Digging deeper : the influence of historical mining on Glasgow's subsurface thermal state to inform geothermal research
Watson, Sean M. and Westaway, Rob and Burnside, Neil M. (2019) Digging deeper : the influence of historical mining on Glasgow's subsurface thermal state to inform geothermal research. Scottish Journal of Geology, 55 (2). pp. 107-123. ISSN 2041-4951 (https://doi.org/10.1144/sjg2019-012)
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Abstract
Studies of the former NE England coalfield in Tyneside demonstrated that heat flow perturbations in boreholes were due to the entrainment and lateral dispersion of heat from deeper in the subsurface through flooded mine workings. This work assesses the influence of historical mining on geothermal observations across Greater Glasgow. The regional heat flow for Glasgow is 60 mW m−2 and, after correction for palaeoclimate, is estimated as c. 80 mW m−2. An example of reduced heat flow above mine workings is observed at Hallside (c. 10 km SE of Glasgow), where the heat flow through a 352 m deep borehole is c. 14 mW m−2. Similarly, the heat flow across the 199 m deep GGC01 borehole in the Glasgow Geothermal Energy Research Field Site is c. 44 mW m−2. The differences between these values and the expected regional heat flow suggest a significant component of horizontal heat flow into surrounding flooded mine workings. This deduction also influences the quantification of deeper geothermal resources, as extrapolation of the temperature gradient above mine workings would underestimate the temperature at depth. Future projects should consider the influence of historical mining on heat flow when temperature datasets such as these are used in the design of geothermal developments.
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Item type: Article ID code: 75546 Dates: DateEvent19 November 2019Published26 September 2019AcceptedSubjects: Science > Geology Department: Faculty of Engineering > Civil and Environmental Engineering Depositing user: Pure Administrator Date deposited: 24 Feb 2021 16:22 Last modified: 14 Aug 2024 01:37 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/75546