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

Jiahui Gu, Liang Chen, Yu Wan (), Yaozong Teng, Shufa Yan and Liang Hu
Additional contact information
Jiahui Gu: School of Civil Engineering and Transportation, Hohai University, Nanjing 210098, China
Liang Chen: School of Civil Engineering and Transportation, Hohai University, Nanjing 210098, China
Yu Wan: School of Civil Engineering and Transportation, Hohai University, Nanjing 210098, China
Yaozong Teng: School of Civil Engineering and Transportation, Hohai University, Nanjing 210098, China
Shufa Yan: School of Civil Engineering and Transportation, Hohai University, Nanjing 210098, China
Liang Hu: School of Civil Engineering and Transportation, Hohai University, Nanjing 210098, China

Sustainability, 2022, vol. 15, issue 1, 1-18

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.

Keywords: rainfall infiltration; water-retaining; loess soils; microplastics; volumetric moisture content; permeability coefficient (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2071-1050/15/1/62/pdf (application/pdf)
https://www.mdpi.com/2071-1050/15/1/62/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:15:y:2022:i:1:p:62-:d:1009728

Access Statistics for this article

Sustainability is currently edited by Ms. Alexandra Wu

More articles in Sustainability from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().