Future hydroclimatology of the Mekong River basin simulated using the high-resolution Japan Meteorological Agency (JMA) AGCM

Anthony S. Kiem, Hiroshi Ishidaira, Hapuarachchige P. Hapuarachchi, Maichun C. Zhou, Yukiko Hirabayashi, Kuniyoshi Takeuchi

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Analysis of future Japan Meteorological Agency atmospheric general circulation model (JMA AGCM) based climate scenarios for the Mekong River basin (MRB) indicates that annual mean precipitation will increase in the 21st century (2080-2099) by 4.2% averaged across the basin, with the majority of this increase occurring over the northern MRB (i.e. China). Annual mean temperatures are also projected to increase by approximately 2.6°C (averaged across the MRB). As expected, these changes also lead to significant changes in the hydrology of the MRB. All MRB subbasins will experience an increase in the number of wet days in the 'future' and, importantly for sustainable water resources management and the mitigation of extreme events (e.g. floods and droughts), the magnitude and frequency of what are now considered extreme events are also expected to increase resulting in increased risk of flooding, but a reduction in the likelihood of droughts/low-flow periods - assuming water extraction is kept at a sustainable level. Despite the fact that the climate change impact projections are associated with significant uncertainty, it is important to act now and put in place policies, infrastructure and mitigation strategies to protect against the increased flooding that could occur. In addition, despite this study indicating a decrease in the number of 'low-flow' days, across most of the MRB, further analysis is needed to determine whether the reduction in low-flow days is enough to compensate for (and sustain) the rapidly increasing population and development in the MRB.

Original languageEnglish
Pages (from-to)1382-1394
Number of pages13
JournalHydrological Processes
Volume22
Issue number9
DOIs
Publication statusPublished - 2008 Apr 30

Keywords

  • Daily scaling
  • Drought
  • Flood
  • Mitigation
  • Sustainable development
  • Water resources management
  • Yamanashi distributed hydrological model (YHyM)

ASJC Scopus subject areas

  • Water Science and Technology

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