浅层状含水层地下水位上升与溶质羽流形成关系的模型分析

Simone Varisco, G. Beretta, L. Raffaelli, Paola Raimondi, D. Pedretti
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引用次数: 1

摘要

地下水位上升(GTR)是一个众所周知的问题,影响着世界上一些城市和农业地区。这项工作解决了GTR和溶质羽流的形成之间的联系,这些羽流来自位于渗透带的污染源,并且随着时间的推移,地下水位的上升可能有助于动员。以意大利那不勒斯附近的层状火山碎屑冲积含水层为例进行了分析,该含水层受GTR的影响非常严重。一家废弃的化工厂产生了溶质羽流,该羽流由泵和处理(P&T)系统进行水力限制。自2011年以来,在监测井中发现1,1-二氯乙烯(1,1- dce)的水溶液浓度超过了规定的最大浓度水平。据推测,1,1- dce源可能作为在GTR下随时间冲洗的掩埋废物出现。为了阐明这一假设并对P&T系统进行再优化,利用特定场地的数据进行了流动和输运数值模拟分析。结果表明,所提出的假设确实是合理的。模型显示,2011年和2017年达到了地下水位峰值,这与现场观测到的1,1- dce浓度峰值一致。该模型还能够捕捉到2011年至2014年间地下水位和浓度同时下降的情况。基于场景的分析表明,将地下水位降低到假设水源的海拔以下,可能是重新安排P&T系统抽水速率的一种经济有效的策略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Model-Based Analysis of the Link between Groundwater Table Rising and the Formation of Solute Plumes in a Shallow Stratified Aquifer
Groundwater table rising (GTR) represents a well-known issue that affects several urban and agricultural areas of the world. This work addresses the link between GTR and the formation of solute plumes from contaminant sources that are located in the vadose zone, and that water table rising may help mobilize with time. A case study is analyzed in the stratified pyroclastic-alluvial aquifer near Naples (Italy), which is notoriously affected by GTR. A dismissed chemical factory generated a solute plume, which was hydraulically confined by a pump-and-treat (P&T) system. Since 2011, aqueous concentrations of 1,1-dichloroethene (1,1-DCE) have been found to exceed regulatory maximum concentration levels in monitoring wells. It has been hypothesized that a 1,1-DCE source may occur as buried waste that has been flushed with time under GTR. To elucidate this hypothesis and reoptimize the P&T system, flow and transport numerical modeling analysis was developed using site-specific data. The results indicated that the formulated hypothesis is indeed plausible. The model shows that water table peaks were reached in 2011 and 2017, which agree with the 1,1-DCE concentration peaks observed in the site. The model was also able to capture the simultaneous decrease in the water table levels and concentrations between 2011 and 2014. Scenario-based analysis suggests that lowering the water table below the elevation of the hypothesized source is potentially a cost-effective strategy to reschedule the pumping rates of the P&T system.
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