kwak and Yoichi Iwami

International Center for Water Hazard and Risk Management (ICHARM), Public Works Research Institute (PWRI)
1-6 Minamihara, Tsukuba, Ibaraki 305-8516, Japan

Corresponding author,

June 14, 2016
August 21, 2016
December 1, 2016
global river flood, risk assessment, flood inundation depth, extreme flood, climate change

Globally, large-scale floods are one of the most serious disasters, considering increased frequency and intensity of heavy rainfall. This is not only a domestic problem but also an international water issue related to transboundary rivers in terms of global river flood risk assessment. The purpose of this study is to propose a rapid flood hazard model as a methodological possibility to be used on a global scale, which uses flood inundation depth and works reasonably despite low data availability. The method is designed to effectively simplify complexities involving hydrological and topographical variables in a flood risk-prone area when applied in an integrated global flood risk assessment framework. The model was used to evaluate flood hazard and exposure through pixel-based comparison in the case of extreme flood events caused by an annual maximum daily river discharge of 1/50 probability of occurrence under the condition of climate change between two periods, Present (daily data from 1980 to 2004) and Future (daily data from 2075 to 2099). As preliminary results, the maximum potential extent of inundation area and the maximum number of affected people show an upward trend in Present and Future.

Cite this article as:
Y. Kwak and Y. Iwami, “Rapid Global Exposure Assessment for Extreme River Flood Risk Under Climate Change,” J. Disaster Res., Vol.11, No.6, pp. 1128-1136, 2016.
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