Clarification of Vortex Formations and Velocity Fluctuations in Rivers by Detailed Measurement and Their Applications

详细测量阐明河流涡流形成和流速脉动及其应用

• 批准号: 22560510
• 负责人: FUJITA Yuichiro
• 金额: $ 2.58万
• 依托单位: Gifu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22560510/
• 关键词: 水理学; 河川水理学; 乱流現象; 自然現象観測; ADCP; 水難事故; 水工水理学; 流体; 水圏現象; 水難危険箇所

At a river bend known as a danger spot of water accidents where small to large sized vortices appear complicatedly, moving observations and fixed point observations were carried out in parallel with an acoustic Doppler type of 3D velocity meter and those of current profilers. Additional experiments also were conducted. As the results, very sharp changes in riverbed topography are shown minutely and flows are clarified as plunge into deep part, well up along wall-like riverbed hump and plunge into again. Spatial-temporal scales and frequency properties of velocity fluctuations and changes in current directions are evaluated.

在被称为水上事故危险点的河流弯曲处，小到大尺寸的漩涡出现复杂，使用声学多普勒型三维流速仪和海流剖面仪并行地进行移动观测和定点观测。还进行了额外的实验。结果表明，河床地形的变化非常剧烈，水流表现为深入、沿沿着壁状河床隆起涌上、再深入的过程。时空尺度和频率特性的速度波动和电流方向的变化进行了评估。