Effects of Parameter Variations Generated by Pumping on LNAPL Migration in the Aquitard: An Analytical and Experimental Study.

IF 3.9 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Toxics Pub Date : 2025-06-02 DOI:10.3390/toxics13060471

Yue Su, Yong Huang, Huan Shen, Xiaosong Dong, Xiaochang Sun, Zhimin Fu

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引用次数: 0

Abstract

The parameter variations in the aquitard have an important influence on the migration laws of contaminants in the aquitard. In order to study the influence of dynamic changes in parameters during pumping on the migration laws of Light Non-aqueous Phase Liquid (LNAPL) in the aquitard, the one-dimensional consolidation and groundwater flow equations for the aquitard were employed to derive the governing equations for the migration of LNAPL in the aquitard. A self-designed experimental platform was developed to investigate the effects of the pore water pressure, consolidation deformation, and pumping rate on LNAPL migration during pumping. The laboratory experimental results indicated that during pumping, the migration behavior of LNAPL in the aquitard typically exhibited a trend toward the pumping well and the overlying aquifer. The closer to the pumping well, the greater the change in the pore water pressure, the greater the amount of consolidation deformation, the earlier the state of densification, and the slower the migration rate of LNAPL in the aquitard. The nearer to the bottom of the aquitard, the larger the amount of consolidation deformation in the aquitard and the slower the migration rate of LNAPL in the aquitard. Also, the pumping rate had an important influence on groundwater flow movement and contaminant migration. The characteristics of parameter variations in the aquitard and laws of LNAPL migration during pumping were systematically studied and analyzed; these research results can provide a reference for the prediction and remediation of LNAPL in contaminated sites.

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抽水参数变化对水中LNAPL运移影响的分析与实验研究。

含水层参数的变化对含水层中污染物的运移规律有重要影响。为了研究抽水过程中参数的动态变化对轻非水相液体（LNAPL）在含水层内运移规律的影响，利用含水层的一维固结方程和地下水流动方程，推导了轻非水相液体在含水层内运移的控制方程。自行设计实验平台，研究了孔隙水压力、固结变形和泵送速率对泵送过程中LNAPL迁移的影响。室内实验结果表明，在抽水过程中，LNAPL在含水层内的运移行为典型地呈现向抽水井和上覆含水层运移的趋势。越靠近抽水井，孔隙水压力变化越大，固结变形量越大，致密化状态越早，LNAPL在含水层中的迁移速度越慢。越靠近含水层底部，含水层内固结变形量越大，LNAPL在含水层内的迁移速度越慢。抽水速率对地下水流动和污染物迁移也有重要影响。系统地研究和分析了抽水过程中水通道参数变化特征和LNAPL运移规律；研究结果可为污染场地LNAPL的预测和修复提供参考。

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

Toxics Chemical Engineering-Chemical Health and Safety

CiteScore

4.50

自引率

10.90%

发文量

681

审稿时长

6 weeks

期刊介绍： Toxics (ISSN 2305-6304) is an international, peer-reviewed, open access journal which provides an advanced forum for studies related to all aspects of toxic chemicals and materials. It publishes reviews, regular research papers, and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in detail. There is, therefore, no restriction on the maximum length of the papers, although authors should write their papers in a clear and concise way. The full experimental details must be provided so that the results can be reproduced. Electronic files or software regarding the full details of calculations and experimental procedure can be deposited as supplementary material, if it is not possible to publish them along with the text.