Evolution of a lakebed resulting from subaqueous tailings discharge: Coupling multibeam surveys and airborne LiDAR

CIM Journal, Vol. 5, No. 2, 2014

D. Turmel and J. Locat
Laboratoire d’études sur les risques naturels, Département de géologie et de génie géologique, Université Laval, Québec City, Quebec, Canada

G. Parker
Ven Te Chow Hydrosystems Lab, Department of Civil & Environmental Engineering and Department of Geology, University of Illinois at Urbana-Champaign, Illinois, USA

Depuis 1964, la Compagnie minière IOC a déposé des résidus de minerai de fer dans le lac Wabush, situé dans l’ouest du Labrador, Canada. De 1999 à 2008, la compagnie a entrepris des relevés bathymétriques multifaisceaux, des campagnes d’échantillonnage et un relevé LiDAR aéroporté. Nous avons intégré ces données afin d’étudier l’évolution de la ligne de rive du delta formé par les résidus et l’élévation du fond du lac. Les chenaux subaquatiques ont évolué entre les relevés, influençant le patron de distribution des résidus. Avec la présente analyse, nous pouvons évaluer l’effet des stratégies de déposition sur la couche sommitale du delta et l’accumulation des résidus. Ce projet joint, de manière unique, des techniques marines et terrestres pour suivre le sort des résidus dans un système de dispersion.
Mots clés : Gestion des résidus, disposition subaquatique, multifaisceaux, LiDAR
Résumé Depuis 1964, la Compagnie minière IOC a déposé des résidus de minerai de fer dans le lac Wabush, situé dans l’ouest du Labrador, Canada. De 1999 à 2008, la compagnie a entrepris des relevés bathymétriques multifaisceaux, des campagnes d’échantillonnage et un relevé LiDAR aéroporté. Nous avons intégré ces données afin d’étudier l’évolution de la ligne de rive du delta formé par les résidus et l’élévation du fond du lac. Les chenaux subaquatiques ont évolué entre les relevés, influençant le patron de distribution des résidus. Avec la présente analyse, nous pouvons évaluer l’effet des stratégies de déposition sur la couche sommitale du delta et l’accumulation des résidus. Ce projet joint, de manière unique, des techniques marines et terrestres pour suivre le sort des résidus dans un système de dispersion.
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