A new model for dust emission by saltation bombardment

In this paper, we present an analysis on the mechanism of dust emission and describe a new model for the prediction of dust emission rate caused by sa ltation bombardment, based on the volume removal by impacting sand grains a s they plough into the soil surface. The model predicts a relationship betw een the removed volume V and the particle impacting velocity U of the form V proportional to U-n, with n = 2 similar to 3. The dust emission rate is f ound to be proportional to u(*n+1), where u(*) is friction velocity. These model predictions are consistent with wind tunnel and field observations. T he model offers a new interpretation of observed data and a simple scheme f or the calculation of dust emission.