1kmメッシュ解析雨量の精度検証―関東甲信越地方と東北地方における解析―  [in Japanese] ACCURACY OF RADAR-RAINGAUGE ANALYZED PRECIPITATION: ANALYSIS IN KANTO, KOSHIN-ETSU, AND TOHOKU REGIONS  [in Japanese]

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Abstract

1kmメッシュの国土交通省解析雨量について,東日本旅客鉄道株式会社が関東甲信越地方と東北地方に設置した498基の雨量計の観測値を用いて精度検証を行った.この結果,1時間雨量では両者の相関は高い場合が多いが,一部に乖離がみられる場合があること,24時間雨量では両者の相関は高いことを示した.また,1時間雨量では解析雨量が雨量計の観測値に比べて平均的には1割程度小さい値を示し,24時間雨量では両者は同程度の値を示すことが分かった.さらに,解析雨量の精度には地域的な偏りがあり,解析雨量と雨量計の観測値の相関が高い地域と低い地域があることが分かった.

 In this study, we analyzed the accuracy of 1-km mesh Radar-Raingauge analyzed precipitation transmitted by the Ministry of Land, Infrastructure, Transport and Tourism. This analysis was compared with Radar-Raingauge analyzed precipitation and precipitation data observed by 498 rain gauges installed by East Japan Railway Company in Kanto, Koshin-etsu, and Tohoku regions. As a result, within a 1-hour rainfall, the majority of cases showed close correlation between precipitations provided by Radar-Raingauge analyzed precipitation and by rain gauge, but there were also cases of divergence. Furthermore, precipitations provided by Radar-Raingauge analyzed precipitation tends to average 10 % less than those provided by rain gauges. However, within a 24-hour rainfall, precipitations were closely correlated and on average were practically equal. It should also be mentioned that we found differences in accuracy depending on geographical area; some areas were more closely correlated than others.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 73(4), I_13-I_18, 2017

    Japan Society of Civil Engineers

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