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[object Object],[object Object],[object Object],[object Object]
 
Striations on Glacially Scoured Rock Source: http://www.bgrg.org/pages/education/alevel/coldenvirons/Lesson%2010.htm
Meltwater stream emerging from the snout of a glacier – the milky appearance is due to rock flour  Source: http://www.bgrg.org/pages/education/alevel/coldenvirons/Lesson%2010.htm
A boulder dislodged by the process of plucking Source:   http://gemini.oscs.montana.edu/~geol445/hyperglac/eroproc1/plucking.htm
KEY: Factors related to presence / characteristics of debris Factors related to the ice FACTORS AFFECTING RATES OF GLACIAL ABRASION GLACIAL ABRASION Relative hardness of particles and bedrock Ice thickness Basal Water Pressure Movement of debris to the base Sliding of Basal Ice Removal of fine debris Debris size and shape Presence of Basal Debris Concentration of Basal Debris Velocity Other factors
Factors affecting rates of Plucking ,[object Object],[object Object],[object Object]
Relationships between factors affecting glacial erosion: ,[object Object],[object Object],[object Object]
Diagram showing theoretical relationship between rates of abrasion, ice velocity and pressure Source: http://www.bgrg.org/pages/education/alevel/coldenvirons/Lesson%2010.htm
Relationship between basal debris concentration, sliding velocity and abrasion rates.
Spatial / Temporal Variations in factors affecting glacial erosion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Rates of Glacial Abrasion ,[object Object],During the 1970s Geoffrey Boulton, a leading glacial geomorphologist, fixed rock plates (composed of marble) in front of moving ice at the base of two glaciers. After the glacier had overridden the plates they were removed and inspected (Table 1).  Table   1. Rates of glacial abrasion. Source Boulton 1974.  Source:  http://www.bgrg.org/pages/education/alevel/coldenvirons/Lesson%2010.htm Look at the figures in the table above for the Breidamerkurjokull glacier – which of the factors appears to be most important? Ice thickness or velocity? 250 ma -1 100 m 36 mma -1 Glacier d Argentiere (France)  15.4 ma -1   32 m 3.75 mma -1 Brei  amerkerjokull 3 19.5 ma -1 15 m 3.4 mma -1 Brei  amerkerjokull 2 9.6 ma -1 40 m 3 mma -1   Brei  amerkerjokull 1 (Iceland) Velocity Ice thickness Abrasion rate Glacier
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object]

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Copy Of Glacial Erosion

  • 1.
  • 2.  
  • 3. Striations on Glacially Scoured Rock Source: http://www.bgrg.org/pages/education/alevel/coldenvirons/Lesson%2010.htm
  • 4. Meltwater stream emerging from the snout of a glacier – the milky appearance is due to rock flour Source: http://www.bgrg.org/pages/education/alevel/coldenvirons/Lesson%2010.htm
  • 5. A boulder dislodged by the process of plucking Source: http://gemini.oscs.montana.edu/~geol445/hyperglac/eroproc1/plucking.htm
  • 6. KEY: Factors related to presence / characteristics of debris Factors related to the ice FACTORS AFFECTING RATES OF GLACIAL ABRASION GLACIAL ABRASION Relative hardness of particles and bedrock Ice thickness Basal Water Pressure Movement of debris to the base Sliding of Basal Ice Removal of fine debris Debris size and shape Presence of Basal Debris Concentration of Basal Debris Velocity Other factors
  • 7.
  • 8.
  • 9. Diagram showing theoretical relationship between rates of abrasion, ice velocity and pressure Source: http://www.bgrg.org/pages/education/alevel/coldenvirons/Lesson%2010.htm
  • 10. Relationship between basal debris concentration, sliding velocity and abrasion rates.
  • 11.
  • 12.
  • 13.
  • 14.