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Effects of gravel cover on the near-surface airflow field and soil wind erosion
Soil and Tillage Research ( IF 6.5 ) Pub Date : 2021-08-23 , DOI: 10.1016/j.still.2021.105133
Huiru Li 1 , Xueyong Zou 1 , Chunlai Zhang 1 , Liqiang Kang 1 , Hong Cheng 1 , Bo Liu 2 , Wei Liu 3 , Yi Fang 1 , Dongliang Yang 4 , Xiaoxu Wu 5
Affiliation  

Gravel cover is a traditional farming practice to improve soil properties and advance soil productivity. In arid areas, gravel cover can directly affect the near-surface airflow field to inhibit the soil wind erosion rate (q). The effectiveness of gravel cover in wind erosion control has been recognized in practice, but there are few reports about experimental data. This study aimed to identify the mechanism under which gravel changes the near-surface airflow field and q. The wind profiles at different positions around gravel roughness elements and q were measured under five inlet friction wind velocities (u*∞), five gravel sizes (D) and five gravel coverages (GC) in a large wind tunnel, and an equation of q was established. The results showed significant differences among the wind profiles due to the effects of u*∞, D and GC. Although the wind profile at any position did not represent the average state of the rough surface, the average wind profile of the different positions did. When the density of gravel roughness elements increased, the near-surface airflow changed from isolated-roughness flow to wake interference flow and skimming flow, which directly affected the spatial pattern and the rate of wind erosion. The equation of q established in this study not only integrated the effects of variables on the q, including D, GC, the average friction wind velocity (u*¯) and threshold friction wind velocity (u*t), but also represented the behavior of wind erosion being aggravated by gravel cover when GC ≤ 10 % and D ≥ 3.15 cm. This study can contribute to an understanding of the structural change to the near-surface airflow field and to the prediction of q on gravel-covered surfaces, which provides guidance information for rational utilization of gravel-covered fields in arid areas.



中文翻译:

砾石覆盖对近地表气流场和土壤风蚀的影响

砾石覆盖是一种传统的耕作方式,可改善土壤特性并提高土壤生产力。在干旱地区,砾石覆盖可以直接影响近地表气流场,抑制土壤风蚀速率(q)。砾石覆盖在控制风蚀方面的有效性在实践中得到了认可,但关于实验数据的报道很少。本研究旨在确定砾石改变近地表气流场和q 的机制。在约砾石粗糙度元素和不同位置上的风廓线q物在5个入口摩擦风速测量(Ú *∞),五种砾石尺寸(d)和五个砾石覆盖范围(GC)在一个大风洞中,建立了q的方程。结果表明,由于u *∞DGC的影响,风廓线之间存在显着差异。虽然任何位置的风廓线都不能代表粗糙表面的平均状态,但不同位置的平均风廓线可以。当砾石粗糙元素密度增加时,近地表气流由孤立粗糙流转变为尾流干扰流和撇渣流,直接影响空间格局和风蚀速率。本研究建立的q方程不仅综合了变量对q的影响,还包括D , GC , 平均摩擦风速 (*¯) 和阈值摩擦风速 ( u * t ),但也代表了当GC ≤ 10 % 和D ≥ 3.15 cm时砾石覆盖加剧风蚀的行为。该研究有助于了解近地表气流场的结构变化和砾石覆盖地表q的预测,为干旱地区砾石覆盖场的合理利用提供指导信息。

更新日期:2021-08-23
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