Aerodynamic roughness length of sandy beds and gravel beds
Aerodynamic roughness length of sandy beds and gravel beds
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DOI：
10.1007/s12665-012-1607-1
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发表时间：
2012-02
影响因子：
2.8
通讯作者：
P. Lv;Z. Dong
中科院分区：
文献类型：
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作者：
P. Lv;Z. Dong
基于Monin-Obukhov相似理论和量纲分析，建立了不同大气稳定条件下砾石层和砂层气动粗糙度长度的物理模型。然后使用该模型研究了粗糙度长度、粗糙度元素的属性、气流特征和大气稳定性参数（体理查森数）之间的关系。结果表明，粗糙度长度不仅是粗糙度元素和气流的形状、高度和覆盖范围的函数，而且还取决于大气稳定性。这些结果与风洞实验和现场观测的结果一致。
A physical model was developed for the aerodynamic roughness length of gravel beds and sandy beds under different atmospheric stability conditions based on Monin–Obukhov similarity theory and dimensional analysis. The relationship between the roughness length, the properties of the roughness elements, the characteristics of the airflow, and an atmospheric stability parameter (the bulk Richardson number) was then studied using the model. Results showed that the roughness length was not only functions of the shape, height, and coverage of the roughness elements and of the airflow, but also dependent upon atmospheric stability. These results were in agreement with results from wind tunnel experiments and field observations.