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Discussion on ‘Borehole temperature log from the Glasgow Geothermal Energy Research Field Site: a record of past changes to ground surface temperature caused by urban development’, Scottish Journal of Geology, 56, 134-152, https://doi.org/10.1144/sjg2019-033

View ORCID ProfileAlison A. Monaghan, View ORCID ProfileDavid A.C. Manning and View ORCID ProfileZoe K. Shipton
Scottish Journal of Geology, 57, sjg2020-014, 12 January 2021, https://doi.org/10.1144/sjg2020-014
Alison A. Monaghan
1British Geological Survey, Lyell Centre, Research Avenue South, Edinburgh EH14 4AP, UK
Roles: [Writing – original draft (Lead)]
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  • For correspondence: [email protected]
David A.C. Manning
2School of Natural & Environmental Sciences, Newcastle University, Drummond Building, Newcastle upon Tyne NE1 7RU, UK
Roles: [Writing – review & editing (Equal)]
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Zoe K. Shipton
3Civil and Environmental Engineering, University of Strathclyde, James Weir Building, 75 Montrose Street, Glasgow G1 1XJ, UK
Roles: [Writing – review & editing (Equal)]
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In their analysis of temperature data, Watson and Westaway (2020) make substantial use of initial open information provided by the UK Geoenergy Observatory: Glasgow Geothermal Energy Research Field Site. They also offer criticisms on site location, heat resource size, design and costs; however, these criticisms appear to be based on a misunderstanding of the purpose of the Glasgow Observatory. In order to mitigate misapprehensions for future Observatory users, we write in reply. The Glasgow Observatory has been developed as a multidisciplinary research facility; it is not a demonstrator of maximum mine water heat resource, which is by implication what Watson and Westaway (2020) would deem a success.

Location

The focus of the UK Geoenergy Observatory in Glasgow is research infrastructure for very low enthalpy mine water geothermal and heat storage in an urban area with a complex prior land use (Monaghan et al. 2017, 2019). Due to open in 2020, researchers will have access to boreholes fitted with state-of-the-art instrumentation, as well as having the opportunity to deploy and test their own equipment. Data collected during construction and an ongoing baseline from borehole and surface instruments are, and will be, freely available on the ukgeos.ac.uk data portal.

The location in the east end of Glasgow was chosen by a Science Advisory Group and NERC Project Board, with the British Geological Survey (BGS) tasked to deliver and operate this NERC facility. An important consideration was that the area is representative of towns and cities across the UK for which mine energy could form a resource for heat abstraction and storage, with the challenges of an urban area close to heat demand, a complex prior land use, limited land availability and relatively shallow mine workings. Monaghan et al. (2017, p.11) summarize that this ‘forms a realistic exemplar for study as a subsurface monitoring laboratory’, which includes ‘understanding of low-temperature heat resources balanced with their impacts on people and the subsurface–surface environment’ (Adams et al. 2019). The wider area also benefited from previous data from the Clyde Urban SuperProject, providing regional characterization to a greater level of detail than is typical, making it an ideal platform for conducting research.

Resource size and cost

In their discussion section, Watson and Westaway (2020, p. 149) estimate the mine water heat resource size at the Glasgow Observatory, noting that ‘detailed calculations depend on the hydrology, which has not yet been determined’, stating that the resource available is quite small.

The Observatory is intentionally designed at the scale of a small, low temperature mine water scheme. The borehole spacing has been designed to provide data and imaging of induced changes (Monaghan et al. 2019, mine water borehole overview p. 10) on measurable time-scales for research monitoring, as opposed to at a scale for maximum mine water heat abstraction. For example, for research around resource sustainability, heat dispersion and thermal breakthrough processes under different conditions, the borehole spacing and design will provide flexibility that would not be possible in schemes designed to supply heat users.

Watson and Westaway (2020) then use the resource size in a cost comparison with other energy types (gas) in relation to the cost of the Observatory. This comparison is misleading: the £9 million cost of the Observatory is not representative of a commercial mine water heat scheme as it includes boreholes with two types of downhole sensor cable, environmental baseline monitoring boreholes, a range of surface monitoring equipment, surface research compounds designed for 15-year lifespan by a wide range of researchers and planning permission for those, an open data portal and associated IT infrastructure, core scans and production of open datasets for research community use (infrastructure described in Monaghan et al. 2019). This infrastructure would not be justified for a system intended to solely deliver heat. Additionally, planning permission was granted on the basis that the Glasgow Observatory is a research site. During communication with local communities and businesses it has been made clear it is not a heat supply scheme.

Borehole depth

In the discussion section, Watson and Westaway (2020) give a critique of the depth of borehole GGC01 drilled in 2018, in relation to gathering of thermal data. The Glasgow Observatory aims to enable a multiplicity of disciplines, including geothermics, and being inevitably constrained within a cost and time-scale, many trade-offs and balances were required in the design. In this case, GGC01 was drilled to 199 m, as boreholes >200 m deep require additional planning and environmental permitting at additional cost and time-scale. This borehole provided a cored reference section, preserved geomicrobiology and drilling samples (e.g. used in Chambers et al. 2019; Walls et al. 2020), downhole logs and hosts a string of 5 broadband seismometers (e.g. used to observe seismic ‘quietening’ due to Covid-19: Hicks 2020; Lecocq et al. 2020).

Groundwater flow and prior land use

In the discussion section, Watson and Westaway (2020, p.148) state ‘the possibility of changes to the pattern of groundwater flow, resulting from GGERFS activities such as well testing and possible future heat production, a significant issue’ in relation to prior land contamination in the Dalmarnock–Shawfield area (250–500 m from the site of GGC01). An increased evidence base on shallow groundwater flow systems and deeper mine water schemes is certainly a topic for research in areas with complex prior land use, it is important to note:

  • GGC01 at Dalmarnock is the seismic monitoring borehole. It was fully cased on completion, and no pumping is planned for this borehole (Kearsey et al. 2019). GGERFS mine water boreholes are located at Cuningar Loop 1.4 km to the east (Monaghan et al. 2020).

  • Boreholes at Cuningar Loop are arranged in spatial and depth arrays including in the near top bedrock and superficial deposits precisely to monitor and provide the evidence base for natural and induced changes from the subsurface to surface environment. A vital part of the Glasgow Observatory is providing open data and infrastructure to assess potential environmental impacts from mine water abstraction on the shallower bedrock, superficial deposits and human-made ground (Adams et al. 2019; Monaghan et al. 2019).

  • Land contamination is highly variable and site specific – various programmes of remediation are ongoing during urban regeneration including at Dalmarnock and Shawfield.

Conclusion

In conclusion, Watson and Westaway (2020) make full use of the initial open datasets provided by the UK Geoenergy Observatory in Glasgow, exemplifying the value of such an at-scale Observatory in a representative urban setting. The Observatory is not a demonstrator for the maximum abstraction and supply of heat. Rather it is research infrastructure to support the evidence-base, development of processes and innovation around mine water energy resources and environmental management. In this reply we hope to have corrected the misleading comments in Watson and Westaway (2020) and we look forward to welcoming future Observatory users to run experiments, test equipment and protocols and take advantage of the open-access data portal.

Author contributions:

AAM: writing – original draft (lead); DACM: writing – review & editing (equal); ZKS: writing – review & editing (equal)

Funding

This work was funded by the Natural Environment Research Council. AAM is employed by the British Geological Survey as Science Lead for the Glasgow Observatory. DACM is Natural Environment Research Council (NERC) Senior Science User for the UK Geoenergy Observatories. ZKS is voluntary Chair of the UK Geoenergy Observatories Science Advisory Group.

Data availability

UK Geoenergy Observatories data referred to in the original article and this reply are openly available at www.ukgeos.ac.uk

Scientific editing by Heather Stewart

  • © 2021 UKRI. The British Geological Survey. Published by The Geological Society of London for EGS and GSG.
http://creativecommons.org/licenses/by/4.0/

This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 License (http://creativecommons.org/licenses/by/4.0/)

References

  1. ↵
    1. Adams, C.,
    2. Monaghan, A.
    and Gluyas, J. 2019. Mining for heat. Geoscientist, 29, 10–15, https://doi.org/10.1144/geosci2019-021
    OpenUrl
  2. ↵
    1. Chambers, R.,
    2. Gilfillan, S.,
    3. Johnson, G.
    and Boyce, A. 2019. Investigations into geochemical fingerprints of UK carboniferous coal measures at the Glasgow UKGEOS Site, Scotland. AGU Fall Meeting Abstracts, https://agu.confex.com/agu/fm19/meetingapp.cgi/Paper/501386
  3. ↵
    1. Hicks, S.
    2020. Reduction in seismic noise from Covid-19 lockdown cuts deep’ Twitter post using Glasgow Observatory data, https://twitter.com/seismo_steve/status/1257342761948319746
  4. ↵
    1. Kearsey, T.,
    2. Gillespie, M. et al.
    2019. UK Geoenergy Observatories Glasgow: GGC01 cored, seismic monitoring borehole – intermediate data release. British Geological Survey, Nottingham, UK, Open Report, OR/19/049, 36, http://nora.nerc.ac.uk/id/eprint/525009/
  5. ↵
    1. Lecocq, T., Hicks, S.P. et al.
    2020. Global quieting of high-frequency seismic noise due to COVID-19 pandemic lockdown measures. Science, 369, 1338–1343, https://doi.org/10.1126/science.abd2438
    OpenUrlAbstract/FREE Full Text
  6. ↵
    1. Monaghan, A.A.,
    2. Ó Dochartaigh, B.E. et al.
    2017. UKGEOS: Glasgow Geothermal Energy Research Field Site (GGERFS): initial summary of the geological platform. British Geological Survey, Nottingham, UK, Open Report, OR/17/006, http://nora.nerc.ac.uk/id/eprint/518636/
  7. ↵
    1. Monaghan, A.A.,
    2. Starcher, V.,
    3. Ó Dochartaigh, B.E.,
    4. Shorter, K.M.
    and Burkin, J. 2019. UK Geoenergy Observatories: Glasgow Geothermal Energy Research Field Site: science infrastructure version 2. British Geological Survey, Nottingham, UK, Open Report, OR/19/032, http://nora.nerc.ac.uk/id/eprint/522814/
  8. ↵
    1. Monaghan, A.,
    2. Starcher, V.
    and Barron, H. 2020. UK Geoenergy Observatories Glasgow: express data release, mine water and environmental baseline monitoring boreholes at Cuningar Loop (updated June 2020). British Geological Survey, Nottingham, UK, OR/20/002, 17, http://nora.nerc.ac.uk/id/eprint/526889/
  9. ↵
    1. Walls, D.B.,
    2. Burnside, N.M.
    and Boyce, A.J. 2020. ‘Old versus New’: comparing mine water geothermal systems in Glasgow. Proceedings World Geothermal Congress 2020, https://pangea.stanford.edu/ERE/db/WGC/papers/WGC/2020/14148.pdf
  10. ↵
    1. Watson, S.M. and
    2. Westaway, R.
    2020. Borehole temperature log from the Glasgow Geothermal Energy Research Field Site: a record of past changes to ground surface temperature caused by urban development. Scottish Journal of Geology, 56, 134–152, https://doi.org/10.1144/sjg2019-033
    OpenUrlAbstract/FREE Full Text
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Discussion on ‘Borehole temperature log from the Glasgow Geothermal Energy Research Field Site: a record of past changes to ground surface temperature caused by urban development’, Scottish Journal of Geology, 56, 134-152, https://doi.org/10.1144/sjg2019-033

Alison A. Monaghan, David A.C. Manning and Zoe K. Shipton
Scottish Journal of Geology, 57, sjg2020-014, 12 January 2021, https://doi.org/10.1144/sjg2020-014
Alison A. Monaghan
1British Geological Survey, Lyell Centre, Research Avenue South, Edinburgh EH14 4AP, UK
Roles: [Writing – original draft (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Alison A. Monaghan
  • For correspondence: [email protected]
David A.C. Manning
2School of Natural & Environmental Sciences, Newcastle University, Drummond Building, Newcastle upon Tyne NE1 7RU, UK
Roles: [Writing – review & editing (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for David A.C. Manning
Zoe K. Shipton
3Civil and Environmental Engineering, University of Strathclyde, James Weir Building, 75 Montrose Street, Glasgow G1 1XJ, UK
Roles: [Writing – review & editing (Equal)]
  • Find this author on Google Scholar
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  • ORCID record for Zoe K. Shipton

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Discussion on ‘Borehole temperature log from the Glasgow Geothermal Energy Research Field Site: a record of past changes to ground surface temperature caused by urban development’, Scottish Journal of Geology, 56, 134-152, https://doi.org/10.1144/sjg2019-033

Alison A. Monaghan, David A.C. Manning and Zoe K. Shipton
Scottish Journal of Geology, 57, sjg2020-014, 12 January 2021, https://doi.org/10.1144/sjg2020-014
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