Détection de glaces massives en milieu pergélisolé par la technique géophysique de micro-gravimétrie

Authors: Loranger, Benoît
Advisor: Doré, GuyFortier, Daniel
Abstract: Gravity surveys were carried out using a precision gravimeter Scintrex CG-3+ on the discontinuous permafrost zone in lands where massive ice bodies were suspected (Dry Creek, Yukon) or previously detected (Beaver Creek, Yukon and in the area of Kangerlussuaq, Greenland). The main objective of the research was to establish the feasibility of using gravity surveying for massive ice detection. The possibility of using a gravimeter to detect massive ice was clearly demonstrated. Indeed, negative residuals anomalies were detected and these can be clearly attributed to the presence of ice in the ground. The presence of ice was carried out during a drilling and coring campaign in Dry Creek and through published reports of previous drilling for Beaver Creek and Greenland sites. A simple two-dimensional model composed of verticals columns was adapted to the micro-gravity environment. The comparisons between models and field results are good for ice wedges terrains and satisfactory for voluminous massive ice.
Document Type: Mémoire de maîtrise
Issue Date: 2017
Open Access Date: 24 April 2018
Permalink: http://hdl.handle.net/20.500.11794/27705
Grantor: Université Laval
Collection:Thèses et mémoires

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