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Groundwater flow velocities in karst aquifers; importance of spatial observation scale and hydraulic testing for contaminant transport prediction

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Abstract

We review scale dependence of hydraulic conductivities and effective porosities for prediction of contaminant transport in four UK karst aquifers. Approaches for obtaining hydraulic parameters include core plug, slug, pumping and pulse tests, calibration of groundwater flow models and spring recession curves. Core plug and slug tests are unsuitable because they do not characterize a large enough volume to include a representative fracture network. Pumping test values match regional-scale hydraulic conductivities from flow modelling for the less intensively karstified aquifers: Magnesian Limestone, Jurassic Limestone and Cretaceous Chalks. Reliable bulk hydraulic conductivities were not available for the intensively karstified Carboniferous Limestone due to dominance of flow through pipe conduits in Mendips. Here, the only hydraulic conductivity value found from spring recession is one order of magnitude higher than that indicated by pumping tests. For all four carbonate aquifers, effective porosities assumed for transport modelling are two orders of magnitude higher than those found from tracer and hydrogeophysical tests. Thus, a combination of low hydraulic conductivities and assumed flowing porosities resulted in underestimated flow velocities. The UK karst aquifers are characterized by a range of hydraulic behaviours that fit those of karst aquifers worldwide. Indeed, underestimation of flow velocity due to inappropriate parameter selection is common to intensively karstified aquifers of southern France, north-western Germany and Italy. Similar issues arise for the Canadian Silurian carbonates where the use of high effective porosities (e.g. 5%) in transport models leads to underestimation of groundwater velocities. We recommend values in the range of 0.01–1% for such aquifers.

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Acknowledgements

The authors thank the research colleagues of the University of Leeds (UK) that contributed to advance knowledge of the UK karst aquifers over the years. Noelle Odling and Simon Bottrell are thanked for the interesting discussions on the four karst aquifers of Great Britain. Steven Banwart is thanked for funding recent published research that provided data for this review on the Magnesian Limestone aquifer. Neil Gunn (Atkins) and Daniele Coltellacci (Sapienza University of Rome) provided assistance on finding outcrop images and relevant papers, respectively. Critical discussions on the carbonate aquifers of Italy, France and Canada with Marco Petitta (Sapienza University of Rome), Hervé Jourde (Université de Montpellier) and Beth Parker (University of Guelph) were also appreciated. Nico Goldscheider (Karlsruhe Institute of Technology) has kindly provided the global map of karst aquifers. Finally, the manuscript benefitted from constructive review comments of two anonymous reviewers and Editor, Xianliang Yi (Nanjing University).

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  1. G360 Institute of Groundwater Research, University of Guelph, Stone Road, Guelph, Ontario, N1G 2W1, Canada

    Giacomo Medici

  2. School of Earth and Environment, University of Leeds, Woodhouse Lane, Leeds, W Yorkshire, LS2 9JT, UK

    Landis Jared West

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Giacomo Medici, conceptualization, data curation, and writing; Jared West, supervision and conceptualization

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Medici, G., West, L.J. Groundwater flow velocities in karst aquifers; importance of spatial observation scale and hydraulic testing for contaminant transport prediction. Environ Sci Pollut Res 28, 43050–43063 (2021). https://doi.org/10.1007/s11356-021-14840-3

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