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首页> 外文期刊>Meteorology and Atmospheric Physics >Validating the turbulence parameterization schemes of a numerical model using eddy dissipation rate and turbulent kinetic energy measurements in terrain-disrupted airflow
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Validating the turbulence parameterization schemes of a numerical model using eddy dissipation rate and turbulent kinetic energy measurements in terrain-disrupted airflow

机译：使用涡流耗散率和地形扰动气流中的湍动能测量结果验证数值模型的湍流参数化方案

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A number of turbulence parameterization schemes are available in the latest version (6.0) of the Regional Atmospheric Modelling System (RAMS). Chan in Meteorol Atmos Phys 103:145–157, (2009), studied the performance of these schemes by simulating the eddy dissipation rate (EDR) distribution in the vicinity of the Hong Kong International Airport (HKIA) and comparing with the EDR measurements of remote-sensing instruments at the airport. For the e-l (turbulent kinetic energy − mixing length) scheme considered in that study, the asymptotic mixing length was assumed to be a constant. This assumption is changed in the present paper, a variable asymptotic mixing length is chosen and simulations of EDR fields are repeated for terrain-disrupted airflow in the vicinity of HKIA. It is found that, with a variable asymptotic mixing length, the performance of the e-l scheme is greatly improved. With suitable choice of the empirical constants in the turbulence closure, the accuracy of the EDR profile (in comparison with LIDAR and wind profiler measurements) is found to be comparable with that predicted by the Deardorff scheme. A study on the sensitivity of the simulation results to these empirical constants has also been performed. Moreover, as a follow-up of the previous study of Chan in Meteorol Atmos Phys 103:145–157, (2009), case studies have been conducted on the following issues of the model simulation of turbulence for aviation application: (a) the effect of vertical gridding on the simulation results, (b) possibility of false alarm (such as over-forecasting of EDR value) in light turbulence cases, and (c) the performance in the simulation of other turbulence intensity metric for aviation purpose, e.g. TKE.
机译：在区域大气建模系统（RAMS）的最新版本（6.0）中提供了许多湍流参数化方案。 Chan在Meteorol Atmos Phys 103：145-157，（2009）中，通过模拟香港国际机场（HKIA）附近的涡流散逸率（EDR）分布，并与EDR测量值进行比较，研究了这些方案的性能。机场的遥感仪器。对于该研究中考虑的e-1（湍动能-混合长度）方案，假定渐近混合长度为常数。本文改变了这一假设，选择了可变的渐近混合长度，并对香港国际机场附近的地形扰乱气流进行了EDR场的模拟。发现，随着可变渐近混合长度，e-1方案的性能大大提高。通过适当选择湍流闭合中的经验常数，发现EDR轮廓的精度（与LIDAR和风廓线仪的测量结果相比）与Deardorff方案预测的精度相当。还对模拟结果对这些经验常数的敏感性进行了研究。此外，作为对Chan在Meteorol Atmos Phys 103：145-157，（2009）中先前研究的后续研究，已针对航空应用湍流模型仿真的以下问题进行了案例研究：（a）垂直网格对模拟结果的影响；（b）在轻湍流情况下可能会产生误报（例如，EDR值的过度预测），以及（c）在模拟其他用于航空目的的湍流强度度量时的性能，例如TKE。

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