Roughness Lengths for Momentum and Heat Derived from Outdoor Urban Scale Models
Roughness Lengths for Momentum and Heat Derived from Outdoor Urban Scale Models
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DOI：
10.1175/jam2500.1
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发表时间：
2007-07
影响因子：
3
通讯作者：
M. Kanda;M. Kanega;T. Kawai;R. Moriwaki;H. Sugawara
中科院分区：
文献类型：
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作者：
M. Kanda;M. Kanega;T. Kawai;R. Moriwaki;H. Sugawara
利用综合室外尺度模型（COSMO）的城市气候实验结果估算动量和热量的粗糙度长度。采用两种不同的物理尺度模型研究粗糙度长度的尺度依赖性；大比例尺模型包括1.5米混凝土立方体的排列阵列，小比例尺模型具有几何上相似的0.15米混凝土立方体阵列。只考虑来自不稳定边界层的湍流数据。动量相对于障碍物高度的粗糙度长度与风向有关，但尺度相关性不明显。估计值与传统的形态计量关系很好地吻合。热粗糙度长度相对于障碍物高度的对数取决于尺度，但对风向不敏感。利用COSMO数据成功地回归了动量与热的粗糙度长度的对数比κB−1与动量与热的粗糙度长度的对数比Re*之间的理论关系。
Abstract Urban climate experimental results from the Comprehensive Outdoor Scale Model (COSMO) were used to estimate roughness lengths for momentum and heat. Two different physical scale models were used to investigate the scale dependence of the roughness lengths; the large scale model included an aligned array of 1.5-m concrete cubes, and the small scale model had a geometrically similar array of 0.15-m concrete cubes. Only turbulent data from the unstable boundary layers were considered. The roughness length for momentum relative to the obstacle height was dependent on wind direction, but the scale dependence was not evident. Estimated values agreed well with a conventional morphometric relationship. The logarithm of the roughness length for heat relative to the obstacle height depended on the scale but was insensitive to wind direction. COSMO data were used successfully to regress a theoretical relationship between κB−1, the logarithmic ratio of roughness length for momentum to heat, and Re*, the roug...