Wind Erosion and Transport

UNIT 5

STANDARDS:

STATE OBJECTIVES: NCES 2.1.1, 2.1.3, 2.1.4

LESSON 5

Lesson Objectives

In this lesson, you will learn about:– Conditions that contribute to wind erosion– Identification of wind-formed landscapes– How dunes form and migrate– The effects of wind erosion on human activities

Wind Erosion and Transport Fast moving winds

How does wind move a sediments

Suspension

Saltation

Can carry sediments the same way as water.

Wind may move particles by causing them to roll of become airborne and fly.

When particles are suspended in the air

When the particles bounce along on the ground

Effects of wind erosion

Deflation

Dust Bowl

Abrasion

The lowering of the landscape by the removal of soil by the wind.

Over time, whole dunes can move.

Remember video. 1930’s in Midwest US

Wind blown materials act as a sandblaster. It uses abrasive actions to remove material from solid rock.

Wind Deposition Dunes

Kuwait 2011 Phoenix 2011

As wind speed and direction change, particles settle out

Over time a pile of wind blown sand becomes a dune.

Gentle slope is windy side Steeper slope is on side

away from wind

Lesson Review

What climatic conditions produce wind erosion

How does vegetation affect the ability of wind to modify the landscape

How do sand dunes form How can wind erosion affect human

activity