Transcript Power Point Presentation

Glacier Dynamics in a Changing Climate
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Variables that affect glacier flow:
- Valley slope
- Ice temperature
- Basal conditions
Glaciers Flow:
•Downhill (slope affects flow speed)
•Warmer ice flows faster
•Ice is brittle (crevasses) & ductile
•Basal characteristics are important
(the presence of water at the bed)
How Ice Flows: Basal Conditions
Preparing the PVC pipe
Basal Conditions
Rough Bed
PVC pipe lined with
sandpaper
Normal Bed
PVC pipe
Lubricated Bed
PVC pipe lined with
aluminum foil and
lubricated with oil
How Ice Flows: Valley Slope
Angle of PVC pipe
Valley Slope
Shallow
25°
Medium
45°
Steep
65°
How Ice Flows: Ice Temperature
Flubber temperature
Ice Temperature
warm
ice
normal
ice
cold
ice
Cold Ice
(blue flubber)
Flubber placed in the
freezer prior to class
Normal Ice
(white flubber)
Flubber at room
temperature
Warm Ice
(pink flubber)
Flubber microwaved
until hot to touch
Lab setup
basic setup
advanced setup