| This research analyzes the Lesueur and Oldman landslide successions located on the right bank of the North Saskatchewan River in northeast Edmonton. This research reports four main studies of them.;The first study examines the effects of landuse changes on triggering the slope movements through aerial photo interpretation, spanning 45 years. The second identifies the geological structure of the mass comprising both successions. Another study is the slope movement monitoring which has been carried out through different methods such as control surveying and mensuration. The final study consists of the ground surveys of the geometrical properties of 14 landslides (reactivated or inactive) for two purposes. The first one is to recognize the mode of sliding and style of activity. The other is to define the trend of post-movement deformation for the displaced mass.;The landuse study found that mining on the opposite river bank, and tree clearance in the upland area, have acted as triggering factors. The stratigraphic investigation found that in the upstream landslide succession, Lesueur, ice thrusting has occurred. This factor contributed to producing different types of landslides in the upstream and downstream successions. Mensuration and aerial photo interpretation, both used in slope movement monitoring, indicated that periodic river channel migration was responsible for reactivation of landslides during the past 35 years. Control surveying obtained the magnitude, trend and plunge of the movement vectors for different hubs set up at Lesueur landslide. Based on geometrical properties, the ground surveys divided the landslides into complex compound slides and multiple rotational slides. They also recorded the post-movement development of grabens and horsts. |
