Base de données de recherche des TNO

Régions: Inuvialuit Settlement Region, Gwich'in Settlement Area, Sahtu Settlement Area, Dehcho Region

étiquettes: active layer, ground temperature, permafrost, climate change, land use planning, environmental baseline, environmental impact assessment

Objectif(s): To provide baseline knowledge of permafrost and terrain conditions (specifically ground temperature and permafrost active layer thickness) and improve characterization of terrain sensitivity in the Mackenzie Valley.

Description du projet: This project continues the on-going monitoring program of the same title (Licence # 15207 Permafrost monitoring and collection of baseline terrain information in the Mackenzie Valley Corridor, NWT). This phase of the project is largely data collection. Objectives are: • To provide baseline knowledge of permafrost and terrain conditions (specifically ground temperature and permafrost active layer thickness) and improve characterization of terrain sensitivity in the Mackenzie Valley. • To monitor ground temperature and active layer to detect changes in permafrost conditions resulting from surface disturbance or climate change and to improve prediction of future response. • To provide information which contributes to environmental impact assessment and mitigation of northern development, land use planning and to climate change assessments. The combined temperature and active layer monitoring network extends from Fort Simpson to the Arctic Coast. With monitoring instrumentation already in place through work under previous licenses, the main work of this phase will be data collection. While different parts of the network are visited at different times by different researcher team members, most sites are expected to be visited briefly (less than an hour) annually, and all sites will be visited at least once every two years. The principal active layer monitoring trip will be in August; temperature data is also collected at many sites during this trip. Travel will be by road, small boat on the river and helicopter from Inuvik. Access to the sites is always on foot from road or river. This year will be the 19th annual survey of a network of thaw depth measuring devices (thaw tubes) and temperature data loggers along a transect extending from Fort Simpson to Tuktoyaktuk. The tubes consist of small diameter (2.5cm. or 1”) water filled pipes anchored at 4 meter (12') depth and protruding about 30cm (1') above the surface that record the maximum annual thaw depth at a site. Temperature loggers are installed in small screens above ground and buried just below the surface. The principal temperature monitoring trip will be in late September extending from south of Fort Simpson to Fort Good Hope. Temperature monitoring site visits of less than an hour will be used to retrieve data from on-site instrumentation, and service and re-program the instruments for continued data collection. Access will be mainly by helicopter and/or road (if near town, or in winter) and by foot. Visits will cause minimal disturbance. Accumulated over several years, the series of annual active layer thaw depth readings and the collection of long term ground temperature records in permafrost and unfrozen ground will show how changes in permafrost conditions are related to changing climatic and other environmental conditions. This phase of the project is largely data collection. Travel to most sites will be by helicopter from Norman Wells, Fort Simpson and Inuvik. While local transport operators are involved, it is difficult to have direct local involvement due to transportation logistics and the load associated with equipment and Geological Survey of Canada (GSC) personnel. There may however be some opportunities for limited local involvement in addition to utilization of local suppliers for accommodation, vehicles and other supplies. The research team will communicate with Northwest Territories communities through the scientific license application process. Information generated by the project will be made available through GSC publications (available for free download) and scientific publications. Reports and publications from this study will be sent to the regional regulatory organizations. Dissemination to communities will occur through reports and/or presentations. The research team will gladly provide any additional information required in any practical way. The fieldwork for this study will be conducted from August 1, 2014 to October 10, 2014.