[1]Guo Tianlei,Mei Xue,Ren Shunhua,et al.Response of runoff and sediment yield on purple soil spoil heaps to slope and rainfall intensity[J].Research of Soil and Water Conservation,2025,32(04):11-17,25.[doi:10.13869/j.cnki.rswc.2025.04.015]
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Response of runoff and sediment yield on purple soil spoil heaps to slope and rainfall intensity
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
32
Number of periods:
2025 04
Page number:
11-17,25
Column:
Public date:
2025-07-10
- Title:
- Response of runoff and sediment yield on purple soil spoil heaps to slope and rainfall intensity
- Keywords:
- spoil heaps; slope ratio; rainfall intensity; runoff; sediment yield
- CLC:
- S157.1
- DOI:
- 10.13869/j.cnki.rswc.2025.04.015
- Abstract:
- [Objective] This study aims to explore the effects of slope and rainfall intensity on the erosion characteristics of purple soil spoil heap slopes, providing scientific support for the standardized design of waste disposal sites and the prevention and control of soil erosion on spoil heap slopes in construction projects. [Methods] This study was conducted at the Jingangtuo waste disposal site, integrating rainfall characteristics along the Western Chongqing Water Resources Allocation Project and the stacking features of the disposal site. Two slope ratios(1:2.5 and 1:2) and three different rainfall intensities(60, 90, and 120 mm/h) were designed. Erosion, runoff, and sediment yield experiments were performed on the purple soil spoil heap slopes. [Results] At rainfall intensities of 90 mm/h and 120 mm/h, the initial runoff time was reduced by 30.15% and 56.62%, respectively, compared to the 60 mm/h intensity. The initial runoff time for the 1:2 slope ratio was shortened by 8.45% and 36.11%, respectively, compared to the 1:2.5 slope ratio. The time required for runoff to stabilize for the 1:2.5 and 1:2 slopes was 20 minutes and 10 minutes, respectively, with no significant difference in cumulative runoff volume. The sediment concentration and sediment yield rate for both slope ratios showed differences under different rainfall intensities. The cumulative sediment yield followed the order： 120 mm/h>90 mm/h>60 mm/h. Contribution analysis revealed that at rainfall intensities of 90 mm/h and 120 mm/h, the contribution rates of slope ratio were 28.57% and 12.92%, respectively, while the contribution rates of rainfall intensity were 71.43% and 87.08%. [Conclusion] The runoff and sediment yield from purple soil spoil heap slopes were affected by both slope and rainfall intensity, with rainfall intensity being the dominant factor.
- References:
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Last Update:
2025-07-20