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Open AccessArticle

RCP8.5-Based Future Flood Hazard Analysis for the Lower Mekong River Basin

United Nations University–Institute forWater, Environment and Health, Hamilton, ON L8P 0A1, Canada
Disaster Prevention Research Institute, Kyoto University, Kyoto 611-0011, Japan
International Research Centre for River Basin Environment, University of Yamanashi, Kofu 400-8511, Japan
International Centre for Water Hazard and Risk Management, Public Works Research Institute, Tsukuba, Ibaraki 302-8516, Japan
Nagasaki Prefectural Civil Engineering Department, Nagasaki 850-8570, Japan
Author to whom correspondence should be addressed.
Hydrology 2017, 4(4), 55;
Received: 13 September 2017 / Revised: 17 November 2017 / Accepted: 21 November 2017 / Published: 23 November 2017
(This article belongs to the Special Issue Advances in Large Scale Flood Monitoring and Detection)
Climatic variations caused by the excessive emission of greenhouse gases are likely to change the patterns of precipitation, runoff processes, and water storage of river basins. Various studies have been conducted based on precipitation outputs of the global scale climatic models under different emission scenarios. However, there is a limitation in regional- and local-scale hydrological analysis on extreme floods with the combined application of high-resolution atmospheric general circulation models’ (AGCM) outputs and physically-based hydrological models (PBHM). This study has taken an effort to overcome that limitation in hydrological analysis. The present and future precipitation, river runoff, and inundation distributions for the Lower Mekong Basin (LMB) were analyzed to understand hydrological changes in the LMB under the RCP8.5 scenario. The downstream area beyond the Kratie gauging station, located in the Cambodia and Vietnam flood plains was considered as the LMB in this study. The bias-corrected precipitation outputs of the Japan Meteorological Research Institute atmospheric general circulation model (MRI-AGCM3.2S) with 20 km horizontal resolution were utilized as the precipitation inputs for basin-scale hydrological simulations. The present climate (1979–2003) was represented by the AMIP-type simulations while the future (2075–2099) climatic conditions were obtained based on the RCP8.5 greenhouse gas scenario. The entire hydrological system of the Mekong basin was modelled by the block-wise TOPMODEL (BTOP) hydrological model with 20 km resolution, while the LMB area was modelled by the rainfall-runoff-inundation (RRI) model with 2 km resolution, specifically to analyze floods under the aforementioned climatic conditions. The comparison of present and future river runoffs, inundation distributions and inundation volume changes were the outcomes of the study, which can be supportive information for the LMB flood management, water policy, and water resources development. View Full-Text
Keywords: climate change; flood hazards; high-resolution AGCM; inundation analysis; Lower Mekong river basin climate change; flood hazards; high-resolution AGCM; inundation analysis; Lower Mekong river basin
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Perera, E.D.P.; Sayama, T.; Magome, J.; Hasegawa, A.; Iwami, Y. RCP8.5-Based Future Flood Hazard Analysis for the Lower Mekong River Basin. Hydrology 2017, 4, 55.

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