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Erosion Control and Growth Promotion of W-OH Material on Red Clay Highway Slopes: A Case Study in South China

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  • Xiao-chun Qin

    (College of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China)

  • An-chen Ni

    (College of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China)

  • Nan Zhang

    (RIOH Transport Consultants Ltd., Beijing 100191, China)

  • Zheng-hao Chen

    (College of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China)

Abstract

Ecological restoration is difficult on the red clay highway slopes in the rainy areas in South China that experience severe soil erosion. By using the hydrophilic polyurethane material W-OH to solidify and protect red clay slopes, the erosion control will be substantially improved. We employed simulated rainfall erosion experiments and pot experiments to evaluate the anti-corrosion and growth promotion performances. We found that, (1) in the initial stage of protection, W-OH had the effect of accelerating slope drainage, solidifying the soil structure, and reducing soil loss, with the sediment reduction benefit reaching 37.4–65.3%. (2) The anti-erosion effect was mainly based on soil solidification. (3) The W-OH was affected by rainfall intensity and the W-OH concentration, and the soil erosion prediction equation was constructed according to the observation. (4) W-OH had a promising water retention performance and can promote the germination and late growth of slope plants to reduce the influence of eluviation. (5) The suitable W-OH solution concentration was 3–5% for slope protection herbs and shrubs, which were commonly used in South China. (6) The reduction in porosity was the fundamental cause of water retention improvement. The ecological restoration of slopes is a comprehensive process. Therefore, both anti-erosion performance and later plant growth are necessary. Our research provides a theoretical and experimental basis for applying the W-OH in the ecological restoration of the red clay slopes in subtropical areas and expanding the scope of the W-OH.

Suggested Citation

  • Xiao-chun Qin & An-chen Ni & Nan Zhang & Zheng-hao Chen, 2021. "Erosion Control and Growth Promotion of W-OH Material on Red Clay Highway Slopes: A Case Study in South China," Sustainability, MDPI, vol. 13(3), pages 1-16, January.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:3:p:1144-:d:485167
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    References listed on IDEAS

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    1. Melanie Maxwald & Cesare Crocetti & Roberto Ferrari & Alessandro Petrone & Hans Peter Rauch & Federico Preti, 2020. "Soil and Water Bioengineering Applications in Central and South America: A Transferability Analysis," Sustainability, MDPI, vol. 12(24), pages 1-31, December.
    2. Hwang-Hee Kim & Chun-Su Kim & Ji-Hong Jeon & Seung-Kee Lee & Chan-Gi Park, 2017. "Performance Evaluation and Field Application of Red Clay Green Roof Vegetation Blocks for Ecological Restoration Projects," Sustainability, MDPI, vol. 9(3), pages 1-16, February.
    3. Chunfeng Jia & Bao-ping Sun & Xinxiao Yu & Xiaohui Yang, 2019. "Evaluation of Vegetation Restoration along an Expressway in a Cold, Arid, and Desertified Area of China," Sustainability, MDPI, vol. 11(8), pages 1-13, April.
    4. Chunfeng Jia & Baoping Sun & Xinxiao Yu & Xiaohui Yang, 2020. "Analysis of Runoff and Sediment Losses from a Sloped Roadbed under Variable Rainfall Intensities and Vegetation Conditions," Sustainability, MDPI, vol. 12(5), pages 1-11, March.
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    Cited by:

    1. Jin Liao & Zhen Liu & Cuiying Zhou & Qingxiu Zhang, 2022. "Disintegration Resistance of Steep-Rocky-Slope Wall-Hanging Soil Based on High-Performance Ester Materials," Sustainability, MDPI, vol. 14(14), pages 1-20, July.

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