DEVELOPMENT OF FLOOD EARLY WARNING METHODOLOGIES USING RATIONAL FORMULA MODEL IN MOUNTAINOUS RIVERS

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  • KIKUMORI Yoshito
    土木研究所 水災害・リスクマネジメント国際センター
  • IKEUCHI Koji
    東京大学 大学院工学系研究科 社会基盤学専攻 教授
  • EGASHIRA Shinji
    土木研究所 水災害・リスクマネジメント国際センター
  • ITO Hiroyuki
    土木研究所 水災害・リスクマネジメント国際センター

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Other Title
  • 中山間地河川における合理式モデルを用いた洪水予警報手法の開発

Abstract

<p> In recent years, flood disasters of unprecedented scale have frequently occurred in mountainous rivers in various parts of Japan, and necessary measures, such as introduction of warning and evacuation systems, need to be taken urgently. Among them, flood early warning systems (FEWS) are considered to be one of the effective measures to mitigate the impact of flood disasters. For FEWS to operate effectively, two capabilities are crucial: they should be able to predict the water levels of river channels as early as possible so as to ensure sufficient time for evacuation, and they should also be able to be easily installed even in locations without sufficient data on past floods. In this study, employing a flood early warning system using a rational formula with standard parameters, which is used for river channel design without parameter identification, we conducted simulations for two recent cases of large-scale floods in different mountainous rivers to examine the effectiveness of the flood early warning system in terms of the length of the lead time (the time between when a sign of a disaster is detected and when the disaster actually occurs).</p>

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