PRECISION EVALUATION OF X-BAND MP RADAR RAINFALL IN A SMALL URBAN WATERSHED BY COMPARISON TO 1-MINUTE GROUND OBSERVATION RAINFALL DATA

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  • 1分値地上観測雨量データを用いた都市中小河川流域におけるXバンドMPレーダ雨量の精度評価
  • 1プンチ チジョウ カンソク ウリョウ データ オ モチイタ トシ チュウショウ カセン リュウイキ ニ オケル Xバンド MP レーダ ウリョウ ノ セイド ヒョウカ

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 Under the frequent floods caused by localized concentrated heavy rainfall, it becomes considerably important to achieve detailed rainfall, especially localized concentrated heavy rainfall in a small urban watershed. X-band MP-radar, providing space-time distribution rainfall data, is expected to be made effective use of its advanced detailed data, while few studies on the precision evaluation of 1-minute X-band MP radar data were conducted. This paper discusses results on the precision evaluation of X-band MP radar data by comparison to 1-minte ground observation rainfall data, installed in high density at the upper basin of Kanda river in Tokyo. The results showed that 1-minute data of X-band MP radar realized detailed space and time scale rainfall distribution, though it was hardly met by 10-minutes data, and sufficiently described localized concentrated heavy rainfall in a small urban watershed.

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