Modelling of contaminant transport in heterogeneous vertical barrier

IF 1.7 4区环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES Water and Environment Journal Pub Date : 2023-08-07 DOI:10.1111/wej.12896

Shaoyi Wang, Jiawei Wu, Cai Peifu, Chen Cong, Shenghua Ye, Jianqiang Xu, Chen Liang, Xiaoyong Luo, Wei Jun

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Abstract

Vertical barrier technique is an ideal candidate for site contamination control. In practical application, the characteristic of vertical cut‐off wall is heterogeneous with permeability decreases with depth due to the increasing geostatic stress. In this study, a numerical model was established considering the coupling effect of groundwater flow and contaminant transport considering depth dependent permeability. The results showed that a heterogeneous barrier with variable permeability can reduce the breakthrough time by 63.7% compared to a fixed permeability barrier. The contaminant concentration inside the wall was up to 10 times higher than outside. Shallow leakage occurs where the horizontal migration is dominated by advection. The distribution of pore‐water pressure in the system after the installation of high‐density polyethylene (HDPE) membranes significantly reduced the shallow convective effect by reducing up to 90% pore‐water pressure. Reinforcing the vertical barrier wall using HDPE membrane can effectively prevent the shallow leakage caused by the heterogeneity.

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污染物在非均质垂直屏障中传输的建模

垂直屏障技术是现场污染控制的理想选择。在实际应用中，竖向防渗墙具有非均匀性，由于静地应力的增加，渗透率随深度的增加而降低。在此基础上，建立了考虑地下水渗流与污染物运移耦合效应的数值模型。结果表明，与固定渗透率屏障相比，可变渗透率非均质屏障可使突破时间缩短63.7%。墙内的污染物浓度是墙外的10倍。浅层泄漏发生在水平运移以平流为主的地方。安装高密度聚乙烯(HDPE)膜后，系统中的孔隙水压力分布显著降低了浅对流效应，孔隙水压力降低了90%。用HDPE膜加固垂直屏障墙，可以有效防止非均质性引起的浅渗漏。

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来源期刊

Water and Environment Journal 环境科学-湖沼学

CiteScore

4.80

自引率

0.00%

发文量

审稿时长

18-36 weeks

期刊介绍： Water and Environment Journal is an internationally recognised peer reviewed Journal for the dissemination of innovations and solutions focussed on enhancing water management best practice. Water and Environment Journal is available to over 12,000 institutions with a further 7,000 copies physically distributed to the Chartered Institution of Water and Environmental Management (CIWEM) membership, comprised of environment sector professionals based across the value chain (utilities, consultancy, technology suppliers, regulators, government and NGOs). As such, the journal provides a conduit between academics and practitioners. We therefore particularly encourage contributions focussed at the interface between academia and industry, which deliver industrially impactful applied research underpinned by scientific evidence. We are keen to attract papers on a broad range of subjects including: -Water and wastewater treatment for agricultural, municipal and industrial applications -Sludge treatment including processing, storage and management -Water recycling -Urban and stormwater management -Integrated water management strategies -Water infrastructure and distribution -Climate change mitigation including management of impacts on agriculture, urban areas and infrastructure