The presence of orderly arranged rows and spacing of crop vegetation increases the anisotropy of the Earth's surface, and affects the resistance of the surface to overland flow. However, few studies have addressed how the orderly arrangement of crop vegetation affects the resistance of the surface to overland flow. In the present study, we consider that flow resistance has anisotropic attributes. We have also performed a flow resistance experiment using rigid and simulated partially submerged crop vegetation. The simulation replicated water flow in different directions over the same crop vegetation and overland surface. The angles of flow direction and the crop rows were arranged as 15 °, 30 °, 45 °, and 90 °. The results show that the flow resistance of partially submerged crop vegetation is composed of surface resistance ns and vegetation resistance np. Vegetation resistance np is linearly proportional to the submerged vegetation height h, and the proportionality coefficient α (Δn/Δh) varies with the angle θ of the flow direction and the crop rows under the same water depth conditions, n15 > n30 > n45 > n90. Further regression analysis revealed that the relationship between the coefficient α and vertical projection width of crop stems in the flow direction is a power function.
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Research Article|
June 23 2016
Anisotropic flow resistance theory and experimental verification on partially submerged crop vegetation
Shengtang Zhang;
1College of Earth Science and Engineering, Shandong University of Science and Technology, 579 Qianwangang Road, Economic & Technical Development Zone, Qingdao 266590, China
E-mail: [email protected]
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Yin Liu;
Yin Liu
2College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China
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Jingzhou Zhang;
Jingzhou Zhang
1College of Earth Science and Engineering, Shandong University of Science and Technology, 579 Qianwangang Road, Economic & Technical Development Zone, Qingdao 266590, China
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Yuanchen Liu
Yuanchen Liu
1College of Earth Science and Engineering, Shandong University of Science and Technology, 579 Qianwangang Road, Economic & Technical Development Zone, Qingdao 266590, China
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Water Supply (2017) 17 (1): 24–31.
Article history
Received:
March 07 2016
Accepted:
June 07 2016
Citation
Shengtang Zhang, Yin Liu, Jingzhou Zhang, Yuanchen Liu; Anisotropic flow resistance theory and experimental verification on partially submerged crop vegetation. Water Supply 1 February 2017; 17 (1): 24–31. doi: https://doi.org/10.2166/ws.2016.107
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