Wind‐blown sand over gobi can cause severe sand abrasion. The vertical flux profiles, especially that of the kinetic energy (KE), determine the erosion intensity. However, the vertical distribution of the KE flux of wind‐blown sand over gobi remains poorly understood. Here, we report comprehensive field‐based measurements of the vertical flux profiles of wind‐blown sand over three typical gobi surfaces during four transport events. The results show that unlike the exponential decrease in the particle count flux with height, the KE flux profile curve was nonmonotonic and could be well fitted by a Pearson VII function. The height where the maximum KE flux density occurred (kink points) ranged from 0.09 to 0.15 m above the ground. In addition, the nonmonotonic KE flux profiles primarily emerged during periods of strong transport and were mainly caused by large saltating sand particles due to their high KE as they rebounded from the grain‐bed collision.

文章链接：https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020GL091224