Wind tunnel measurements of the mean saltation length L and of different proxies of the mean saltation height H in saturated aeolian sand transport indicate that L and H are relatively insensitive to both the wind speed and grain diameter d. The latter result is currently unexplained and contradicts the theoretical prediction $L\propto H\propto d$. This prediction is based on the assumption that the characteristic velocity $\sqrt{\tilde{g}d}$ of bed grains ejected by the splash of an impacting grain controls the average saltation kinematics. Here, we show that a recent analytical saltation model that considers only rebounds of saltating grains, but neglects splash ejection, is consistent with the measurements. The model suggests that the buffer layer of the inner turbulent boundary layer, which connects the viscous sublayer with the log-layer, is partially responsible for the insensitivity of L and H to d. In combination, the measurements and model therefore indicate that splash ejection, though important to sustain saltation, does not significantly affect the average saltation kinematics. This finding represents a strong argument against the Ungar and Haff (1987)-scaling and in favor of the Durán et al. (2011)-scaling of the saturated saltation mass flux, with implications for ripple formation on Mars. Furthermore, it supports the recent controversial claim that this flux is insensitive to soil cohesion.

平均跃移长度L和饱和风积砂输送中平均跃移高度H的不同代理的风洞测量表明，L和H对风速和颗粒直径d都相对不敏感。后一个结果目前无法解释，与理论预测相矛盾$升\propto H\propto d$. 该预测基于特征速度$\sqrt{\tilde{G}d}$由撞击颗粒的飞溅喷出的床颗粒控制平均跳跃运动。在这里，我们表明最近的分析跃迁模型仅考虑跃迁颗粒的反弹，但忽略了飞溅喷射，与测量结果一致。该模型表明，连接粘性子层和测井层的内部湍流边界层的缓冲层是L和H对d不敏感的部分原因. 因此，测量结果和模型相结合，表明飞溅喷射虽然对维持跃迁很重要，但不会显着影响平均跃迁运动学。这一发现代表了反对 Ungar 和 Haff (1987) 尺度的有力论据，并支持 Durán 等人。(2011) - 饱和跃迁质量通量的缩放，对火星上的涟漪形成有影响。此外，它支持最近有争议的说法，即这种通量对土壤凝聚力不敏感。