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Wind Erosion:
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Dynamics of Atmosphere and Wind Energy During Dust Storms

A.N. Sazhin and U.I. Vasiliev


Contemporary wind erosion manifests more actively in 2 regions: the Eastern-European and the Western-Siberian plains. The probability of appearance of dust storms is approximately the same: annually from 2-3 to 20-30 days. The regional peculiarities of the contemporary wind erosion consist of destroying and blowing soil which

takes the character of catastrophe with the definite periodicity (in the European steppes).

In Siberia and Kazachstan these processes are more steady in time but less intensive. It is connected with the circulation of atmosphere. The result of it is the recurrance of strong and steady winds . During the process of blockade the wind speed reaches storm and hurricane power in the Southern West of the Eastern-European plain during the long period of time (18-34 m/s). In this case the wind energy exceeds the climatic norm in 20-100 times.

In the South of the Western-Siberian plain in the time of frontal processes during strong dust storms, the strengthening of the Western wind is momentary (maximum speed - 12 - 22 m/s). Current energy is increasing only by 2-4 times, that's why soil blowing is less intensive. The little particles of soil are being blown from 2-3 to 20-22 m (from 1 hectare of the Nizhneye Povolzheye steppes). The soil of the Northern Caucasus loses from 3-5 to 25-38 m of substance . As for the Western Siberia it loses from 7-10 m to 40-60 m and more.