Aeolian sediment transport is influenced by a variety of bed surface properties. During wind erosion, the dynamic changes of many bed surface properties lead to dynamic changes of the sand transport rate. However, researchers often simplify their research by ignoring these changes, in part because the wind velocity is stable in a wind tunnel. This leads to an incomplete understanding of aeolian sand transport processes. In the present study, we quantified how the sand transport rate changes with increasing averaging time in a wind tunnel. We found that the average sand transport rate decreased with increasing wind erosion averaging time. This phenomenon had two causes: First, because the sand bed surface became increasingly rough during erosion, the wind's sediment transport capacity decreased. Second, the bed surface became increasingly coarse-textured as fine particles were removed by the wind, thereby decreasing sediment availability at the surface. Based on these experimental results, we established a new sand transport model that accounts for the effect of averaging time on the sand transport rate. We demonstrate the performance of the model using additional wind tunnel data.

风沙沉积物的运输受多种床面性质的影响。在风蚀过程中，许多床层表面特性的动态变化会导致砂传输速率的动态变化。但是，研究人员通常通过忽略这些变化来简化研究，部分原因是风速在风洞中是稳定的。这导致对风沙运输过程的不完全了解。在本研究中，我们量化了风洞中砂的传输速率如何随平均时间的增加而变化。我们发现随着风蚀平均时间的增加，平均砂子输送速率降低。这种现象有两个原因：首先，由于侵蚀过程中沙床表面变得越来越粗糙，风的泥沙输送能力降低了。第二，随着细粒被风吹走，床表面的纹理变得越来越粗糙，从而降低了表面的沉积物利用率。基于这些实验结果，我们建立了一个新的输沙模型，该模型考虑了平均时间对输沙速度的影响。我们使用其他风洞数据演示了模型的性能。