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Effect of an extreme flood event on solute transport and resilience of a mine water treatment system in a mineralised catchment

Mayes, W. M.; Perks, M. T.; Large, A. R.G.; Davis, J. E.; Gandy, C. J.; Orme, P. A.H.; Jarvis, A. P.

Authors

M. T. Perks

A. R.G. Large

J. E. Davis

C. J. Gandy

P. A.H. Orme

A. P. Jarvis



Abstract

Extreme rainfall events are predicted to become more frequent with climate change and can have a major bearing on instream solute and pollutant transport in mineralised catchments. The Coledale Beck catchment in north-west England was subject to an extreme rainfall event in December 2015 that equated to a 1 in 200-year event. The catchment contains the UK's first passive metal mine water treatment system, and as such had been subject to intense monitoring of solute dynamics before and after commissioning. Due to this monitoring record, the site provides a unique opportunity to assess the effects of a major storm event on (1) catchment-scale solute transport, and (2) the resilience of the new and novel passive treatment system to extreme events. Monitoring suggests a modest decline in treatment efficiency over time that is not synchronous with the storm event and explained instead by changes in system hydraulic efficiency. There was no apparent flushing of the mine system during the event that could potentially have compromised treatment system performance. Analysis of metal transport in the catchment downstream of the mine suggests relatively subtle changes in instream chemistry with modest but statistically-significant reductions in zinc in the lower catchment irrespective of flow condition after the extreme event, but most parameters of interest show no significant change. Increased export of colloidal iron and aluminium is associated with major landslips in the mid-catchment after the storm and provide fresh sorption sites to attenuate dissolved zinc more rapidly in these locations, corroborated by laboratory experiments utilising site materials to investigate the attenuation/release of metals from stream and terrestrial sediments. The data are important as they show both the resilience of passive mine water treatment systems to extreme events and the importance of catchment-scale monitoring to ensure continued effectiveness of treatment initiatives after major perturbation.

Journal Article Type Article
Publication Date Jan 1, 2021
Journal Science of the Total Environment
Print ISSN 0048-9697
Electronic ISSN 1879-1026
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 750
Article Number 141693
APA6 Citation Mayes, W. M., Perks, M. T., Large, A. R., Davis, J. E., Gandy, C. J., Orme, P. A., & Jarvis, A. P. (2021). Effect of an extreme flood event on solute transport and resilience of a mine water treatment system in a mineralised catchment. The Science of the total environment, 750, https://doi.org/10.1016/j.scitotenv.2020.141693
DOI https://doi.org/10.1016/j.scitotenv.2020.141693
Keywords Mine remediation; Climate extremes; Climate change; Mine drainage
Publisher URL https://www.sciencedirect.com/science/article/pii/S0048969720352220?via%3Dihub

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Copyright Statement
© 2020 Published by Elsevier.


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Copyright Statement
© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).





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