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首页> 外文期刊>Journal of Applied Meteorology and Climatology >Properties of the Wind Field within the Oklahoma City Park Avenue Street Canyon. Part I: Mean Flow and Turbulence Statistics
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Properties of the Wind Field within the Oklahoma City Park Avenue Street Canyon. Part I: Mean Flow and Turbulence Statistics

机译：俄克拉何马城公园大道大街峡谷内风场的属性。第一部分：平均流量和湍流统计

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摘要

Velocity data were obtained from sonic anemometer measurements within an east-west-running street canyon located in the urban core of Oklahoma City, Oklahoma, during the Joint Urban 2003 field campaign. These data were used to explore the directionaldependence of the mean flow and turbulence within a real-world street canyon. The along-canyon vortex that is a key characteristic of idealized street canyon studies was not evident in the mean wind data, although the sensor placement was not optimized for the detection of such structures. Instead, surface wind measurements imply that regions of horizontal convergence and divergence exist within the canopy, which are likely caused by taller buildings diverting the winds aloft down into the canopy. The details of these processes appear to be dependent on relatively small perturbations in the prevailing wind direction. Turbulence intensities within the canyon interior appeared to have more dependence on prevailing wind direction than they did in the intersections. Turbulence in the intersections tended to be higher than was observed in the canyon interior. This behavior implies that there are some fundamental differences between the flow structure found in North American-style cities where building heights are typically heterogeneous and that found in European-style cities, which generally have more homogeneous building heights. It is hypothesized that the greater three-dimensionality caused by the heterogeneous building heights increases the ventilation of the urban canopy through mean advective transport as well as enhanced turbulence.
机译：在“联合市区2003”野战期间，从位于俄克拉荷马州俄克拉荷马市市区中心的东西向行驶的街道峡谷内的声速计测量获得速度数据。这些数据被用来探索真实世界街道峡谷内平均流量和湍流的方向依赖性。尽管没有针对检测这种结构而对传感器位置进行了优化，但沿路峡谷涡流却是理想化街道峡谷研究的关键特征，在平均风速数据中并不明显。取而代之的是，地面风的测量结果表明顶篷内存在水平会聚和发散区域，这可能是由于较高的建筑物将高空风向高处转移到顶篷中引起的。这些过程的细节似乎取决于在主导风向上相对较小的扰动。与交叉口相比，峡谷内部的湍流强度似乎对主导风向的依赖性更大。相交处的湍流往往高于峡谷内部的湍流。这种现象表明，在北美风格的城市（通常建筑物高度通常是异类的）中发现的流量结构与欧洲风格的城市（通常具有更高的建筑物高度）中的流量结构之间存在一些根本差异。假设由异质建筑高度引起的更大三维空间通过平均对流运输以及湍流增强而增加了城市冠层的通风。

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