On the effect of mid‐air collisions on aeolian saltation

The effect of mid‐air collisions on aeolian saltation is investigated using concentration profiles and grain velocities predicted by a numerical saltation model. The probability of a mid‐air collision is found to be greater at high wind speeds. It is also found that mid‐air collisions tend to reduce the number of grain/bed impacts and thus reduce the number of ejecta near the bed; this, in turn, reduces the intensity of mid‐air collisions. It is suggested that this feed‐back mechanism significantly influences transport rates at high wind speeds.