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Effects of rainfall and the slope gradient on the soil and water loss in a purple soil area

Author

Listed:
  • Xinyi Zhang

    (Key Laboratory of Regional Energy and Environmental Systems Optimization, Ministry of Education, North China Electric Power University, Beijing, P.R. China)

  • Qiande Zhu

    (State Key Laboratory of Hydrology and Water Resources and Hydraulic Engineering Science, Nanjing, P.R. China)

  • Jing Sang

    (Key Laboratory of Regional Energy and Environmental Systems Optimization, Ministry of Education, North China Electric Power University, Beijing, P.R. China)

  • Xiaowen Ding

    (Key Laboratory of Regional Energy and Environmental Systems Optimization, Ministry of Education, North China Electric Power University, Beijing, P.R. China)

Abstract

Soil and water losses in purple soil area is becoming an increasingly severe problem, bringing enormous challenges to environmental protection in rural areas. In this study, simulated rainfall experiments were conducted to analyse the effects of rainfall and the slope conditions on the soil and water loss. Purple soil from a typical slope in the Beibei District of Chongqing was selected as the experimental soil. Twenty rainfall scenarios with varying rainfall intensities and slope conditions were created in the simulation. The results indicate that the runoff initiation time shortened with an increased rainfall intensity and slope gradient. There was a logarithmic relationship between the effect of the rainfall amount on both the runoff intensity and sediment yield intensity. Generally, both the runoff and sediment yield showed a positive linear relationship with the rainfall intensity under different slope gradient conditions. In terms of the same rainfall intensity, both the runoff intensity and sediment yield intensity increased with the slope. Furthermore, a critical slope gradient for the soil and water loss was found between 20° and 25°. This study aimed to provide a reference for soil and water conservation research in a purple soil area.

Suggested Citation

  • Xinyi Zhang & Qiande Zhu & Jing Sang & Xiaowen Ding, 2022. "Effects of rainfall and the slope gradient on the soil and water loss in a purple soil area," Soil and Water Research, Czech Academy of Agricultural Sciences, vol. 17(4), pages 232-242.
    • Handle: RePEc:caa:jnlswr:v:17:y:2022:i:4:id:45-2022-swr
    DOI: 10.17221/45/2022-SWR
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    References listed on IDEAS

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    1. S. Mishra & Anubhav Chaudhary & Raj Shrestha & Ashish Pandey & Mohan Lal, 2014. "Experimental Verification of the Effect of Slope and Land Use on SCS Runoff Curve Number," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 28(11), pages 3407-3416, September.
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