Lagrangian Coherent Structure Analysis of Terminal Winds: Three-Dimensionality, Intramodel Variations, and Flight Analyses
Lagrangian Coherent Structure Analysis of Terminal Winds: Three-Dimensionality, Intramodel Variations, and Flight Analyses
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末端风的拉格朗日相干结构分析：三维、模型内变化和飞行分析
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
P. Chan
中科院分区：
文献类型：
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作者：
B. Knutson;Wenbo Tang;P. Chan
我们研究了香港国际机场附近的三维拉格朗日相干结构(LCS)，并与以前的二维LCS分析的发展有关。比较了三种独立模型的LCS，并与二维相干多普勒光探测和测距(LIDAR)数据进行了对比。添加垂直于激光雷达扫描锥的速度信息有助于固化以前研究得出的流动结构；模型之间的对比揭示了模型内的变异性；与飞行数据的比较根据拉格朗日分析评估了模型之间的性能。我们发现，虽然这三个模型和LIDAR确实恢复了着陆飞机(沿着陆轨迹)经历的风切变的相似特征，但它们在整个区域的拉格朗日特征非常不同-每个数值模式的一部分捕捉到了某些特征，这些特征类似于从基于观测的独立2D LIDAR分析中提取的特征。
We present a study of three-dimensional Lagrangian coherent structures (LCS) near the Hong Kong International Airport and relate to previous developments of two-dimensional (2D) LCS analyses. The LCS are contrasted among three independent models and against 2D coherent Doppler light detection and ranging (LIDAR) data. Addition of the velocity information perpendicular to the LIDAR scanning cone helps solidify flow structures inferred from previous studies; contrast among models reveals the intramodel variability; and comparison with flight data evaluates the performance among models in terms of Lagrangian analyses. We find that, while the three models and the LIDAR do recover similar features of the windshear experienced by a landing aircraft (along the landing trajectory), their Lagrangian signatures over the entire domain are quite different—a portion of each numerical model captures certain features resembling those LCS extracted from independent 2D LIDAR analyses based on observations.