[1]Li Pengfei,Cao Kai,Hu Jinfei,et al.The spatial heterogeneity and mechanisms of hillslope erosion under different rainfall intensities in hilly and gully Loess Plateau[J].Research of Soil and Water Conservation,2025,32(01):1-12.[doi:10.13869/j.cnki.rswc.2025.01.004]
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The spatial heterogeneity and mechanisms of hillslope erosion under different rainfall intensities in hilly and gully Loess Plateau
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
32
Number of periods:
2025 01
Page number:
1-12
Column:
Public date:
2025-01-10
- Title:
- The spatial heterogeneity and mechanisms of hillslope erosion under different rainfall intensities in hilly and gully Loess Plateau
- Keywords:
- erosion; deposition; hydrodynamics; simulated rainfall; terrestrial Laser scanning; hilly and gully Loess Plateau
- CLC:
- S157.1
- DOI:
- 10.13869/j.cnki.rswc.2025.01.004
- Abstract:
- [Objective]Clarifying the detailed spatiotemporal distribution characteristics of erosion and deposition on filed slopes, as well as the relationship with hydrodynamic parameters, is essential for deepening the understanding of the processes of sediment production in slope erosion. [Methods]Three runoff plots(5 m×1.5 m)on natural slopes were set in the Xindiangou watershed of the hilly and gully region of the Loess Plateau. Then continuous rainfall experiments were conducted under rainfall intensities of 90, 120, and 150 mm/h for 10 consecutive rainfall events. Based on ground-based terrestrial laser scanning(TLS), the spatiotemporal characteristics of soil erosion and deposition were studied. The variations of hydraulic parameters in different slope segments and their relationships with corresponding soil erosion rate and sediment yield were explored. [Results](1)Soil erosion increased with the increase of rainfall intensity. The most severe erosion occurred in the D and E slope segments with the reduced and dispersed sedimentation, especially for the E slope segment. In terms of erosion area, under rain intensities of 90 and 150 mm/h, the B slope segment was the largest, followed by the C slope segment, and the D slope segment was the smallest; under the rain intensity of 120 mm/h, the B slope segment was the largest, and the C slope segment was the smallest.(2)There is a reciprocal feed effect between hydraulic parameters and the slope roughness, resulting in the fluctuating changes of hydraulic parameters. When the soil gradually becomes saturated and reaches a stable infiltration state, the hydraulic parameters gradually tend to stabilize. Under the same rainfall intensity, the distance from the slope top was proportional to the Reynolds number, Froude number and unit runoff power, while it was inversely proportional to the runoff shear force and Darcy-Weisbach resistance coefficient.(3)Under rain intensities of 90 and 120 mm/h, runoff power was an important hydraulic parameter of the erosion process, and the Darcy-Weisbach resistance coefficient and unit runoff power were considered important hydraulic parameters in the deposition process. Under a rain intensity of 150 mm/h, the hydraulic characteristics were not related to the erosion rate and sediment yield. [Conclusion]The relationship between slope erosion and hydrodynamic parameters varies under different rain intensities, with runoff power, Darcy-Weisbach resistance coefficient, and unit runoff power being important parameters in the sediment production process of natural slopes, and these parameters exhibit a linear relationship.
- References:
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Last Update:
2025-01-10