Study on the influence of rigid plant roots and stems on the maximum shearing characteristics of boundary layer under regular wave

Li Xie; Chen Jie; Jiang Changbo; Yao Zhen; Luo Yuanpin; Luo Wanjiao

doi:10.12284/hyxb2021181

Volume 43 Issue 12

Dec. 2021

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Li Xie，Chen Jie，Jiang Changbo, et al. Study on the influence of rigid plant roots and stems on the maximum shearing characteristics of boundary layer under regular wave[J]. Haiyang Xuebao，2021, 43(12)：102–110 doi: 10.12284/hyxb2021181

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Study on the influence of rigid plant roots and stems on the maximum shearing characteristics of boundary layer under regular wave

doi: 10.12284/hyxb2021181

Li Xie^1
,,
Chen Jie^{1, 2, 3, 4
,
,},
Jiang Changbo^{1, 2, 3, 4},
Yao Zhen¹,
Luo Yuanpin¹,
Luo Wanjiao¹

1.
School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, China
2.
Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha 410114, China
3.
Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, China
4.
Engineering and Technical Center of Hunan Provincial Environmental Protection for River-Lake Dredging Pollution Control, Changsha 410114, China

Received Date: 2020-07-10
Rev Recd Date: 2021-06-01

Available Online: 2021-12-07

Publish Date: 2021-12-30

Abstract

Abstract

The characteristics of the maximum shear force in the boundary layer were studied based on the wave attenuation experiment of nearshore plants considering the influence of roots. The maximum shear force characteristics of the boundary layer under two plant models, root alone and combination of roots and stems, were investigated by using the formula of boundary layer velocity calculation with plant water flow under regular waves proposed by predecessors. The shear force variation along the path and the effect of plants on the shear force attenuation characteristics of the two models were analyzed, and the formulas of the attenuation coefficients were fitted. Studies have shown that when waves pass through the plant zone, the shear force increases to a certain extent and then decreases gradually. The reduction effect of plant on shear force increases with the increase of incident wave height, and the stem contributes to the reduction effect of root group on the maximum shear force of boundary layer, and the reduction coefficient ranges from 0.06 to 0.61. The fitted formula is more suitable for shallow water.
- generalized plant model,
- boundary layer,
- shear force,
- root,
- stem,
- regular wave

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References(23)

References

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