Impact of Roots on Hydrogeological Parameters Supporting the Performance of a Cover with Capillary Barrier Effects
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 147, Issue 8
Abstract
One of the main environmental risks related to the surface storage of reactive mine tailings is acid mine drainage (AMD). AMD generation is often managed by limiting oxygen access to the reactive tailings. To do so, engineered cover systems such as covers with a capillary barrier effect (CCBEs) can be used. Over time, plants may colonize CCBE materials as a result of natural or assisted processes. Plant roots can have an impact on the hydrogeological properties that govern the performance of a CCBE, including saturated hydraulic conductivity () and water retention curves (WRCs). In the present work, flexible wall permeameters and water retention tests were used to characterize the moisture-retaining layer (MRL) of a CCBE colonized by roots. The obtained hydrogeological properties were compared with root colonization measurements using two-dimensional (2D) and three-dimensional (3D) root trait analysis techniques. Results showed that coarser root (diameter ) length density had a positive linear correlation with and that, as total root length density (RLD) increased, air entry values dropped (). Desorption rates were also shown to decrease with increasing RLD. Although these results suggest that the hydrogeological properties of the studied MRL were not significantly affected by roots seventeen years after construction, they also suggest that, with time, roots could eventually have a negative impact on a CCBE’s performance, and that further research is needed.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors thank the industrial partners of the Research Institute on Mines and the Environment (RIME UQAT-Polytechnique; www.RIME-IRME.ca) for providing funding for this project. The authors also acknowledge the financial support of the Fonds de Recherche du Québec sur la Nature et les Technologies (FRQNT): sustainable development of the mining sector program. Finally, the authors thank the Ministère de l’Énergie et des Ressources naturelles du Québec for granting access to the Lorraine mine site. The authors would like to thank also the Unité de recherche et service en technologie minérale (URSTM staff) and Gary Schudel for his help with the manuscript.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 147 • Issue 8 • August 2021
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© 2021 American Society of Civil Engineers.
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Received: May 12, 2020
Accepted: Mar 16, 2021
Published online: Jun 2, 2021
Published in print: Aug 1, 2021
Discussion open until: Nov 2, 2021
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