[1]Zhu Yan,Wang Ping,Ma Lan,et al.Effects of Vegetation Combinations on Hydrodynamic Characteristics of Overland Flow[J].Research of Soil and Water Conservation,2024,31(06):74-85.[doi:10.13869/j.cnki.rswc.2024.06.013]
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Effects of Vegetation Combinations on Hydrodynamic Characteristics of Overland Flow
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
31
Number of periods:
2024 06
Page number:
74-85
Column:
Public date:
2024-12-10
- Title:
- Effects of Vegetation Combinations on Hydrodynamic Characteristics of Overland Flow
- CLC:
- S157.1
- DOI:
- 10.13869/j.cnki.rswc.2024.06.013
- Abstract:
- [Objective]Indoor flume experiments were conducted to clarify the response trend of overland flow dynamics to various vegetation combinations,to explore the composition of resistance covered by different vegetation combinations, and to explore the regulation mechanism of vegetation combination on overland flow, so as to provide reference basis for rational layout of slope water storage and soil conservation projects. [Methods]The research analyzed the response law, flow resistance variation, and resistance composition of overland flow hydrodynamic parameters under the conditions of different vegetation combinations(single shrub, single grass cover, single row alternation of shrub and grass, alternation of shrub and grass, and bare slope), 3 different slope gradients(1°, 5°, 9°)and 5 kinds of discharge(20, 30, 40, 60, 80 L/min). [Results]Vegetation had significant effects on water depth, average velocity, flow pattern, and resistance coefficient(p<0.05). Compared to bare slope, water depth was 1.07～4.17 times higher with vegetation, and the velocity decreased 2.35%～64.7%. Besides, most experimental flow fell in the transition states. Turbulence intensity of different vegetation combinations followed the order: shrub-grass combination>single vegetation>bare slope. Furthermore, the resistance coefficient under vegetation cover was 1.25～25.45 times larger than bare slope, and the effect of water blocking and velocity slowing followed the order: single shrub>shrub-grass combination>single grass cover>bare slope. Resistance was affected by vegetation combination and stem characteristics(p<0.05). The flow resistance was mainly composed of particle resistance and vegetation resistance under single vegetation cover. However, the interference of rough elements produced additional resistance under shrub-grass combination cover, which weakened the flow resistance with an increase of slope gradient, but strengthened the flow resistance with an increase in discharge under the same slope condition. [Conclusion]The effect of single shrub group is the best, and the effect of interleaved shrub group is similar.
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Last Update:
2024-12-10