Hydraulic properties in the flow with floating plants

Han Jie; Huai Wenxin; Zhao Mingdeng

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Hydraulic properties in the flow with floating plants

Han Jie,Huai Wenxin *,Zhao Mingdeng

State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072

*Correspondence author

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Funding: the Specialized Research Fund for the Doctoral Program of Higher Education （No.No. 20100141110028）, the Natural Science Foundation of China （No.No. 50679061, 10972163）

Opened online: 3 February 2011

Accepted by: none

Citation: Han Jie,Huai Wenxin,Zhao Mingdeng.Hydraulic properties in the flow with floating plants[OL]. [ 3 February 2011] http://en.paper.edu.cn/en_releasepaper/content/4408166

This paper focuses on the hydraulic properties of a turbulent flow with floating plants in straight ditches. Light plastic clusters were used to simulate the floating plants in laboratory and Micro ADV with the maximum frequency of 50 Hz was adopted to measure the turbulent flow. Experimental results of stream-wise velocity shows that the flow can be divided into a roots layer with uniform velocity and a water layer, which can be further divided into an upper and a lower sub-layer. As the theoretical analysis, the poroelastic theory is applied by regarding plant roots as an immovable skeleton. The control equations are simplified and solved to give the vertical distribution of velocity and shear stress, which agree well with the experimental data. The results indicate that the velocity distribution fits to the logarithm law in both upper and lower water layers. Otherwise, as the roughness of the roots is greater than the bed, the boundary of the two sub-layers is closer to the bed.

Keywords:hydraulics; floating plant; poroelastic theory; mixing length approach

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