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INFLUENCE OF EXTREME EVENTS AND HYDROGEOLOGICAL PROPERTIES ON THE RELEASE CAPACITY OF STORE-AND-RELEASE COVERS IN A SEMIARID CLIMATE
Session: Contamined Sites and Remediation / Sités contaminés et réhabilitation
Bruno Bossé, IRME-UQAT (Canada)
Bruno Bussière, IRME-UQAT (Canada)
Abdelkabir Maqsoud, IRME-UQAT (Canada)
Rachid Hakkou, Faculté des Sciences et Techniques, Université Cadi Ayyad (Maroc)
Mostafa Benzaazoua, IRME-UQAT (Canada)
The transient unsaturated hydrogeological behaviour of four store-and-release (SR) cover systems made with different fine-grained materials was simulated using the HYDRUS-1D code under extreme rainfall conditions typical of a semiarid climate. Numerical predictions indicated higher release rates for coarser SR materials (0.3 mm/d), whereas finer SR materials (0.03 mm/d) accumulated water above the interface of the cover systems and did not prevent water percolation with the reactive mine wastes under consecutive extreme rainfall events. Coarser SR materials (i.e., silty sands), which recover their full storage capacity more rapidly, proved more suitable to ensure the long-term performance of these systems under natural and extreme climatic conditions. The surface evaporative fluxes, the thickness of the SR layer and the hydrogeological properties of the fine-grained material are the main parameters that affect the release capacity of such cover systems.
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