A STUDY OF CHARACTERISTICS OF SHORT-TERM RAINFALLS IN SMALL URBAN RIVER BASINS

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  • Tanioka Yasushi
    社団法人 土木学会 パシフィックコンサルタンツ (株) 水工部
  • Fukuoka Shoji
    社団法人 土木学会 広島大学 工学部第四類 建設系
  • Ito Shigeyuki
    社団法人 土木学会 (株) クリアス 設計課
  • Koyama Yukiya
    社団法人 土木学会 東京都 建設局 河川部 計画課
  • Fu Yunfei
    社団法人 土木学会 パシフィックコンサルタンツ (株) 水工部

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Other Title
  • 都市中小河川流域規模を対象とした短時間雨量の特性
  • トシ チュウショウ カセン リュウイキ キボ オ タイショウ ト シタ タンジ

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Abstract

For adequate river management, flood fighting and flood control in urban small river basins, it is important to understand the characteristics of short time rainfalls in small catchments, including rainfall's migration, their rise and declime, as well as the time-space distribution. Concentrated shorttime thunderstorms and widespread longtime rainfalls of typhoons are the main cause of flooding in urban small river basins. In this study, the characteristics of short time, 5-30 minutes rainfalls within 23 square km area of thunderstorms and typhoons are studied based on the densely-observed data from the gauging station network in Tokyo. The possibility of short-term rainfall prediction is considered from the analysis of these characteristics.

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