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Wind Erosion:
An International Symposium/Workshop

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Implications of a Sandblasting Model for Dust Production
by Wind Erosion in Arid Areas

Alfaro S.C., M.V. López, M. Sabre, and L. Gomes


A sandblasting model has recently been developed that allows computation of size distributions of clay aerosols produced by bombarding a kaolin clay target with sand grains. It is adapted for the qualitative determination of the characteristics of dust emissions induced by saltation of 4 soil aggregates populations representative of non crusted soils found in arid areas. For each soil-aggregate size, the influence of the wind friction velocity on 1) the sandblasting efficiency (defined as the ratio of the vertical dust flux to the horizontal saltation mass flux), and 2) the size distribution of the dust were examined. Results were found to be in good qualitative agreement with available field or laboratory data for sandy soils. The main implications of this model are that, in terms of dust mass-production, sandblasting due to saltation of small aggregates is more efficient than the one due to coarser modes, but that these coarser modes contribute more than the smallest to the injection of very fine (submicron) dust particles into the troposphere.