GEO 1111 Lecture Notes - Lecture 18: Silt, Deflation

• School: University of Ottawa
• Department: Geology
• Course: GEO 1111
• Professor: David Schneider

Document Summary

Wind flow vs. stream flow: gas vs liquid state: , but still a fluid, less viscous in water, less dense, flow velocity & turbulence greater for wind and more turbulent, channelization water tends to be channelized, wind movement doesn"t have an upper surface, just keeps expanding, sediment can be transported by both wind & water, water is more efficient because it more viscous, eroding agent effect with sand vs. no effect with sand in wind would be increased effect. Wind as an erosion agent: areas that are susceptible to large sandstorms, weathering provides particles which are more easily picked up if dry, deflation: erosion of vulnerable dry land surface which results in the lowering of its elevation, increased if you have low vegetation, and decreased with higher vegetation, desert pavement: coarse material grounded, transfer fine stuff leave a lot of course pebbles on top, two proposed mechanisms: