Wind tunnel measurements of concentration fluctuations in an urban street canyon
Wind tunnel measurements of concentration fluctuations in an urban street canyon
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DOI：
10.1016/s1352-2310(99)00138-7
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发表时间：
1999-10-01
影响因子：
5
通讯作者：
Schatzmann, M
中科院分区：
文献类型：
--
作者：
Pavageau, M;Schatzmann, M
进行了风洞研究，以检查在城市粗糙的峡谷中街道水平上示踪气体稳定释放所形成的浓度场的一些湍流特征和统计特性。实验是在接近的风向垂直于街道轴线且街道宽度与建筑物高度的长宽比等于1的情况下进行的。在测试街道横截面及以上横截面内的 70 个点记录了浓度时间序列。计算平均浓度、方差和相关湍流量，以及包括分位数在内的其他统计量。还检查了浓度谱和自相关函数。这里重点关注关于平均浓度和浓度波动方差的结果。本文的主要目的是提出本研究中采用的实验方法的潜在好处。通过一个简单且已被广泛研究的配置，旨在展示这种方法如何出于建模目的帮助提高我们对建筑区域汽车尾气污染扩散机制的理解，并通过进一步的测量，如何帮助制定选址监测网络的规范。 (C) 1999 Elsevier Science Ltd. 保留所有权利。
A wind tunnel study was performed to examine some turbulent characteristics and statistical properties of the concentration field developing from the steady release of a tracer gas at street level in a canyon amidst urban roughness. The experiment was conducted with the approaching wind direction perpendicular to the street axis and, with a street width to building height aspect ratio equal to one. Concentration time series were recorded at 70 points within the test street cross-section and above. Mean concentrations, variances and related turbulent quantities, as well as other statistical quantities including quantiles were computed. Concentration spectra and autocorrelation functions were also examined. The emphasis is put here on the results concerning mean concentrations and the variance of concentration fluctuations. The main objective of this paper is to put forward potential benefits of the experimental approach taken in this study. Through a simple and already widely studied configuration it is aimed to show how, for modelling purposes, this approach can help improving our understanding of the mechanisms of dipersion of pollution from car exhausts in built-up areas and, with further measurements, how it could assist in drawing specifications for siting monitoring networks. (C) 1999 Elsevier Science Ltd. All rights reserved.