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DTSTART;TZID=America/New_York:20250115T130000
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DTSTAMP:20260522T002546
CREATED:20250113T161958Z
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UID:7897-1736946000-1736949600@permafrostnet.ca
SUMMARY:Seminar - 15 January‚ Characterizing the setting and dynamics of permafrost mass wasting in the central Mackenzie Valley\, Northwest Territories.
DESCRIPTION:Date: Wednesday 15th January 2025Time: 1pm Eastern Time / 11am Mountain Time \n\n\n\nJoseph Young will be presenting Characterizing the setting and dynamics of permafrost mass wasting in the central Mackenzie Valley\, Northwest Territories. \n\n\n\nDate: 15 January 2025Time: 13:00-14:00 Eastern Time \n\n\n\nPermafrost landslides throughout the western Canadian Arctic have increased in magnitude and frequency over the past ca. 20 years in concert with climate drivers of permafrost thaw. This non-linear acceleration has intensified landslide processes and feedbacks\, increasing the diversity of landforms that pose emergent risk and hazards to infrastructure\, water quality\, and soil carbon. This presentation uses field and remote-sensing observations to provide a regional framework to highlight the influence of permafrost setting\, landscape history\, terrain conditions\, and climate drivers on variations in thaw-driven landslide mechanics. We describe a continuum of landslide activity with a process-form model that involves top-down and bottom-up thawing\, intermediated by internal thermal degradation altering slope properties. This includes a novel slope failure style that involves detachment at the base of relatively warm and thin permafrost\, resulting in rapid large-scale landslides in areas previously thaw-stable. Collectively\, regional characterizations of permafrost landslide types and their dominant failure mechanisms are critical in anticipating areas susceptible to thaw-driven slope failure in the future. \n\n\n\nZoom details for all our seminars will be posted in our Teams site.
URL:https://permafrostnet.ca/event/seminar-15-january-characterizing-the-setting-and-dynamics-of-permafrost-mass-wasting-in-the-central-mackenzie-valley-northwest-territories/
LOCATION:Zoom
ATTACH;FMTTYPE=image/jpeg:https://permafrostnet.ca/wp-content/uploads/2024/11/Frederic-Brieger.jpg
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DTSTART;TZID=America/New_York:20250122T130000
DTEND;TZID=America/New_York:20250122T140000
DTSTAMP:20260522T002546
CREATED:20241111T150507Z
LAST-MODIFIED:20260522T041754Z
UID:7763-1737550800-1737554400@permafrostnet.ca
SUMMARY:Seminar - 22 January‚ Permafrost Terrain Disturbance Susceptibility in the Nacho Nyäk Tagé (Stewart River) Watershed\, Yukon.
DESCRIPTION:Date: Wednesday 22nd January 2025Time: 1pm Eastern Time / 11am Mountain Time \n\n\n\nFrederic Brieger will be presenting Permafrost Terrain Disturbance Susceptibility in the Nacho Nyäk Tagé (Stewart River) Watershed\, Yukon. \n\n\n\n\n\nThe Nacho Nyäk Tagé (Stewart River) watershed in the traditional territory of the First Nation of Na-Cho Nyäk Dun (central Yukon) is underlain by extensive discontinuous permafrost and locally highly sensitive to thaw. In addition to impacts from climate change to its ecology\, geomorphology\, and hydrology\, this culturally important area is pressured by mining activities and their environmentally harmful practices. Timely community-led land-use planning is necessary to develop effective management\, conservation\, and adaptation strategies. My project aims to contribute assessments on the distribution and susceptibility towards permafrost terrain disturbances (PTDs) in the watershed to the undergoing land-use planning process. \n\n\n\n\n\n\n\n\n\n\n\nA total of 277 PTDs including 80 retrogressive thaw slumps (RTSs) were mapped in satellite imagery to understand the current spatial distribution of thaw-induced geohazards in the watershed. PTDs are indicators of sensitive permafrost terrain that is likely to respond strongly to climate change. RTSs in particular are indicative of thawing ice-rich permafrost and have increased in frequency and activity. Along the banks of Nacho Nyäk Tagé\, they are typically associated with ice-rich glaciolacustrine sediments or tills\, as validated by field observations. \n\n\n\nTerrain susceptibility towards PTDs was modelled using random forest machine learning at a 16 m spatial resolution and revealed distinct spatial patterns related to the physiography and climatic history of the region. Tenfold cross-validation resulted in an average AUROC of 0.89\, indicating high accuracy of model predictions. RTSs are predominantly found on gentle\, northwest to northeast-facing slopes and riverbanks consisting of fine-grained glaciogenic sediments from the late McConnell glaciation. \n\n\n\nZoom details for all our seminars will be posted in our Teams site.
URL:https://permafrostnet.ca/event/seminar-22-january-permafrost-terrain-disturbance-susceptibility-in-the-nacho-nyak-tage-stewart-river-watershed-yukon/
LOCATION:Zoom
ATTACH;FMTTYPE=image/jpeg:https://permafrostnet.ca/wp-content/uploads/2024/11/Frederic-Brieger.jpg
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20250124T130000
DTEND;TZID=America/New_York:20250124T140000
DTSTAMP:20260522T002546
CREATED:20250120T172742Z
LAST-MODIFIED:20260522T040033Z
UID:7974-1737723600-1737727200@permafrostnet.ca
SUMMARY:PYRN Webinar - 24 January\, Permafrost modelling and Technology
DESCRIPTION:
URL:https://permafrostnet.ca/event/pyrn-webinar-24-january-permafrost-modelling-and-technology/
LOCATION:Zoom
ATTACH;FMTTYPE=image/jpeg:https://permafrostnet.ca/wp-content/uploads/2025/01/PYRN_webinar_01.2025.jpg
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20250129T130000
DTEND;TZID=America/New_York:20250129T140000
DTSTAMP:20260522T002546
CREATED:20241111T151848Z
LAST-MODIFIED:20260522T040033Z
UID:7764-1738155600-1738159200@permafrostnet.ca
SUMMARY:Seminar - 29 January‚ Understanding Frost Jacking Effects on Transportation Infrastructure in Permafrost Regions: Insights from the Hudson Bay Railway.
DESCRIPTION:Date: Wednesday 29th January 2025Time: 1pm Eastern Time / 11am Mountain Time \n\n\n\nNatalie Arpin will be presenting Understanding Frost Jacking Effects on Transportation Infrastructure in Permafrost Regions: Insights from the Hudson Bay Railway. \n\n\n\nThe Hudson Bay Railway plays a crucial role in Canada by providing an all-season\, land-based pathway to transport goods to Northern communities\, but the diverse ground conditions\, ranging from isolated to continuous permafrost\, create significant obstacles in maintaining its operation. The presentation will discuss current efforts to improve understanding of how ground conditions affect railway bridges\, with a specific focus on frost jacking. \n\n\n\nZoom details for all our seminars will be posted in our Teams site.
URL:https://permafrostnet.ca/event/seminar-29-january-understanding-frost-jacking-effects-on-transportation-infrastructure-in-permafrost-regions-insights-from-the-hudson-bay-railway/
LOCATION:Zoom
ATTACH;FMTTYPE=image/png:https://permafrostnet.ca/wp-content/uploads/2024/11/pn_NatalieArpin.png
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