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Open AccessArticle

Behaviour of Capillary Barrier Covers Subjected to Rainfall with Different Patterns

by 1,2,*, 1 and 1
1
Department of Civil Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
2
Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(11), 3133; https://doi.org/10.3390/w12113133
Received: 14 October 2020 / Revised: 4 November 2020 / Accepted: 6 November 2020 / Published: 9 November 2020
(This article belongs to the Section Hydrology and Hydrogeology)
The behaviour of capillary barrier covers (CBCs) subjected to rainfall has been extensively studied by many researchers. However, the patterns of rainfall are seldom considered in previous studies, and therefore, the behaviour of CBCs subjected to rainfall with different patterns is still unknown. To this end, this study aims to investigate the effect of rainfall patterns on the behaviour and performance of CBCs, and identify the rainfall pattern, under which the performance of the CBC is the worst. Using a newly developed soil column test apparatus, a series of laboratory soil column experiments were conducted. The results indicated that when rainfall duration is short, the patterns of rainfall only affect the volume water content (VWC) and pore water pressure (PWP) significantly at the upper part of the column; when rainfall duration is long, the patterns of rainfall can significantly affect the VWC and PWP throughout the whole column. The percolation and breakthrough time of the CBC were also influenced by rainfall patterns; the advanced rainfall pattern produced the largest percolation, and resulted in the shortest time for CBCs to break through, whereas the delayed rainfall pattern generated the least percolation and resulted in the longest time for CBCs to break through. Based on the percolation and breakthrough time, it seems that the advanced pattern is the worst-case scenario for the CBCs subjected to rainfall. The obtained results not only imply the necessity of rainfall patterns to be involved in the study of the CBCs subjected to rainfall but they also can be helpful for the practical design of the CBCs. View Full-Text
Keywords: landfill; capillary barrier covers; rainfall patterns; rainfall infiltration; soil column landfill; capillary barrier covers; rainfall patterns; rainfall infiltration; soil column
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MDPI and ACS Style

Li, N.; Jiang, H.; Li, X. Behaviour of Capillary Barrier Covers Subjected to Rainfall with Different Patterns. Water 2020, 12, 3133. https://doi.org/10.3390/w12113133

AMA Style

Li N, Jiang H, Li X. Behaviour of Capillary Barrier Covers Subjected to Rainfall with Different Patterns. Water. 2020; 12(11):3133. https://doi.org/10.3390/w12113133

Chicago/Turabian Style

Li, Ning; Jiang, Haohong; Li, Xinzhen. 2020. "Behaviour of Capillary Barrier Covers Subjected to Rainfall with Different Patterns" Water 12, no. 11: 3133. https://doi.org/10.3390/w12113133

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