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Scalar-Flux Similarity in the Layer Near the Surface Over Mountainous Terrain
Boundary-Layer Meteorology ( IF 4.3 ) Pub Date : 2018-06-14 , DOI: 10.1007/s10546-018-0365-3
Eleni Sfyri 1 , Mathias W Rotach 1 , Ivana Stiperski 1 , Fred C Bosveld 2 , Manuela Lehner 1 , Friedrich Obleitner 1
Affiliation  

The scaled standard deviations of temperature and humidity are investigated in complex terrain. The study area is a steep Alpine valley, with six measurement sites of different slope, orientation and roughness (i-Box experimental site, Inn Valley, Austria). Examined here are several assumptions forming the basis of Monin–Obukhov similarity theory (MOST), including constant turbulence fluxes with height and the degree of self-correlation between the involved turbulence variables. Since the basic assumptions for the applicability of the MOST approach—horizontally homogeneous and flat conditions—are violated, the analysis is performed based on a local similarity hypothesis. The scaled standard deviations as a function of local stability are compared with previous studies from horizontally homogeneous and flat terrain, horizontally inhomogeneous and flat terrain, weakly inhomogeneous and flat terrain, as well as complex terrain. As a reference, similarity relations for unstable and stable conditions are evaluated using turbulence data from the weakly inhomogeneous and flat terrain of the Cabauw experimental site in the Netherlands, and assessed with the same post-processing method as the i-Box data. Significant differences from the reference curve and also among the i-Box sites are noted, especially for data derived from the i-Box sites with steep slopes. These differences concern the slope and the magnitude of the best-fit curves, illustrating the site dependence of any similarity theory.

中文翻译:

山地地形上近地表层的标量通量相似性

在复杂地形中研究了温度和湿度的标度标准偏差。研究区是一个陡峭的阿尔卑斯山谷,有六个不同坡度、方向和粗糙度的测量点(i-Box 实验点,Inn Valley,奥地利)。这里检验的是构成 Monin-Obukhov 相似理论 (MOST) 基础的几个假设,包括随高度变化的恒定湍流通量以及所涉及的湍流变量之间的自相关程度。由于违反了 MOST 方法适用性的基本假设——水平均匀和平坦的条件,因此分析是基于局部相似性假设进行的。将作为局部稳定性函数的缩放标准偏差与先前来自水平均匀平坦地形的研究进行比较,水平不均匀平坦地形、弱不均匀平坦地形以及复杂地形。作为参考,使用来自荷兰Cabauw试验场弱不均匀平坦地形的湍流数据评估不稳定和稳定条件的相似关系,并使用与i-Box数据相同的后处理方法进行评估。注意到与参考曲线以及 i-Box 站点之间的显着差异,特别是对于来自具有陡坡的 i-Box 站点的数据。这些差异涉及最佳拟合曲线的斜率和幅度,说明了任何相似理论的位置依赖性。不稳定和稳定条件的相似关系使用来自荷兰 Cabauw 试验场弱不均匀平坦地形的湍流数据进行评估,并使用与 i-Box 数据相同的后处理方法进行评估。注意到与参考曲线以及 i-Box 站点之间的显着差异,特别是对于来自具有陡坡的 i-Box 站点的数据。这些差异涉及最佳拟合曲线的斜率和幅度,说明了任何相似理论的位置依赖性。不稳定和稳定条件的相似关系使用来自荷兰 Cabauw 试验场弱不均匀平坦地形的湍流数据进行评估,并使用与 i-Box 数据相同的后处理方法进行评估。注意到与参考曲线以及 i-Box 站点之间的显着差异,特别是对于来自具有陡坡的 i-Box 站点的数据。这些差异涉及最佳拟合曲线的斜率和幅度,说明了任何相似理论的位置依赖性。特别是对于来自陡坡 i-Box 站点的数据。这些差异涉及最佳拟合曲线的斜率和幅度,说明了任何相似理论的位置依赖性。特别是对于来自陡坡 i-Box 站点的数据。这些差异涉及最佳拟合曲线的斜率和幅度,说明了任何相似理论的位置依赖性。
更新日期:2018-06-14
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