Analyse du potentiel tsunamigénique des glissements de terrain possibles dans une ancienne mine à ciel ouvert à Black Lake, Québec

Authors: Leblanc, Jonathan
Advisor: Locat, Jacques
Abstract: As part of a research project entrusted by the Quebec Ministry of Transports consisting in a preliminary analysis of landslides induced by the mining operations and their potential consequences on the road and urban infrastructures of Black Lake, this Master’s project analyses the tsunamigenic potential of the east wall landslides of the abandoned mine LAB d’Amiante du Canada following the eventual reflooding of the open pit. In order to achieve this, the GeoClaw software, based on the Barré-de-Saint-Venant shallow water equations, has been used to model the tsunami formation. Given the fact that a landslide-generated tsunami could only happen in several years in Black Lake, the model was first validated by applying it to a recent case that occurred in 2014 at Lac-des-Seize-Îles in Quebec. Tsunami generation is not only a function of the affected water basin, but also of the volume and the displacement velocity of the mobilised mass. These parameters have been pre-determined before proceeding with the tsunamigenic potential analysis of possible landslides along the east wall. Given the inherent uncertainties associated with this kind of prospective analysis, the generation, propagation and flood modeling has been completed with a parametric approach, using scenarios established from a stability and kinetic analysis , and using a digital elevation model built from LiDAR surveys as input parameters. Furthermore, the effect of pit flooding induced by the mine shutdown has also been evaluated for the landslide scenarios. This work allowed identifying the minimal water level required in the open pit at which the road and urban infrastructures would be affected by the inundation and thus allowed estimating the potential consequences if a sudden acceleration of the landslide occurs and if a tsunami is generated. The main results show that if a landslide were to occur, three different landslide scenarios would be potentially more problematic in terms of inundation of the infrastructures. The main road infrastructure (i. e. Highway 112) would be potentially affected, with varying severity depending on the water level of the lake and the mobilization velocities of the landslides, while the urban infrastructure located in the Black Lake area would remain unaffected. Finally, this analysis has demonstrated the interest to extend the application of this method to other recent and historic landslide-induced tsunami cases in Quebec.
Document Type: Mémoire de maîtrise
Issue Date: 2016
Open Access Date: 11 April 2019
Grantor: Université Laval
Collection:Thèses et mémoires

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