Hydrodynamic Mechanism of Soil Erosion on Vegetation Covered Slopes

Sun Jiamei; Hou Peixuan; Pang Yubo; Zhang Zhenyao; Li Hanzhi

doi:10.13961/j.cnki.stbctb.2022.02.001

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Hydrodynamic Mechanism of Soil Erosion on Vegetation Covered Slopes

- Hydrodynamic Mechanism of Soil Erosion on Vegetation Covered Slopes
- Bulletin of Soiland Water Conservation Vol. 42, Issue 2, Pages: 1-7(2022)
- 作者机构：
  
  1. 中国科学院植物研究所植被与环境变化国家重点实验室,北京,100093
  2. 河北省林业和草原工程项目中心,河北,石家庄,050081
  3. 呼伦贝尔市海拉尔区农牧局综合保障中心,内蒙古,呼伦贝尔,021008
  4. 北京林业大学水土保持学院,北京,100083
  5. 中国林业科学研究院荒漠化研究所,北京,100091
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2022.02.001
  CLC： S157.1
- Published：2022
- 稿件说明：
移动端阅览
Sun Jiamei, Hou Peixuan, Pang Yubo, et al. Hydrodynamic Mechanism of Soil Erosion on Vegetation Covered Slopes[J]. Bulletin of Soiland Water Conservation, 2022, 42(2): 1-7.
DOI：

Sun Jiamei, Hou Peixuan, Pang Yubo, et al. Hydrodynamic Mechanism of Soil Erosion on Vegetation Covered Slopes[J]. Bulletin of Soiland Water Conservation, 2022, 42(2): 1-7. DOI： 10.13961/j.cnki.stbctb.2022.02.001.

摘要

[目的] 研究植被覆盖坡面土壤侵蚀发生的动力学机制，为揭示华北土石山区植被覆盖坡面侵蚀机理提供理论支撑。[方法] 从坡面径流水动力学特性出发，基于人工模拟降雨的方法，定量研究油松、侧柏、栓皮栎和酸枣覆盖坡面径流水动力学过程和侵蚀过程的相互关系。[结果] 侧柏覆盖坡面的产流量最大，平均总产流量为56.85 L。而产沙量最高的则是栓皮栎覆盖坡面，平均总产沙量高达1 189.15 g。各植被覆盖坡面径流流速范围为0.803±0.213~4.276±0.430 m/min。栓皮栎覆盖坡面径流流速最快，平均流速为2.930 m/min。4种植被覆盖坡面径流雷诺数和弗劳德数范围分别为7.271～62.630和0.177～0.900，径流雷诺数与弗劳德数均随着降雨强度的增大而增大。[结论] 坡面植被覆被具有良好的减流减沙效果。植被覆盖坡面径流水动力学要素与产沙率密切相关，是预测土壤侵蚀过程的重要因子。

Abstract

[Objective] The dynamic mechanism of soil erosion on vegetation covered slope was studied in order to provide theoretical support for revealing the mechanism of vegetation covered slope erosion in earth rock mountainous areas of North China. [Methods] Based on the runoff dynamic characteristics of slope and the method of artificial rainfall simulation

the relationships between runoff hydrodynamic characteristics and erosion processes on vegetation covered slopes (Pinus tabuliformis

Platycladus orientalis

Quercus variabilis and Ziziphus jujuba) were explored quantitively. [Results] The Platycladus orientalis covered slopes had the greatest runoff yield amount with mean value of 56.85 L. The Quercus variabilis covered slopes had the greatest sediment yield amount with mean value of 1 189.15 g. Runoff velocities under all 4 kinds vegetation ranged from 0.803±0.213 to 4.276±0.430 m/min. Reynolds number and Froude number increased with the increase of rainfall intensity

and the values varied 7.127～63.630 and 0.177～0.900

respectively. [Conclusion] Vegetation cover on the slope has a good effect of reducing runoff and sediment. The dynamic factors of runoff on slope are closely related to the sediment yield

which is an important factor to predict the process of soil erosion.

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