Analytical solutions for 1-D transport of organic solutes in multi-layered porous media

IF 2.2 4区工程技术 Q3 ENGINEERING, GEOLOGICAL

Environmental geotechnics Pub Date : 2023-08-24 DOI:10.1680/jenge.22.00186

Wenhao Jiang, S. Ge, C. Feng, Jiang Li

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引用次数: 0

Abstract

In this study, the analytical solutions for one-dimensional (1-D) transport of organic solutes in multi-layered porous media are developed by the methods of matrix transfer and variable separation, where the multi-factors such as advection, diffusion, mechanical dispersion, adsorption, degradation, boundary condition type as well as the change of concentration are systematically incorporated for the first time. Compared with the existing analytical solutions solved by the techniques of integral transformation or Laplace transformation, the approaches adopted in this paper are simpler with quicker convergence speed. Also, the proposed analytical solutions are more practical with clear expressions and the consideration of the multi-factors, which can be applied to various engineering cases such as bottom liner system at landfills, covering system of contaminated sediments and vertical barrier system in contaminated sites. Furthermore, the correctness of the derived analytical solutions is effectively validated by comparison with the experimental results, the existing analytical solution and a numerical method. Following this, the effects of different factors on the transport process of a single organic solute in a five-layered media are investigated, and some novel and vital laws are obtained. Overall, this research contributes to appropriately evaluating the transport behaviors in multi-layered porous media.

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有机溶质在多层多孔介质中一维传输的解析解

本文首次系统地考虑了平流、扩散、机械分散、吸附、降解、边界条件类型以及浓度变化等多因素，采用基质转移和可变分离的方法，建立了有机溶质在多层多孔介质中的一维输运解析解。与现有的用积分变换或拉普拉斯变换的方法求解解析解相比，本文所采用的方法更简单，收敛速度更快。所提出的解析解表达清晰，考虑了多因素，更具有实用性，可适用于垃圾填埋场底垫系统、污染沉积物覆盖系统、污染场地垂直屏障系统等工程实例。通过与实验结果、已有解析解和数值方法的对比，有效验证了推导解析解的正确性。在此基础上，研究了不同因素对单一有机溶质在五层介质中的输运过程的影响，得到了一些新的重要规律。总体而言，本研究有助于合理评价多层多孔介质中的输运行为。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Environmental geotechnics Environmental Science-Water Science and Technology

CiteScore

6.20

自引率

18.20%

发文量

期刊介绍： In 21st century living, engineers and researchers need to deal with growing problems related to climate change, oil and water storage, handling, storage and disposal of toxic and hazardous wastes, remediation of contaminated sites, sustainable development and energy derived from the ground. Environmental Geotechnics aims to disseminate knowledge and provides a fresh perspective regarding the basic concepts, theory, techniques and field applicability of innovative testing and analysis methodologies and engineering practices in geoenvironmental engineering. The journal''s Editor in Chief is a Member of the Committee on Publication Ethics. All relevant papers are carefully considered, vetted by a distinguished team of international experts and rapidly published. Full research papers, short communications and comprehensive review articles are published under the following broad subject categories: geochemistry and geohydrology, soil and rock physics, biological processes in soil, soil-atmosphere interaction, electrical, electromagnetic and thermal characteristics of porous media, waste management, utilization of wastes, multiphase science, landslide wasting, soil and water conservation, sensor development and applications, the impact of climatic changes on geoenvironmental, geothermal/ground-source energy, carbon sequestration, oil and gas extraction techniques, uncertainty, reliability and risk, monitoring and forensic geotechnics.