Abstract
ABSTRACT BETWEEN January and July of 1984, 31 dust storms were recorded in Big Spring, TX and samples from 10 were sufficiently large for soil aggregate and particle analysis. Samples of airborne wind eroded material were collected from seven heights between 0.15 and 4 m above the soil surface. Changes in total quantity of solids, and the percentages of sand, silt and clay with height fit log-log distributions with correlation coefficients ranging from 0.90 to 0.94. The percent of silt and clay increased with height and the percent of sand decreased. However, as the sample size increased, the percent as sand increased and percent as silt and clay decreased. In addition, the mean diameter (MD) of individual particles and aggregates decreased with increasing height. The MD of particles in dispersed samples was 40 to 45% the diameter of undispersed samples (aggregates) at the same height or date. The largest samples were the product of high wind speeds and long storm durations and the sample size and particle distribution reflected the high wind energy levels of the morst severe storms
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