De-risking green energy from mine waters by developing a robust hydrogeological conceptual model of the UK Geoenergy Observatory in Glasgow

IF 2.4 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Hydrogeology Journal Pub Date : 2024-06-19 DOI:10.1007/s10040-024-02778-y
Andres Gonzalez Quiros, Donald John MacAllister, Alan MacDonald, Barbara Palumbo-Roe, Jenny Bearcock, Brighid Ó Dochartaigh, Eileen Callaghan, Tim Kearsey, Kyle Walker-Verkuil, Alison Monaghan
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Abstract

Mine-water geothermal resources have potential to provide low-carbon heating and cooling in many areas; however, this potential has not been fully realised due to technical, economic and policy challenges. The UK Geoenergy Observatory (UKGEOS) in Glasgow was developed to provide an at-scale research facility designed to help de-risk mine-water geothermal usage. The limited knowledge of the hydrogeological systems altered by former mining activities is a key determinant of the long-term sustainability of water and heat abstraction/reinjection. This work presents a hydrogeological conceptual model developed using groundwater monitoring data obtained during the construction of the Observatory between 2020 and 2022, results from initial pumping tests performed in 2020, and results of hydrochemistry analysis from 25 sampling rounds collected between 2019 and 2022. The analysis of the data provides evidence of the dominant role of mine workings in controlling groundwater flow, with high intra-mine connectivity; increased fracturing in sandstones above mine workings; and limited inter-mine connectivity. Groundwater recharge is meteoric, mean residence times are >50 years, and there is a general upwards circulation from the deeper mine levels to the superficial deposits and the River Clyde. Faults play a significant role in limiting the extent of the highly transmissive mine workings, but there remains uncertainty surrounding the role of the faults in connecting different mine workings and their hydraulic behaviour in nonmined units. The conceptual model, that will be refined as new data become available, will be used to help guide monitoring and sampling programs and plan research activities in the Observatory.

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通过为格拉斯哥英国地质能源观测站开发一个强大的水文地质概念模型,降低矿井水绿色能源的风险
矿井水地热资源具有为许多地区提供低碳供暖和制冷的潜力;然而,由于技术、经济和政策方面的挑战,这一潜力尚未得到充分发挥。位于格拉斯哥的英国地质能源观测站(UKGEOS)旨在提供大规模的研究设施,帮助降低矿井水地热利用的风险。对以前采矿活动所改变的水文地质系统的了解有限,这是决定取水和取热/回注的长期可持续性的关键因素。这项工作介绍了一个水文地质概念模型,该模型是利用 2020 年至 2022 年观测站建设期间获得的地下水监测数据、2020 年进行的初步抽水测试结果以及 2019 年至 2022 年收集的 25 轮取样的水化学分析结果开发的。数据分析结果表明,矿井工作面在控制地下水流方面发挥着主导作用,矿井内部的连通性很高;矿井工作面上方砂岩的断裂增加;矿井之间的连通性有限。地下水补给为流体补给,平均滞留时间为 50 年,从较深的矿井水平面到浅层沉积物和克莱德河普遍呈上升循环。断层在限制高透水性矿坑范围方面发挥着重要作用,但断层在连接不同矿坑方面的作用及其在非矿坑单元中的水力行为仍存在不确定性。该概念模型将随着新数据的获得而不断完善,并将用于指导监测和取样计划以及规划观测站的研究活动。
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来源期刊
Hydrogeology Journal
Hydrogeology Journal 地学-地球科学综合
CiteScore
5.40
自引率
7.10%
发文量
128
审稿时长
6 months
期刊介绍: Hydrogeology Journal was founded in 1992 to foster understanding of hydrogeology; to describe worldwide progress in hydrogeology; and to provide an accessible forum for scientists, researchers, engineers, and practitioners in developing and industrialized countries. Since then, the journal has earned a large worldwide readership. Its peer-reviewed research articles integrate subsurface hydrology and geology with supporting disciplines: geochemistry, geophysics, geomorphology, geobiology, surface-water hydrology, tectonics, numerical modeling, economics, and sociology.
期刊最新文献
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