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Studying the spatial and temporal changes in aeolian sand transport in a wind tunnel using 3D terrestrial laser scanning
European Journal of Soil Science ( IF 4.2 ) Pub Date : 2020-01-05 , DOI: 10.1111/ejss.12929
Xuesong Wang 1 , Chunlai Zhang 1 , Songbo Cen 1 , Yujie Dai 1 , Xueyong Zou 1
Affiliation  

The spatial and temporal changes in aeolian sand transport are important in modelling wind erosion and parameterizing sand dunes and ripples. In this study, we explored the wind erosion processes that occur in sand beds using a Trimble 3D laser scanner. We found that the erosion intensity varied with distance along the sand bed and that the sand bed surface could be divided into three zones. In the pre‐bowl zone, the sand bed surface showed small and uniform variation, indicating weak erosion intensity in this zone. Downwind of the pre‐bowl zone, the bowl zone developed where the sand surface was eroded seriously and a kind of morphology analogous to blowouts occurred. The post‐bowl zone, which followed the bowl zone, was characterized by alternating accumulation and erosion. Wind velocity affected the spatial development of this bed morphology, whereas the erosion duration only affected the erosion depth. We developed an equation of the form QL = Qsat/(1 + e(−10(L‐s)/k)) to describe the relationship between sediment flux (QL) and bed length (L) in the pre‐bowl and bowl zones and found the fitting coefficients R2 were very high (1.0, 0.98, 0.97 at wind velocities 10.0, 11.0 and 12.0 m s−1, respectively). Using a fine spatial resolution for the measurements revealed features of the sand flux profile that were missed at coarser resolution. However, it will be necessary to use a longer sand bed to study the full length of the post‐bowl zone.

中文翻译:

使用3D地面激光扫描研究风洞中风沙运移的时空变化

风沙运移的时空变化对风蚀建模和沙丘和波纹参数化很重要。在这项研究中,我们使用Trimble 3D激光扫描仪探索了沙床中发生的风蚀过程。我们发现侵蚀强度随沿沙床的距离而变化,并且沙床表面可分为三个区域。在前碗区,砂床​​表面显示出较小且均匀的变化,表明该区的侵蚀强度较弱。在前碗区的顺风处,碗区发展到了沙面严重腐蚀的地方,并发生了类似于井喷的形态。碗后区域与碗后区域的特征是交替堆积和侵蚀。风速影响了该床形态的空间发展,而侵蚀持续时间仅影响侵蚀深度。我们开发了以下形式的方程Q L = Q sat /(1 + e (−10(L s)/ k))描述前碗区和碗区的沉积物通量(Q L)与床长(L)之间的关系,并发现拟合系数R 2非常高(风速10.0、11.0和12.0 m s -1分别为1.0、0.98、0.97)。使用精细的空间分辨率进行测量,可以发现在较粗分辨率下会漏掉的砂通量特征。但是,有必要使用更长的沙床来研究碗后区域的全长。
更新日期:2020-01-05
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