LAB 9

From GeoClasses

Goals:

Frankel and Pazzaglia, 2006:

• from fig. 9: demonstrate Rva with the wet sand in boxes from previous lecture - scoop out valley with spoon (test first)
• from fig. 10: try the sand box model while constantly and slowly increasing the height of one end of the box (tectonic uplift)

• see if any of the map sets will work for this

angle of repose

• poster explaining these types of experiments
• working in groups of 3, slowly pour your dry material (50 mL) onto the same spot on the tray.
  • what grain size and degree of rounding does your material have?
  • describe what happens as the pile gets higher
  • measure the angle of repose
  • compare your results with the other groups - plot on grain size vs. angle of repose graph
• mass wasting - try injecting water with syringe to see if can trigger landslide

• now incrementally add water to your material:
  • at each increment of water, attempt to build as tall of a tower/castle/mountain as you can
  • record in a table how tall your tower was at each increment of water added
  • plot on graph of volume water added vs. height of tower
  • compare plots with the class: does rounding matter? does grain size matter?
    • what happens when you get too much water? (liquefcation) What is the optimal ratio (by volume) of water/rock for building sand castles out of your material?

• • • ex:filling a valley when river gets dammed by landslide - figure out how high the water level will reach
    • maybe use clay to make 3D models of topographic maps?