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Landslide susceptibility, hazard and risk assessments along pipeline corridors in Canada

A. Blais-Stevens, R. Couture, A. Page, J. Koch, J.J. Clague, P.S. Lipovsky

In the proceedings of: GEO2010 Calgary: 63rd Canadian Geotechnical Conference & 6th Canadian Permafrost Conference

Session: T3-A

ABSTRACT: Two large gas pipeline projects, Yukon Alaska Highway Pipeline and Mackenzie Gas Project Pipeline are under different stages of development in northern Canada. Both proposed pipeline routes cross rugged, harsh environments in permafrost terrain, therefore, may be at risk from natural hazards. Landslide inventory and hazard assessments are essential in qualifying or quantifying risk along linear infrastructure and in assessing environmental impacts. The Geological Survey of Canada has for several years contributed to hazard assessments by performing baseline geological regional studies. This paper presents the work that was carried out along two pipeline routes in northern regions. Both proposed routes are over 800 km-long. Landslide inventory and qualitative parametric landslide susceptibility maps were carried out for both, showing good correlations between landslide distribution and landslide susceptibility maps. In the Mackenzie Valley Pipeline Corridor, most landslides (99%) have occurred in fine unconsolidated sediments and shallow slopes. In the Yukon Alaska Highway Corridor, the majority has occurred in unconsolidated sediments (65%) but a few landslides (15%) have occurred in bedrock with high relief. Thus, our preliminary investigations indicate that there is a slope hazard in both corridors to be considered during pipeline development.

RÉSUMÉ: Deux projets de gazoducs au Nord-Ouest du Canada sont en différents stades de développement (Yukon et lvallée du Mackenzie). Les deux routes proposées traversent des environnements difficiles entourées de pergélisol. Par conséquent, elles peuvent être exposées aux risques naturels. L'inventaire des glissements de terrain et des évaluations de risque sont essentiels dans la qualification ou la quantification des risques le long des infrastructures linéaires. La Commission géologique du Canada, depuis plusieurs années, a contribué à l'évaluation des aléas géologiques en réalisant des études de bases régionales. Cet article présente les travaux menés le long de deux tracés. Les deux routes proposées sont plus de 800km de long. L'inventaire et les cartes de susceptibilité de glissement de terrain paramétriques réalisés montrent de bonnes corrélations entre distribution et cartes de susceptibilité de glissements de terrain. Dans la vallée du Mackenzie, les glissements de terrain (99%) ont eu lieu dans des sédiments fins non-consolidés en pentes douces. Au Yukon, la majorité a eu lieu dans des sédiments, mais certains ont eu lieu dans la roche en place en haut-relief. Nos investigations préliminaires indiquent qu'il y a danger de mouvements de terrain à prendre en considération lors du développement des pipelines.

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Cite this article:
A. Blais-Stevens; R. Couture; A. Page; J. Koch; J.J. Clague; P.S. Lipovsky (2010) Landslide susceptibility, hazard and risk assessments along pipeline corridors in Canada in GEO2010. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GEO2010_113, author = A. Blais-Stevens; R. Couture; A. Page; J. Koch; J.J. Clague; P.S. Lipovsky,
title = Landslide susceptibility, hazard and risk assessments along pipeline corridors in Canada,
year = 2010
}