Advanced characterization and monitoring for improved wellhead protection in a fractured and porous dolostone bedrock aquifer

先进的表征和监测可改善裂隙和多孔白云岩基岩含水层的井口保护

• 批准号: 489241-2015
• 负责人: Parker, Beth
• 金额: $ 0.64万
• 依托单位: University of Guelph
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=674610
• 关键词: Advanced; characterization; monitoring; improved; wellhead

In southern Ontario, the Silurian dolostone belt extending from the Niagara escarpment to Bruce County is a major bedrock aquifer supplying approximately 1 million people with drinking water in large (Guelph, Cambridge) and small (Fergus, Orangeville) communities. The City of Guelph wellfield comprises 23 municipal pumping wells that supply the city with potable water. Two of the wells are threatened by the occurrence of trichloroethene (TCE) a former industrial solvent and a human carcinogen. While the levels of TCE meet drinking water guidelines, it is not known how the concentrations of TCE will be affected by long term pumping, changing rates of pumping, seasonal variations in recharge, impacts from pumping of other wells in the area, and chemical processes within the aquifer. Understanding these interrelated impacts are critical to the City's long term management of secure and sustainable potable groundwater supplies. The proposed research will integrate high resolution field and laboratory characterization and monitoring techniques developed and refined by Dr Beth Parker at the University of Guelph and referred to as the DFN field approach and DFN numerical modelling techniques. The DFN field approach utilizes multiple lines of evidence including: rock coring, physical and chemical testing of the core, installation of borehole liners, hydraulic and hydrophysical testing of the open and lined borehole, installation of borehole liners, installation of multilevel groundwater monitoring systems, physical and chemical testing of the multilevel systems and modelling of the groundwater flow system and contaminant fate and transport. The novel aspects of this research include a "smart" prototype multilevel groundwater monitoring system, development of 3-D capture zone model and improved methodology for designing a sentry well monitoring program. The results of the research will generate more certainty about TCE contaminant behaviour in the Guelph aquifer system, provide groundwater communities with scientific-based, defensible policies for managing secure potable water supplies sustainably and improve the knowledge base and best practice methods of the Canadian groundwater industry.

在安大略省南部，从尼亚加拉悬崖延伸至布鲁斯县的志留纪白云岩带是一个主要基岩含水层，为大型社区（圭尔夫、剑桥）和小型社区（弗格斯、奥兰治维尔）约 100 万人提供饮用水。圭尔夫市井田由 23 口市政抽水井组成，为该市提供饮用水。其中两口井受到三氯乙烯（TCE）的威胁，三氯乙烯（TCE）是一种前工业溶剂，也是一种人类致癌物。 虽然 TCE 的水平符合饮用水准则，但尚不清楚长期抽水、抽水速率变化、补给季节变化、该地区其他井抽水的影响以及化学过程将如何影响 TCE 的浓度含水层内。了解这些相互关联的影响对于该市安全和可持续饮用水地下水供应的长期管理至关重要。拟议的研究将整合圭尔夫大学 Beth Parker 博士开发和完善的高分辨率现场和实验室表征及监测技术，称为 DFN 现场方法和 DFN 数值建模技术。 DFN 现场方法利用多种证据，包括：岩石取芯、岩心的物理和化学测试、钻孔衬管的安装、开放和衬里钻孔的水力和水文物理测试、钻孔衬管的安装、多层地下水监测系统的安装、多级系统的物理和化学测试以及地下水流系统和污染物归宿和迁移的建模。这项研究的新颖之处包括“智能”原型多层地下水监测系统、3D捕获区模型的开发以及哨兵井监测程序设计的改进方法。研究结果将为圭尔夫含水层系统中的 TCE 污染物行为提供更多确定性，为地下水社区提供基于科学的、可辩护的政策，以可持续地管理安全饮用水供应，并改善加拿大地下水行业的知识库和最佳实践方法。