利用数值建模优化井场,尽量减少污染物从地表含水层向半封闭含水层的迁移

IF 2.6 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL Journal of The American Water Resources Association Pub Date : 2023-08-03 DOI:10.1111/1752-1688.13150
Sondipon Paul, Brian Waldron, Farhad Jazaei, Daniel Larsen
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引用次数: 0

摘要

浅层含水层、孟菲斯含水层和皮洛堡含水层是田纳西州孟菲斯市地下的三大含水层,其中孟菲斯含水层是主要的地下水源。上克莱伯恩承压单元 (UCCU) 分隔了谢尔比县大部分地区的浅层含水层和孟菲斯含水层,是孟菲斯含水层的上保护层。然而,UCCU 内的水文地质破损造成了水力连接,为污染物从浅层向孟菲斯含水层的潜在迁移提供了途径。这项研究旨在最大限度地减少污染物迁移,降低风险,延长可能面临水污染的现有水井的寿命,并为未来的水井建设寻找合适的地点。针对水井深度、季节性水井运行以及绘制禁钻区或红色区域图等问题制定了若干策略,以提供切实可行的解决方案。为每种策略开发了一种地下水数值建模技术,其中包括随机模拟优化和根据策略定制的模拟模型。这些模型对每种方案进行了数千次数值模拟,以确定污染物进入和通过孟菲斯含水层的循环模式。结果表明,最佳井位(空间和垂直方向)和抽水方式的改变可以延长井场的预期寿命,对孟菲斯含水层进行可持续管理,并减少污染物迁移至 2050 年。
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Wellfield optimization to minimize contaminant migration from a surficial to a semi-confined aquifer using numerical modeling

The shallow, Memphis, and Fort Pillow aquifers are the three major water-bearing strata beneath Memphis, Tennessee, where the Memphis aquifer serves as the primary groundwater source. The upper Claiborne confining unit (UCCU) separates shallow and Memphis aquifers across the majority of Shelby County, acting as an upper protective layer for the Memphis aquifer. However, hydrogeologic breaches within the UCCU create a hydraulic connection and provide an avenue for potential contaminant migration from the shallow to the Memphis aquifer. This research aims to minimize contaminant migration, mitigate risks, extend existing wells' life that may face water contamination, and find suitable locations for future well construction. Several strategies are developed addressing well depth, seasonal well operation, and mapping no-drilling or red zones to provide practical solutions. A numerical groundwater modeling technique is developed for each strategy that includes stochastic simulation–optimization and customized simulation models depending on the strategy. The models result in thousands of numerical simulations for each scenario to identify recurring patterns of contaminant movement to and through the Memphis aquifer. The results indicate that optimum well positions (spatially and vertically) and modification to pumping can increase the life expectancy of wellfields, offer sustainable management of the Memphis aquifer, and reduce contaminant migration through 2050.

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来源期刊
Journal of The American Water Resources Association
Journal of The American Water Resources Association 环境科学-地球科学综合
CiteScore
4.10
自引率
12.50%
发文量
100
审稿时长
3 months
期刊介绍: JAWRA seeks to be the preeminent scholarly publication on multidisciplinary water resources issues. JAWRA papers present ideas derived from multiple disciplines woven together to give insight into a critical water issue, or are based primarily upon a single discipline with important applications to other disciplines. Papers often cover the topics of recent AWRA conferences such as riparian ecology, geographic information systems, adaptive management, and water policy. JAWRA authors present work within their disciplinary fields to a broader audience. Our Associate Editors and reviewers reflect this diversity to ensure a knowledgeable and fair review of a broad range of topics. We particularly encourage submissions of papers which impart a ''take home message'' our readers can use.
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