12-05-08

12-05-08 - Geography 1111 12/5/08 Glacial Processes and...

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Geography 1111 12/5/08 Glacial Processes and Landforms 1. Requirements for glaciation 2. Effects of ice action 3. Types of glaciation 4. History of glaciation 5. Mountain glaciation 6. Continental glaciation—landforms Requirements for Glaciation Glacier : mass of ice that persists all year and moves out of a zone of accumulation under the force of gravity Need: o Snowfall > Snowmelt (positive mass balance) o Compaction—fresh snow is about 90% air, glacial ice is 15% air o Total thickness of: 200+ inches for mountain glaciers, up to 10,000 inches for continental glaciers Zone of accumulation (top part), zone of ablation, crevasses, loss of ice by: meltwater and evaporation. Flows downward Mass balance is positive—mass glacier will get bigger, mass balance is negative it’s going to retreat and get smaller. Movement of Glacial Ice Internal flow of ice crystals Slippage of ice along the ground surface o Melts, refreezes, melts, refreezes- glacial movement (SLOW)
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This note was uploaded on 01/17/2011 for the course GEOG 1111 taught by Professor Hopkins during the Fall '08 term at UGA.

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12-05-08 - Geography 1111 12/5/08 Glacial Processes and...

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