Periglacial Systems
- Created by: roror
- Created on: 17-05-18 11:36
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- Periglacial Systems
- Landforms
- Ice Wedges
- Narrow cracks filled with ice. Milky appearance due to air bubbles
- Cold, continuous permafrost
- In summer, small crack is filled with meltwater. Freezing causes soil to contract. Widens and deepens crack to form wedge
- In warmer climates, ice can be melted and replaced with sediment- ice-wedge cast
- In summer, small crack is filled with meltwater. Freezing causes soil to contract. Widens and deepens crack to form wedge
- Pingos
- Open System
- Discontinuous permafrost
- Water seeps into upper ground and flows under pressure to flat areas between permafrost and frozen ground beneath
- Water freezes into an expanding ice lens, pushing up low land above it
- Hydraulic ice core
- Closed System
- Continuous permafrost
- Permafrost layer at lakebed is insulated so thaws
- Sandwiched between lake and underlying permafrost
- Lake drains so lakebed isn't insulated and freezes
- Due to pressure differences, newly freezing water gathers to form an expanding ice lens
- Sediments are pushed up to form a dome
- Due to pressure differences, newly freezing water gathers to form an expanding ice lens
- Lake drains so lakebed isn't insulated and freezes
- Sandwiched between lake and underlying permafrost
- Hydrostatic ice core
- Open System
- Terracettes
- Small steps running horizontally along contours of a slope
- Thermokarst
- Depressions in surface from melting permafrost= HUMANS
- Patterned Ground
- Circles, nets, stripes, steps, polygons
- Ice crystals develops, causing increased volume of soil and upwards expansion of soil surface
- Permafrost
- Ice Wedges
- Landforms
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