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Experimental Investigation of Water-Retaining and Unsaturated Infiltration Characteristics of Loess Soils Imbued with Microplastics

Author

Listed:
  • Jiahui Gu

    (School of Civil Engineering and Transportation, Hohai University, Nanjing 210098, China
    Key Laboratory of Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China)

  • Liang Chen

    (School of Civil Engineering and Transportation, Hohai University, Nanjing 210098, China
    Key Laboratory of Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China)

  • Yu Wan

    (School of Civil Engineering and Transportation, Hohai University, Nanjing 210098, China
    Key Laboratory of Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China)

  • Yaozong Teng

    (School of Civil Engineering and Transportation, Hohai University, Nanjing 210098, China
    Key Laboratory of Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China)

  • Shufa Yan

    (School of Civil Engineering and Transportation, Hohai University, Nanjing 210098, China
    Key Laboratory of Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China)

  • Liang Hu

    (School of Civil Engineering and Transportation, Hohai University, Nanjing 210098, China
    Key Laboratory of Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China)

Abstract

Microplastics are abundant in agricultural soils and have significant impacts on rainfall infiltration and soil water-retaining capacity. To explore the effect of microplastics on agricultural soil permeability by simulating the rainfall irrigation process, a one-dimensional vertical soil column rainfall infiltration test device was used to study the unsaturated infiltration characteristics of loess soil imbued with microplastics under rainfall conditions. The following conclusions could be obtained: the microplastic content ( q ), the microplastic particle size ( p ), and the soil density ( γ ) have effects on rainfall infiltration; the soil water-retaining capacity would be weakened owing to the existence of microplastics; and intermittent rainfall is preferred in agricultural irrigation. Finally, the permeability coefficient ( k ) and average flow rate ( V ) of the unsaturated soil are deduced together, and the relationship between the permeability coefficient ( k ) and the matrix suction ( ψ ) of the unsaturated loess soil containing microplastics is calculated by an example, proving good consistency between the experimental results and theoretical calculations. Microplastics represent negative effects on rainfall infiltration and soil water retention, so it is recommended to dispose of them.

Suggested Citation

  • Jiahui Gu & Liang Chen & Yu Wan & Yaozong Teng & Shufa Yan & Liang Hu, 2022. "Experimental Investigation of Water-Retaining and Unsaturated Infiltration Characteristics of Loess Soils Imbued with Microplastics," Sustainability, MDPI, vol. 15(1), pages 1-18, December.
    • Handle: RePEc:gam:jsusta:v:15:y:2022:i:1:p:62-:d:1009728
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