Joint probability analysis of momentum and heat fluxes at a deciduous forest
Joint probability analysis of momentum and heat fluxes at a deciduous forest
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落叶林动量和热通量的联合概率分析
DOI：
10.1007/bf00122091
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发表时间：
1990
影响因子：
4.3
通讯作者：
R. Shaw
中科院分区：
文献类型：
--
作者：
T. Maitani;R. Shaw
动量和标量的湍流输运过程通过联合概率分布分析使用观测到的数据在一个落叶林中和上面检查。利用Tukey方法分析了频域输运过程的特征。结果证实，在高大的植物冠层内部和顶部普遍存在扫掠现象，并且下降气流对动量和标量的垂直输送更有效。另一方面，上升气流在白天的垂直输送中变得更有效，高度大约是树顶高度的两倍。结果表明，在森林内部，扫波现象在较宽的频率范围内普遍存在，而在森林之上，弹射现象的流行仅限于低频。再次指出，植物冠层在横扫-喷射循环以及湍流运输过程中起着重要作用。
Turbulent transport processes for momentum and scalar quantities are examined by a joint probability distribution analysis using data observed within and above a deciduous forest. Characteristics of transport processes in the frequency domain were also analyzed using Tukey's procedure. The results confirm that sweep phenomena prevail within and at the top of a tall plant canopy and that downdrafts are more effective for vertical transport of momentum and scalar quantities. On the other hand, updrafts become more efficient for vertical transport in the daytime at levels about twice treetop height. The results show that within the forest, the sweep phenomenon prevails over a wide frequency range, while above the forest, prevalence of the ejection phenomenon is limited to low frequencies. It is again noted that the plant canopy plays an important role in the sweep-ejection cycle as well as in turbulent transport processes.