Studies on Southeast Asian rivers under environmental changes in rainy and dry seasons

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  • Nagumo Naoko
    International Centre for Water Hazard and Risk Management, Public Works Research Institute

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  • 雨季・乾季の環境変動を伴う東南アジアの河川研究
  • ウキ ・ カンキ ノ カンキョウ ヘンドウ オ トモナウ トウナン アジア ノ カセン ケンキュウ

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<p>Sediment transport and landform development caused by Southeast Asian rivers undergo dramatic seasonal changes due to distinct monsoon and dry climate conditions. Though their spatiotemporal scale is several orders smaller, the changes are similar to the river response to long-term basal level changes during the Quaternary Period, offering many suggestions to characterize river behavior. However, only limited numbers of studies have been conducted on this matter. In addition, it is important for flood damage mitigation in areas along the rivers to understand seasonally sensitive characteristics of fluvial plains in terms of sediment transport processes. In this context, introducing research conducted in Cambodia and the Philippines, this paper discusses the importance of scientifically interpreting phenomena in land areas, such as floods, fluvial sediment transport, and historical development of fluvial plains, from the Quaternary viewpoint, and of understanding diverse human involvements in the dynamic water environment in order to contribute to constructing safe and stable communities.</p>

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