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Article

Determination of Unsaturated Hydraulic Properties of Seepage Flow Process in Municipal Solid Waste

by 1,2, 1, 2,3,4,*, 2,3,4 and 5
1
School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, China
2
Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
3
IRSM-CAS/HK PolyU Joint Laboratory on Solid Waste Science, Wuhan 430071, China
4
Hubei Province Key Laboratory of Contaminated Sludge & Soil Science and Engineering, Wuhan 430071, China
5
School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
*
Author to whom correspondence should be addressed.
Academic Editors: Helena M. Ramos and Steffen Berg
Water 2021, 13(8), 1059; https://doi.org/10.3390/w13081059
Received: 10 March 2021 / Revised: 30 March 2021 / Accepted: 8 April 2021 / Published: 12 April 2021
The unsaturated hydraulic characteristics of waste soil are an essential basis for predicting and evaluating leachate migration and distribution in landfills. The saturated water content and permeability coefficient were measured, and a multi-step drainage monitoring experiment was conducted indoors at different dry densities, particle sizes, and degradation ages. Single and dual permeability models were adopted to determine the unsaturated hydraulic characteristic parameters of waste. Results show that dry density and particle size are the key factors affecting the saturated water content and permeability of waste. A single degradation age has little effect on it. Respectively, the saturated water content has a linear relationship with dry density, and permeability has an exponential relationship with dry density under limited experimental data. The overflow numerical inversion method can accurately obtain the unsaturated hydraulic characteristic parameters of wastes and summarizes the values of the unsaturated hydraulic characteristic parameters of wastes with different attributes in the literature and the results of this study. The dual-permeability model performed significantly better than the single-permeability model for water movement, suggesting that a dual-domain description is required for water flow in landfills. View Full-Text
Keywords: municipal solid waste; hydraulic properties; preferential flow; numerical inverse municipal solid waste; hydraulic properties; preferential flow; numerical inverse
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MDPI and ACS Style

Zhang, C.; Liang, B.; Liu, L.; Wan, Y.; Zhu, Q. Determination of Unsaturated Hydraulic Properties of Seepage Flow Process in Municipal Solid Waste. Water 2021, 13, 1059. https://doi.org/10.3390/w13081059

AMA Style

Zhang C, Liang B, Liu L, Wan Y, Zhu Q. Determination of Unsaturated Hydraulic Properties of Seepage Flow Process in Municipal Solid Waste. Water. 2021; 13(8):1059. https://doi.org/10.3390/w13081059

Chicago/Turabian Style

Zhang, Chai; Liang, Bing; Liu, Lei; Wan, Yong; Zhu, Qichen. 2021. "Determination of Unsaturated Hydraulic Properties of Seepage Flow Process in Municipal Solid Waste" Water 13, no. 8: 1059. https://doi.org/10.3390/w13081059

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