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On-line Access: 2019-07-04

Received: 2018-03-06

Revision Accepted: 2019-06-17

Crosschecked: 2019-06-18

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Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Chung Fai Chiu

https://orcid.org/0000-0002-6591-7130

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Journal of Zhejiang University SCIENCE A 2019 Vol.20 No.7 P.546-552

http://doi.org/10.1631/jzus.A1800145


Effects of shrub on one-dimensional suction distribution and water infiltration in a three-layer landfill cover system


Author(s):  Sandar Lin, Charles W.W. Ng, Jie Xu, Rui Chen, Jian Liu, Zhong-kui Chen, Chung Fai Chiu

Affiliation(s):  Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; more

Corresponding email(s):   acf_chiu@stu.edu.cn

Key Words:  Shrub, 1D suction, Water infiltration, Landfill cover, Soil column


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Sandar Lin, Charles W.W. Ng, Jie Xu, Rui Chen, Jian Liu, Zhong-kui Chen, Chung Fai Chiu. Effects of shrub on one-dimensional suction distribution and water infiltration in a three-layer landfill cover system[J]. Journal of Zhejiang University Science A, 2019, 20(7): 546-552.

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journal="Journal of Zhejiang University Science A",
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pages="546-552",
year="2019",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1800145"
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%A Charles W.W. Ng
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DOI - 10.1631/jzus.A1800145


Abstract: 
Generally, landfill caps are covered with plants to prevent erosion and maintain a natural environment attractive to birds and other wildlife. Plants extract moisture from landfill cover soils during transpiration, and increase soil matric suction, consequently reducing water permeability and influencing the performance of the landfill cover during wetting. However, the effects of plants on suction distribution during drying and their consequent effect on the performance of a landfill cover system during wetting have not been investigated thoroughly. In this study, two soil column tests (one planted with the shrub Schefflera arboricola and the other one bare) were carried out to investigate the effects of shrub on 1D suction distribution in a three-layer landfill cover system during drying and wetting, and on the effectiveness of the landfill cover system in preventing water infiltration upon wetting. Despite the planted column having a higher infiltration rate, the shrub enhanced the effectiveness of the three-layer landfill cover system in preventing water percolation because of its higher induced suction from drying, leading to a higher water storage capacity.

This paper presented the effects of shrub on the suction distribution in a three-layer landfill cover during drying and wetting, and examined the effectiveness of such a system to prevent water infiltration upon wetting via soil column testing. Novelty of this study lied on the plants' hydraulic effects on three-layer system. In general the paper was well-written.

灌木对三层填埋场覆盖系统一维吸力分布和水分入渗的影响

目的:研究灌木对干燥和湿润过程中三层土质覆盖系统的吸力分布的影响.
创新点:发现对于三层土质覆盖系统,干燥过程中植物蒸腾作用不仅提高了土的吸力,同时也增加了土层之间的吸力梯度(图3).
方法: 通过土柱试验模拟干燥和湿润过程,并测量吸力的变化.
结论:1. 植物蒸腾作用导致植有灌木的土在干燥过程中所产生的吸力较没有植物的土高60%~200%. 2. 植物蒸腾作用提高了植有灌木的土的持水能力; 在湿润过程中水分穿透植有灌木的土所需时间比没有植物的土长50%(图3~4).

关键词:灌木; 填埋场覆盖系统; 吸力; 土柱试验

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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