Measurements of drag force of cylindrical rods and trees in a river

被引:0
|
作者
Shiono, K. [1 ]
Ferreira, E. [1 ]
Chandler, J. H. [1 ]
Wackrow, R. [1 ]
Ishigaki, T. [2 ]
机构
[1] Univ Loughborough, Sch Civil & Bldg Engn, Loughborough, Leics, England
[2] Kansai Univ, Fac Environm & Urban Engn, Osaka, Japan
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关键词
VEGETATION;
D O I
暂无
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A Force Measuring Device (FMD) is designed to measure drag force exerted on an object, such as cylindrical rods and real trees with and without leaves, by flow in a river. An approach velocity to the object was measured using Acoustic Doppler Velocimetry (ADV). The recovery velocity and turbulent intensity behind the object are also measured to understand turbulence in wake. A new estimation method of project area of objects using a photogrammetry technique is introduced. The measured drag force, the estimated project area and measured velocity distributions over water depth are used to calculate a drag coefficient. The influence of velocity distribution on the drag coefficient is demonstrated. The drag coefficient also shows a function of the rod Reynolds number.
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页码:535 / 542
页数:8
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