Generation Mechanism, Structure and Dynamics of Violent Vortices in the Atmospheric Boundary layer and their Roles in Turbulent Transport

大气边界层剧烈涡旋的产生机制、结构和动力学及其在湍流输运中的作用

• 批准号: 21340134
• 负责人: NIINO Hiroshi
• 金额: $ 11.48万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21340134/
• 关键词: 気象学; 対流混合層; 大気境界層; ラージ・エディ・シミュレーション; 渦; 塵旋風; 竜巻; 回転境界層; 蒸気旋風; 室内実験

Generation mechanisms, structures and dynamics of dust devils, steam devils and tornadoes are studied. Dust devils are formed when circulation about the vertical axis, which is generated at mid-levels in a convective mixed layer, is transported by downdrafts toward low-levels, and then to updraft regions while nearly conserving the angular momentum. Steam devils in a moist convective mixed layer without precipitation develop in a similar way to dust devils. Those with precipitation, however, are caused by collisions of boundaries of cold pools from precipitating area. Radial distribution of tangential velocity in these strong vortices is found to have two different regimes which are dominated by the dynamics of a rotating boundary layer.

研究了尘卷风、蒸汽卷风和龙卷风的产生机制、结构和动力学。当围绕垂直轴的环流（在对流混合层的中层产生）被下降气流输送到低层，然后输送到上升气流区域时，形成尘暴，同时几乎保持角动量。没有降水的潮湿对流混合层中的蒸汽恶魔的发展方式与尘暴类似。而有降水的则是降水区冷池边界碰撞造成的。发现这些强涡流中切向速度的径向分布具有两种不同的状态，这两种状态由旋转边界层的动力学主导。

项目成果

Large Eddy Simulation of Dust Devils in a Diurnally-Evolving Convective Mixed Layer

• DOI: 10.2151/jmsj.2010-105
• 发表时间: 2010-02
• 期刊: Journal of the Meteorological Society of Japan
• 影响因子: 3.1
• 作者: J. Ito;R. Tanaka;H. Niino;M. Nakanishi

Large Eddy Simulation of Dust Devils in a Convective Mixed Layer

对流混合层中尘暴的大涡模拟

• 发表时间: 2010
• 作者: J. Ito;H. Niino;and M. Nakanishi
• 通讯作者: and M. Nakanishi

円筒容器内で回転する水の表面変形とその履歴現象

圆柱形容器中旋转的水的表面变形及其历史现象

• 发表时间: 2011
• 作者: 渡邉俊一;新野宏;(他2名)
• 通讯作者: (他2名)

Large Eddy Simulation on Dust Suspension in a Convective Mixed Layer

• DOI: 10.2151/sola.2010-034
• 发表时间: 2010
• 期刊: Sola
• 影响因子: 1.9
• 作者: J. Ito;H. Niino;M. Nakanishi

シビア現象の理解・予測にむけた課題と期待

理解和预测严重现象的挑战和期望

• 发表时间: 2010
• 作者: Kano;A.;Shen;C.-C.;Hori;M.;Lin;K.;Chiu;T.-C.;Burr;G.S.;新野宏
• 通讯作者: 新野宏