| Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences | Host |
| Groundwater Science and Engineering Limited | Publish |
| Citation: |
Yu Guo-Qiang, Wang Qian, Zhu Li-Feng, Zhang Xia. 2023. Regulation of vegetation pattern on the hydrodynamic processes of erosion on hillslope in Loess Plateau, China. Journal of Groundwater Science and Engineering, 11(1): 4-19. doi: 10.26599/JGSE.2023.9280002
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Regulation of vegetation pattern on the hydrodynamic processes of erosion on hillslope in Loess Plateau, China
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Abstract
As vegetation are closely related to soil erosion, hydrodynamic parameter changes under various vegetation pattern conditions can be used as an important basis for the research of the soil erosion mechanism. Through upstream water inflow experiments conducted on a loess hillslope, how the vegetation pattern influences the hydrodynamic processes of sediment transport was analyzed. The results show that the placement of a grass strip on the lower upslope can effectively reduce runoff erosion by 69%, relying on the efficiency of regulated hydrodynamic process. The effective location of grass strip for hillslope alleviating erosion is on the lower part of the upslope, mainly due to the grass strip measure used to regulate the hydrodynamic system. As a result, the underlying surface runoff resistance is increased by 5 times, runoff shear stress is decreased by more than 90%, and runoff power decreased by over 92%. The measure greatly separates the scouring energy of surface runoff that acts on the slope soil. Therefore, the use of grass strips effectively decreases the energy of runoff flowing along the slope, eliminating soil erosion to a great extent and thereby achieving a better regulation of hydrodynamic processe.
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Keywords:
- Soil erosion /
- Grass strip /
- Scouring experiment /
- Sediment transport /
- Regulating mechanism /
- Loess Plateau
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References
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Yu Guo-Qiang, Wang Qian, Zhu Li-Feng, Zhang Xia. 2023. Regulation of vegetation pattern on the hydrodynamic processes of erosion on hillslope in Loess Plateau, China. Journal of Groundwater Science and Engineering, 11(1): 4-19. doi: 10.26599/JGSE.2023.9280002
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Figure 1.
Set-up of the hillslope scouring experiment
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Figure 2.
Schematic of scouring–vegetation pattern design
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Figure 3.
Temporal and spatial variation in runoff resistance under bare-slope condition
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Figure 4.
Temporal variation in runoff resistance at different cross-sections for different vegetation patterns
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Figure 5.
Spatial variation in runoff resistance at different moments for different vegetation patterns
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Figure 6.
Effect of vegetation pattern on Darcy–Weisbach resistance f at different moments and cross-sections
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Figure 7.
Temporal and spatial variation in runoff shear stress under bare-slope conditions
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Figure 8.
Temporal variation in runoff shear stress at different cross-sections for different vegetation patterns
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Figure 9.
Spatial variation in runoff shear stress at different moments for different vegetation patterns
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Figure 10.
Effect of vegetation pattern on runoff shear stress τ
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Figure 11.
Temporal and spatial variation in runoff power under bare-slope conditions
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Figure 12.
Temporal variation in runoff power at different cross-sections
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Figure 13.
Spatial variation in runoff power at different moments for different vegetation patterns
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Figure 14.
Effect of vegetation pattern on runoff power
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Figure 15.
The total amount of the runoff and sediment yield under different distributions of grass strips