Particulate Transport in the Atmosphere: Wind Erosion

  • B. B. Willetts
Conference paper

Summary

A general description is given of the transport process mechanics in the saltation layer and below, including the effect of the sand on the wind in time-averaged terms. Recent analyses of saltation and of intersaltation collision are reviewed, as is work on surface grain re-sorting. Attention is drawn to the lack of adequate knowledge of momentum transfer mechanisms in the saltation layer and the resulting instantaneous velocity field.

The evolution of sand transport models from that of Bagnold is described, including a requisite model not yet implemented for establishing the stable grain activity level in a given wind. The research needs of the subject are related to the problems of implementing this model.

Soil transport is discussed as a more complicated extension of sand transport. The research requirements of semi-arid agriculture are outlined and expressed in terms of models of clean air flow over complex terrain and of the responsive particle-laden boundary layer.

Keywords

Migration Quartz Dust Sorting Crest 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1988

Authors and Affiliations

  • B. B. Willetts
    • 1
  1. 1.Department of EngineeringUniversity of Aberdeen, Kings CollegeAberdeenUK

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