Base de données de recherche des TNO

Régions: Inuvialuit Settlement Region

étiquettes: physical sciences, active layer, permafrost, ground ice, topography

Objectif(s): This project investigates the development of near-surface ice in sediments of the Mackenzie delta area. In permafrost terrain, an ice rich zone is frequently found just below the base of the active layer, and it is significant for several reasons: 1) It is ubiquitous in permafrost regions and may act as a significant hydrological reservoir; 2) It is close to the active layer, therefore surface disturbances which may lead to thawing result in local subsidence and terrain instability and; 3) it may act as a thermal buffer to warming. The goal of this research is to contribute to our understanding of spatial and temporal variability in development of near-surface ground ice.

Description du projet: This project investigates the the distribution and amount of near-surface ice in sediments of the Mackenzie delta area near Inuvik. Sites near Inuvik will be accessed via road and sampled using a hand held power auger. Sites on the Delta will be accessed by boat from a base at Gill's cabin, and sampled with a power auger. In both general areas soil cores will be removed and taken to the Inuvik Research Center for subsequent examination.Permafrost thichness on the delta will be measured by near-surface water jet drilling which uses a pressurized stream of water to drill small holes in the frozen sediments. Environmental impacts of these procedures are negligible.