GEOB 103 Chapter Notes - Chapter 9: Coastal Erosion, Periglaciation, Solifluction
15 Apr 2016
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Deforms ice, causing melting without changing temperature. Evidence: glacial erosion (photo 9. 1) and deposition (photo 9. 2d) Glacier: persistent lowing bodies of ice that originated as snow . Accumulation: snow irn ice (ig. Ablation: melt meltwater streams calving icebergs (ig. Energy inputs: elevation, latitude, season (lapse rates ~0. 6 - 1 /100m) Ablation zone, equilibrium line. altitude/snow line, accumulation zone (ig. Two components: ice creep (deformation) and basal sliding (water at the base) Sea level + calving rate terminus position (photo 9. 5+9. 11) Thermal proiles for warm and cold based ice (ig. Cold-based margins subglacial lakes (in antarctica for example) Pipes from by thermal erosion (seasonal expansion/contraction) Jokulhlaups: a type of glacial outburst lood. Scablands: a relatively barren and soil-free landscape that was scoured by loods unleashed when a large glacial lake drained. Hole in ice that ills in with sediment-hill; found at the end of an esker. Meandering, steep sided ridge; river lowing underneath ice, sediment drop, ice tunnel.
