Air has low density, so wind is a relatively minor agent of geomorphic change


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Air has low density, so wind is a relatively minor agent of geomorphic change

  • Air has low density, so wind is a relatively minor agent of geomorphic change

  • Rock density 2000 times density same volume of air

  • so rock fragments are difficult to lift with air.

  • A one meter per second (1 m/sec) flow of water lifts the same particle as about 30 m/sec flow of air



"Undercut, mushroom shaped pedestal rocks in desert areas are commonly attributed to wind erosion"

  • "Undercut, mushroom shaped pedestal rocks in desert areas are commonly attributed to wind erosion"

  • Ignore Bloom's comments p291 right 1 following the line above.

  • This area is frequently hit with high sandstorms. These remove the paint from our trucks.

















Reduced wind velocity results in sediments deposition

  • Reduced wind velocity results in sediments deposition

  • Dunes are hills of loose wind-born sand

  • Size, shape, and orientation of dunes are determined by available sand, vegetation, and wind





















Isolated – low sand supply; migrating across rock

  • Isolated – low sand supply; migrating across rock





Stabilized “horns" point upwind

  • Stabilized “horns" point upwind





In dry areas very high winds can suspend fine sand particles

  • In dry areas very high winds can suspend fine sand particles







Origins

  • Origins

    • Desert
    • Glacial





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