The Process of Wind Erosion

John Tatarko Author

04/07/2019 Added

1650 Plays

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Factors and processes of wind erosion are explained in this video clip. The clip explains how wind velocity or speed affects wind erosive energy. The video also explains how the nature of the soil surface affects erosive wind energy. Production Facility: Educational Communications Center Bob Dole Hall, KSU. Editor: Cindy Jeffrey. Prog. RT: 35:05

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[00:00:00.040]The Dust Bowl helped to stimulate serious attention on the fundamental importance of
[00:00:09.220]our land. As a result, the basic causes, effects, and remedies of wind erosion have
[00:00:15.560]been the focus of research by the USDA's Agricultural Research Service. To understand
[00:00:21.680]wind erosion and its control, we need to understand the processes involved. Let's
[00:00:27.120]begin with the wind. Wind is simply air in motion. Air has mass, and when mass is in
[00:00:33.980]motion, it has energy. It is that energy that moves soil during wind erosion. And it's
[00:00:39.680]important to know that erosive wind energy increases by a factor equal to the wind speed
[00:00:45.260]cubed, so that a small increase in wind speed results in a large increase in erosive wind
[00:00:51.100]energy. The wind high above the soil surface unrestricted
[00:00:57.100]by barriers or objects is known as free stream air flow and moves more or less parallel to
[00:01:03.340]the surface. The wind near the surface impacts the soil and vegetation, which removes energy
[00:01:09.980]from the wind and slows it. So the average forward velocity near the soil surface
[00:01:14.920]surface is lower than in the free stream. The velocity increases as the distance above
[00:01:20.960]the surface increases. This velocity gradient is known as a wind velocity profile.
[00:01:26.480]The nature of the surface over which the wind is traveling can greatly influence this wind
[00:01:34.180]profile as well as the wind energy near the surface. When the soil is rough, large clods
[00:01:41.700]or furrows protrude into the windstream. While these protruding soils are exposed to stronger
[00:01:47.420]winds, they also remove energy from the wind and thus protect the lower surrounding soil.
[00:01:52.680]This protection allows particles eroding from the upper positions to be trapped in the lower
[00:01:58.100]positions. Vegetative material, either live or dead, also absorbs wind energy near the
[00:02:05.480]soil surface and can trap moving soil particles. Rough, cloddy, or vegetated surfaces alter the wind speed at the soil surface and reduce the available to
[00:02:11.580]soil surface and can trap moving soil particles. Rough, cloddy, or vegetated surfaces alter the wind speed at the soil surface and reduce the energy available to
[00:02:11.680]soil surface and can trap moving soil particles. Rough, cloddy, or vegetated surfaces alter the wind speed at the soil surface and reduce the available to
[00:02:15.800]erode the soil. However, if the free stream wind speed is great enough, the wind at the
[00:02:21.120]surface will contain sufficient energy to initiate soil particle movement.
[00:02:25.060][credits]
[00:02:26.060][credits]

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The Process of Wind Erosion

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