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a60b0p26.pdf | 4.69 MB | Adobe PDF | 見る/開く |
タイトル: | ゲリラ豪雨予測の高精度化に向けた積乱雲の鉛直渦管生成メカニズムに関する研究 |
その他のタイトル: | Studies on Formation Mechanism of Vertical Vortex Tube inside Cumulonimbus Cloud for Accuracy Improvement of Guerrilla-heavy Rainfall Prediction |
著者: | 中北, 英一 佐藤, 悠人 山口, 弘誠 https://orcid.org/0000-0002-0885-169X (unconfirmed) |
著者名の別形: | NAKAKITA, Eiichi SATO, Hiroto YAMAGUCHI, Kosei |
キーワード: | ゲリラ豪雨 渦度 渦管 上昇流 水平風の鉛直シア Guerrilla-Heavy Rainfall Vorticity Vortex tube Updraft Vertical shear of horizontal wind |
発行日: | Sep-2017 |
出版者: | 京都大学防災研究所 |
誌名: | 京都大学防災研究所年報. B |
巻: | 60 |
号: | B |
開始ページ: | 539 |
終了ページ: | 558 |
抄録: | In Japan, the frequency of Guerrilla-heavy rainfall is increasing, so it is quite important to predict heavy rainfall even within a few minutes. Nakakita et al. (2016) discovered the large vertical vorticity inside the baby cell aloft is useful to predict the Guerrilla-heavy rainfall, and also discovered the baby cells have vertical vortex tubes. By these results, we considered that the horizontal vortex tubes were caused by vertical shear of horizontal wind and these were tilted into vertical by an updraft. This hypothesis is popular in large scaled clouds, but it is not unclear in small scaled clouds. This paper shows two findings. One is that the strongest updraft exists between positive and negative vorticity using high ZDR column and multi Doppler technique. The other is that Guerrilla-heavy rainfall is caused by not so strong vertical shear as liner convective system. These unlock the developing process of small scaled cumulonimbus cloud. |
URI: | http://hdl.handle.net/2433/229372 |
関連リンク: | http://www.dpri.kyoto-u.ac.jp/publications/nenpo/ |
出現コレクション: | Vol.60 B |
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