This study is conducted as part of the study on estimation of the peak discharge of "the Yokota-Gire Flood" in July 1896, one of the historical floods in the Shinano River Basin. This study analyses relationship between rainfalls and discharges of relatively large floods since 1956 with well recorded rainfalls and flood discharges, and particularly compares the Yokota-Gire Flood with the flood in September 1982, in which the similar amount of rainfall was recorded despite the difference of the number of precipitation stations exists. Making clear the characteristics of hourly and spatial distribution of the rainfalls which caused large floods in the Shinano River Basin, not only helped to improve the accuracy of the peak discharge estimation of the Yokota-Gire Flood and to verify its validity, but also clarified the statistical positioning of the Yokota-Gire Flood through rainfall characteristics. Key Word: historic flood, rainfall and discharge, hourly and spatial distribution of rainfall, estimation of peak discharge
1 非会員 国土交通省 北陸地方整備局 黒部河川事務所長(〒938-0042 富山県黒部市天神新173) 2 非会員 国土交通省 北陸地方整備局 黒部河川事務所 建設専門官(同上) 3 非会員 国土交通省 北陸地方整備局 黒部河川事務所 調査・品質確保課 専門員 (同上) 4 正会員 日本工営株式会社 中央研究所 総合技術開発部 部長代理(〒300-1259 茨城県つくば市稲荷原2304) 5 正会員 日本工営株式会社 流域・防災事業部 河川・水工部 部長(〒102-0083 東京都千代田区麹町4丁目2番地) 6 非会員 日本工営株式会社 流域・防災事業部 地盤環境部 課長補佐(同上) 7 非会員 日本工営株式会社 中央研究所 総合技術開発部 研究員(〒300-1259 茨城県つくば市稲荷原2304)Significant seepage from rivers into groundwater sometimes causes difficulties in river flow management particularly in the sense of water environment and its conservation. Kurobe river which runs from Northern Alps of Japan into Japan Sea forms an alluvial fan in the range of 13km from the sea. NK-GHM which is a quasi-three dimensional hydrological cycle analysis model has been applied to clarify hydrological cycle in this area including seepage/discharge from/to the river. The model was tested by comparing with river flow rate, groundwater height and other observations and the model well described the observations.
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