Permafrost in Canada, from: http:sts'gsc'nrcan'gc'capermafrostdistribution'htmhttp:sts'gsc'nrcan'gc' - PowerPoint PPT Presentation

Title: Permafrost in Canada, from: http:sts'gsc'nrcan'gc'capermafrostdistribution'htmhttp:sts'gsc'nrcan'gc'


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Permafrost in Canada, from http//sts.gsc.nrcan.
gc.ca/permafrost/distribution.htmhttp//sts.gsc.nr
can.gc.ca/permafrost/pfmapheg2.jpg
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Cross-section of Permafrost by latitude from
http//sts.gsc.nrcan.gc.ca/permafrost/distribution
.htmhttp//sts.gsc.nrcan.gc.ca/permafrost/pfmapheg
2.jpg
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Pipkrake subsurface needle ice, Parry Sound,
Ontario
Segregation ice, Nunavut
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Periglacial Ground Disturbance Heaved surfaces
Palsas - Nunavut
Frost Mound, Nunavut
Pingo - McKenzie River Delta, Northwest
Territories
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Periglacial Ground Disturbance -- Segregation ice
morphology Ice lens
Heaved surface
Ice lens
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Periglacial Ground Disturbance -- Patterned Ground
Polygons (5-7m diameters), Northwest Territories
High-centred polygons (10-15m diameters),
Nunavut
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Periglacial Ground Disturbance -- Patterned
Ground Ice wedge polygons
Contraction cracks
Active Layer
Permafrost
Ice wedges
High-centred polygons
Trenches over ice wedges thickened active layer
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Periglacial Ground Disturbance -- Patterned
Ground Frost boils, Nunavut
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Periglacial ground disturbance Cryoturbation,
Solifluction
Cryoturbated soil horizons over an ice
wedge, Nunavut
Soilfluction lobe, Nunavut
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Periglacial ground disturbance -- Thermokarst
Thermokarst ponds, including vehicle-track
remnants, Northwest Territories
Active layer collapse/flow, Nunavut
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Northern Lifestyles Managing in the Periglacial
Settling and tilting of bank, Dawson, Yukon
Adjustable stilts, gravel lot, heavily- insulated
hotel, Baker Lake, Nunavut
Elevated roadbed, Dempster Highway, Yukon
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Northern Lifestyles Managing in the Periglacial
Cemetery sited on bedrock,burial without
excavation
Gravel-pad lots, elevated floors, heavily
insulated homes
Utilidor insulates municipal pipeline networks